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Loans And Allowance For Credit Losses (Narrative) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
d
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loans And Allowance For Credit Losses [Line Items]        
Loans Credit Quality Outstanding, Commercial And Industrial $ 14,758   $ 14,513  
Impaired Financing Receivable, Average Recorded Investment 250 $ 379    
Impaired Financing Receivable, Interest Income, Accrual Method 1 8    
Impaired Financing Receivable, Recorded Investment 238   261  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 9   9  
Loans Modified As Troubled Debt Restructurings Loans 73 111    
Unfunded Lending Commitments on Troubled Debt Restructuring 11      
Loans and Leases Receivable, Gross 47,606   46,714  
Financing Receivable, Recorded Investment, Current 47,360   46,539  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 5 2    
Unearned income and fees, net of related costs 51   50  
Land Development Loans 231   237  
Loans at carrying value pledged as collateral for current and potential borrowings 23,000   23,000  
Payments for Origination and Purchases of Loans Held-for-sale 93 165    
Principal Balance of Loans Sold, Serviced Loans 2,200      
Loans and Leases Receivable, Gain (Loss) on Sales, Net 2 3    
Principle amount of loans held for sale sold $ 118 106    
Minimum number of days past due for nonaccrual status | d 90      
Recorded investment in TDR loans modified with interest rates below market $ 80   88  
Provision for Loan and Lease Losses 2 (40)    
Provision for Unfunded Lending Commitments (decrease) 2 (7)    
Other Real Estate, Foreclosed Assets, and Repossessed Assets 1   2  
Other Real Estate, In Process of Forecloseing Assets 9   10  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 167   89  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 79   86  
Financing Receivable, Recorded Investment, Past Due 246   175  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 8   10  
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 138   145  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 488   486  
Loans and Leases Receivable, Allowance 497 473 495 $ 518
Financing Receivable, Individually Evaluated for Impairment 268   291  
Financing Receivable, Collectively Evaluated for Impairment 47,338   46,423  
Loan Credit Quality Outstanding, Leasing 312   327  
Commercial Lending Loans - Owner Occupied 7,754   7,661  
Loans Credit Quality Outstanding, Municipal 1,774   1,661  
Land Development Loans, Loans Receivable Commercial Construction and Land Development 2,343   2,186  
Commercial Real Estate Term Loans 9,187   8,939  
Loans Credit Quality Outstanding, Commercial Real Estate 11,530   11,125  
Loans Credit Quality Outstanding, Home Equity Credit Line 2,884   2,937  
Loans Credit Quality Outstanding, 1-4 Family Residential 7,294   7,176  
Loans Credit Quality Outstanding, Construction and Other 636   643  
Loans Credit Quality Outstanding, Bankcard 489   491  
Loans Credit Quality Outstanding, Other 175   180  
Impaired Financing Receivable, Related Allowance 8   8  
Impaired Financing Receivable, Unpaid Principal Balance 275   310  
Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 1 1    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment 1   1  
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1  
Impaired Financing Receivable, Related Allowance 0   0  
Impaired Financing Receivable, Unpaid Principal Balance 1   1  
Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 2 2    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment 2   1  
Financing Receivable, Recorded Investment, Nonaccrual Status 2   0  
Impaired Financing Receivable, Related Allowance 0   0  
Impaired Financing Receivable, Unpaid Principal Balance 2   1  
One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 55 55    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment 53   57  
Financing Receivable, Recorded Investment, Nonaccrual Status 45   42  
Impaired Financing Receivable, Related Allowance 2   2  
Impaired Financing Receivable, Unpaid Principal Balance 63   69  
Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 79      
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 1    
Financing Receivable, Recorded Investment, Nonaccrual Status 72   82  
Impaired Financing Receivable, Related Allowance 5   4  
Impaired Financing Receivable, Unpaid Principal Balance 99   112  
Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 14 20    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment 15   14  
Financing Receivable, Recorded Investment, Nonaccrual Status 11   13  
Impaired Financing Receivable, Related Allowance 0   0  
Impaired Financing Receivable, Unpaid Principal Balance 15   15  
Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 71 77    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment 70   72  
Financing Receivable, Recorded Investment, Nonaccrual Status 58   56  
Impaired Financing Receivable, Related Allowance 2   2  
Impaired Financing Receivable, Unpaid Principal Balance 80   85  
Commercial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans Credit Quality Outstanding, Commercial And Industrial 14,758   14,513  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 6   6  
Loans and Leases Receivable, Gross $ 24,598   24,162  
Subsequent payment default period, number of days | d 90      
Provision for Loan and Lease Losses $ (1) (40)    
Provision for Unfunded Lending Commitments (decrease) 2 (8)    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 322   325  
Loans and Leases Receivable, Allowance 328 329 331 371
Financing Receivable, Individually Evaluated for Impairment     164  
Financing Receivable, Collectively Evaluated for Impairment     23,998  
Loan Credit Quality Outstanding, Leasing 312   327  
Commercial Lending Loans - Owner Occupied 7,754   7,661  
Loans Credit Quality Outstanding, Municipal 1,774   1,661  
Loans and Leases Receivable, before Fees, Gross 24,598   24,162  
Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 0 0    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment 0   0  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 2   2  
Loans and Leases Receivable, Gross $ 11,478   11,427  
Subsequent payment default period, number of days | d 60      
Provision for Loan and Lease Losses $ 2 1    
Provision for Unfunded Lending Commitments (decrease) 0 0    
Financing Receivable, Recorded Investment, Nonaccrual Status 0   0  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 54   52  
Loans and Leases Receivable, Allowance 56 40 54 44
Financing Receivable, Individually Evaluated for Impairment     72  
Financing Receivable, Collectively Evaluated for Impairment     11,355  
Loans and Leases Receivable, before Fees, Gross 11,478   11,427  
Loans Credit Quality Outstanding, Home Equity Credit Line 2,884   2,937  
Loans Credit Quality Outstanding, 1-4 Family Residential 7,294   7,176  
Loans Credit Quality Outstanding, Construction and Other 636   643  
Loans Credit Quality Outstanding, Bankcard 489   491  
Loans Credit Quality Outstanding, Other 175   180  
Impaired Financing Receivable, Related Allowance 0   0  
Impaired Financing Receivable, Unpaid Principal Balance 0   0  
Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 35 62    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment 35   40  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment     1  
Loans and Leases Receivable, Gross 11,530   11,125  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 2 0    
Financing Receivable, Recorded Investment, Nonaccrual Status 33   38  
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment     109  
Loans and Leases Receivable, Allowance 113   110  
Financing Receivable, Individually Evaluated for Impairment     55  
Financing Receivable, Collectively Evaluated for Impairment     11,070  
Impaired Financing Receivable, Related Allowance 0   0  
Impaired Financing Receivable, Unpaid Principal Balance 39   45  
Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 0 5    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment     0  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 1      
Provision for Loan and Lease Losses 1 (1)    
Provision for Unfunded Lending Commitments (decrease) 0 1    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 112      
Loans and Leases Receivable, Allowance 113 104 110 $ 103
Land Development Loans, Loans Receivable Commercial Construction and Land Development     2,186  
Commercial Real Estate Term Loans 9,187   8,939  
Loans Credit Quality Outstanding, Commercial Real Estate 11,530   11,125  
Construction and Land Development [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Nonaccrual Status 1   0  
Land Development Loans, Loans Receivable Commercial Construction and Land Development 2,343      
Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 0      
Impaired Financing Receivable, Related Allowance 0   0  
Impaired Financing Receivable, Unpaid Principal Balance 0   1  
Bankcard And Other Revolving Plans [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Nonaccrual Status 0   1  
Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 60 91    
Impaired Financing Receivable, Interest Income, Accrual Method 0 8    
Impaired Financing Receivable, Recorded Investment 53   60  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 1    
Financing Receivable, Recorded Investment, Nonaccrual Status 69   67  
Impaired Financing Receivable, Related Allowance 1   2  
Impaired Financing Receivable, Unpaid Principal Balance 56   67  
Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Average Recorded Investment 35 57    
Impaired Financing Receivable, Interest Income, Accrual Method 0 0    
Impaired Financing Receivable, Recorded Investment 35   40  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 2 0    
Financing Receivable, Recorded Investment, Nonaccrual Status 32   38  
Impaired Financing Receivable, Related Allowance 0   0  
Impaired Financing Receivable, Unpaid Principal Balance 39   44  
Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 11,478   11,427  
Financing Receivable, Recorded Investment, Current 11,430   11,378  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 22   23  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 26   26  
Financing Receivable, Recorded Investment, Past Due 48   49  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1   2  
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 24   23  
Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 175   180  
Financing Receivable, Recorded Investment, Current     179  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     1  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     0  
Financing Receivable, Recorded Investment, Past Due 1   1  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     0  
Consumer Portfolio Segment [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 174      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 1      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0  
Finance Leases Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 312   327  
Financing Receivable, Recorded Investment, Current     325  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     1  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     1  
Financing Receivable, Recorded Investment, Past Due 1   2  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     0  
Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 7,754   7,661  
Financing Receivable, Recorded Investment, Current     7,621  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     23  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     17  
Financing Receivable, Recorded Investment, Past Due 52   40  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     3  
Owner Occupied [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 7,702      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 33      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 19      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 45   48  
Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 1,774   1,661  
Financing Receivable, Recorded Investment, Current     1,661  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     0  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     0  
Financing Receivable, Recorded Investment, Past Due 0   0  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     0  
Municipal [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 1,774      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 1   1  
Commercial Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 24,598   24,162  
Financing Receivable, Recorded Investment, Current 24,433   24,052  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 119   61  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 46   49  
Financing Receivable, Recorded Investment, Past Due 165   110  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 5   7  
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 90   96  
Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 2,343   2,186  
Financing Receivable, Recorded Investment, Current     2,185  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     1  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     0  
Financing Receivable, Recorded Investment, Past Due 10   1  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     0  
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 2,333      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 9      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 1      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0  
Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 9,187   8,939  
Financing Receivable, Recorded Investment, Current     8,924  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     4  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     11  
Financing Receivable, Recorded Investment, Past Due 23   15  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     1  
Term [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 9,164      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 17      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 6      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 24   26  
Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 11,530   11,125  
Financing Receivable, Recorded Investment, Current 11,497   11,109  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 26   5  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 7   11  
Financing Receivable, Recorded Investment, Past Due 33   16  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 2   1  
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 24   26  
Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 2,884   2,937  
Financing Receivable, Recorded Investment, Current     2,927  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     4  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     6  
Financing Receivable, Recorded Investment, Past Due 9   10  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     0  
Home Equity Line of Credit [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 2,875      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 5      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 4      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 5   4  
One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 7,294   7,176  
Financing Receivable, Recorded Investment, Current     7,143  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     15  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     18  
Financing Receivable, Recorded Investment, Past Due 34   33  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     0  
One Through Four Family Residential [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 7,260      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 13      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 21      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 17   19  
Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 636   643  
Financing Receivable, Recorded Investment, Current     642  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     1  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     0  
Financing Receivable, Recorded Investment, Past Due 0   1  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     0  
Construction And Other Consumer Real Estate [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 636      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 2   0  
Revolving Credit Facility [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 489   491  
Financing Receivable, Recorded Investment, Current     487  
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due     2  
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due     2  
Financing Receivable, Recorded Investment, Past Due 4   4  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing     2  
Revolving Credit Facility [Member] | Bankcard And Other Revolving Plans [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Recorded Investment, Current 485      
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 3      
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 1      
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1      
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 0   0  
Accruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 98   112  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0    
Accruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Accruing [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Accruing [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 35   39  
Accruing [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 26   28  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0    
Accruing [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 12   12  
Accruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 48   52  
Accruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 9   11  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0      
Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Accruing [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 15   21  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0    
Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 9   11  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0    
Nonaccruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 174   202  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 5 2    
Nonaccruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Nonaccruing [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 9   9  
Nonaccruing [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 32   45  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 1    
Nonaccruing [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Nonaccruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 76   90  
Nonaccruing [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 10   10  
Nonaccruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 20   20  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 2      
Nonaccruing [Member] | Construction and Land Development [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   0    
Nonaccruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 13   14  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 1    
Nonaccruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 20   20  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 2 $ 0    
Outstanding Loan Balances [Member] | Commercial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Individually Evaluated for Impairment 148      
Financing Receivable, Collectively Evaluated for Impairment 24,450      
Outstanding Loan Balances [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Individually Evaluated for Impairment 70      
Financing Receivable, Collectively Evaluated for Impairment 11,408      
Outstanding Loan Balances [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Individually Evaluated for Impairment 50      
Financing Receivable, Collectively Evaluated for Impairment 11,480      
Pass [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 46,360   45,589  
Pass [Member] | Commercial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans Credit Quality Outstanding, Commercial And Industrial 14,047   13,891  
Loan Credit Quality Outstanding, Leasing 299   313  
Commercial Lending Loans - Owner Occupied 7,448   7,369  
Loans Credit Quality Outstanding, Municipal 1,745   1,632  
Loans and Leases Receivable, before Fees, Gross 23,539   23,205  
Pass [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, before Fees, Gross 11,407   11,357  
Loans Credit Quality Outstanding, Home Equity Credit Line 2,868   2,920  
Loans Credit Quality Outstanding, 1-4 Family Residential 7,245   7,129  
Loans Credit Quality Outstanding, Construction and Other 633   641  
Loans Credit Quality Outstanding, Bankcard 487   488  
Loans Credit Quality Outstanding, Other 174   179  
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Land Development Loans, Loans Receivable Commercial Construction and Land Development     2,174  
Commercial Real Estate Term Loans 9,080   8,853  
Loans Credit Quality Outstanding, Commercial Real Estate 11,414   11,027  
Pass [Member] | Construction and Land Development [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Land Development Loans, Loans Receivable Commercial Construction and Land Development 2,334      
Special Mention [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 517   427  
Special Mention [Member] | Commercial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans Credit Quality Outstanding, Commercial And Industrial 389   322  
Loan Credit Quality Outstanding, Leasing 10   10  
Commercial Lending Loans - Owner Occupied 82   72  
Loans Credit Quality Outstanding, Municipal 2   2  
Loans and Leases Receivable, before Fees, Gross 483   406  
Special Mention [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, before Fees, Gross 0   0  
Loans Credit Quality Outstanding, Home Equity Credit Line 0   0  
Loans Credit Quality Outstanding, 1-4 Family Residential 0   0  
Loans Credit Quality Outstanding, Construction and Other 0   0  
Loans Credit Quality Outstanding, Bankcard 0   0  
Loans Credit Quality Outstanding, Other 0   0  
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Land Development Loans, Loans Receivable Commercial Construction and Land Development     11  
Commercial Real Estate Term Loans 34   10  
Loans Credit Quality Outstanding, Commercial Real Estate 34   21  
Special Mention [Member] | Construction and Land Development [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Land Development Loans, Loans Receivable Commercial Construction and Land Development 0      
Substandard [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 729   698  
Substandard [Member] | Commercial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans Credit Quality Outstanding, Commercial And Industrial 322   300  
Loan Credit Quality Outstanding, Leasing 3   4  
Commercial Lending Loans - Owner Occupied 224   220  
Loans Credit Quality Outstanding, Municipal 27   27  
Loans and Leases Receivable, before Fees, Gross 576   551  
Substandard [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, before Fees, Gross 71   70  
Loans Credit Quality Outstanding, Home Equity Credit Line 16   17  
Loans Credit Quality Outstanding, 1-4 Family Residential 49   47  
Loans Credit Quality Outstanding, Construction and Other 3   2  
Loans Credit Quality Outstanding, Bankcard 2   3  
Loans Credit Quality Outstanding, Other 1   1  
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Land Development Loans, Loans Receivable Commercial Construction and Land Development     1  
Commercial Real Estate Term Loans 73   76  
Loans Credit Quality Outstanding, Commercial Real Estate 82   77  
Substandard [Member] | Construction and Land Development [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Land Development Loans, Loans Receivable Commercial Construction and Land Development 9      
Doubtful [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 0   0  
Doubtful [Member] | Commercial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans Credit Quality Outstanding, Commercial And Industrial 0   0  
Loan Credit Quality Outstanding, Leasing 0   0  
Commercial Lending Loans - Owner Occupied 0   0  
Loans Credit Quality Outstanding, Municipal 0   0  
Loans and Leases Receivable, before Fees, Gross 0   0  
Doubtful [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, before Fees, Gross 0   0  
Loans Credit Quality Outstanding, Home Equity Credit Line 0   0  
Loans Credit Quality Outstanding, 1-4 Family Residential 0   0  
Loans Credit Quality Outstanding, Construction and Other 0   0  
Loans Credit Quality Outstanding, Bankcard 0   0  
Loans Credit Quality Outstanding, Other 0   0  
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Land Development Loans, Loans Receivable Commercial Construction and Land Development     0  
Commercial Real Estate Term Loans 0   0  
Loans Credit Quality Outstanding, Commercial Real Estate 0   0  
Doubtful [Member] | Construction and Land Development [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Land Development Loans, Loans Receivable Commercial Construction and Land Development 0      
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, Gross 497   495  
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, before Fees, Gross 56      
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, before Fees, Gross 328   331  
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans and Leases Receivable, before Fees, Gross     54  
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Loans Credit Quality Outstanding, Commercial Real Estate 113   110  
Impaired Financing Receivable Recorded Investment With No Allowance [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 153   166  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 1   1  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 0   1  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 30   32  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 35   52  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 12   12  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 42   45  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 0   0  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 33   37  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 0   0  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 42   31  
Impaired Financing Receivable Recorded Investment With No Allowance [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 33   37  
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 0      
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 2      
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 23      
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 3      
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 0      
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 0      
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 11      
Impaired Financing Receivable Recorded Investment With an Allowance [Member] [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 2      
Impaired Financing Receivable Related Allowance [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 85   95  
Impaired Financing Receivable Related Allowance [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment     0  
Impaired Financing Receivable Related Allowance [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment     0  
Impaired Financing Receivable Related Allowance [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment     25  
Impaired Financing Receivable Related Allowance [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 44   36  
Impaired Financing Receivable Related Allowance [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment     2  
Impaired Financing Receivable Related Allowance [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 28   27  
Impaired Financing Receivable Related Allowance [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment     0  
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment 2   3  
Impaired Financing Receivable Related Allowance [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment     0  
Impaired Financing Receivable Related Allowance [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment     29  
Impaired Financing Receivable Related Allowance [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Impaired Financing Receivable, Recorded Investment     3  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 18   18  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 1   1  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 0   0  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     2  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 25   45  
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 7   27  
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 1   1  
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 3   14  
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2]     2  
Other Recorded Investment Resulting From Following Modification [Member] | Nonaccruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2]     14  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 [2]   0  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1 [2]   1  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 14 [2]   15  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 [2]   0  
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 0      
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 3      
Other Recorded Investment Resulting From Following Modification [Member] | Accruing [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [2] 0      
Multiple Modification Types [Member] | Accruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 45   59  
Multiple Modification Types [Member] | Accruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 27   32  
Multiple Modification Types [Member] | Accruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 5   6  
Multiple Modification Types [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Multiple Modification Types [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     14  
Multiple Modification Types [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     6  
Multiple Modification Types [Member] | Nonaccruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 95   100  
Multiple Modification Types [Member] | Nonaccruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     1  
Multiple Modification Types [Member] | Nonaccruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 50   41  
Multiple Modification Types [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 7   7  
Multiple Modification Types [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 12   1  
Multiple Modification Types [Member] | Nonaccruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3]     5  
Multiple Modification Types [Member] | Nonaccruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3]     1  
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0 [3]   1  
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 25 [3]   28  
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 6 [3]   7  
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2 [3]   3  
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 0      
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 7      
Multiple Modification Types [Member] | Accruing [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment [3] 5      
Interest Rate Below Market [Member] | Accruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 8   8  
Interest Rate Below Market [Member] | Accruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Interest Rate Below Market [Member] | Accruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   2  
Interest Rate Below Market [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Interest Rate Below Market [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     3  
Interest Rate Below Market [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     2  
Interest Rate Below Market [Member] | Nonaccruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 18   18  
Interest Rate Below Market [Member] | Nonaccruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Interest Rate Below Market [Member] | Nonaccruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 10   10  
Interest Rate Below Market [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Interest Rate Below Market [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 3   3  
Interest Rate Below Market [Member] | Nonaccruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     6  
Interest Rate Below Market [Member] | Nonaccruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     3  
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2   2  
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 4      
Interest Rate Below Market [Member] | Accruing [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1      
Maturity Or Team Extension [Member] | Accruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 10   11  
Maturity Or Team Extension [Member] | Accruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 3   3  
Maturity Or Team Extension [Member] | Accruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2   2  
Maturity Or Team Extension [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Maturity Or Team Extension [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     2  
Maturity Or Team Extension [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     2  
Maturity Or Team Extension [Member] | Nonaccruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 14   17  
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 4   6  
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Maturity Or Team Extension [Member] | Nonaccruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   0  
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   2  
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 4   4  
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1      
Maturity Or Team Extension [Member] | Accruing [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2      
Principal Forgiveness [Member] | Accruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 15   14  
Principal Forgiveness [Member] | Accruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 15   14  
Principal Forgiveness [Member] | Accruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Principal Forgiveness [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Principal Forgiveness [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Principal Forgiveness [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Principal Forgiveness [Member] | Nonaccruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 17   16  
Principal Forgiveness [Member] | Nonaccruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Principal Forgiveness [Member] | Nonaccruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2   2  
Principal Forgiveness [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2   2  
Principal Forgiveness [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Principal Forgiveness [Member] | Nonaccruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Principal Forgiveness [Member] | Nonaccruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 6   6  
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 9   8  
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Principal Forgiveness [Member] | Accruing [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Payment Deferral [Member] | Accruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2   2  
Payment Deferral [Member] | Accruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Payment Deferral [Member] | Accruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Payment Deferral [Member] | Accruing [Member] | Commercial Real Estate Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Payment Deferral [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Payment Deferral [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     1  
Payment Deferral [Member] | Nonaccruing [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 5   6  
Payment Deferral [Member] | Nonaccruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     0  
Payment Deferral [Member] | Nonaccruing [Member] | Consumer Loan [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 3   4  
Payment Deferral [Member] | Nonaccruing [Member] | Consumer Portfolio Segment [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Payment Deferral [Member] | Nonaccruing [Member] | Commercial Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 2   2  
Payment Deferral [Member] | Nonaccruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     1  
Payment Deferral [Member] | Nonaccruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment     2  
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Municipal [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Construction And Other Consumer Real Estate [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | One Through Four Family Residential [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 1   1  
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Commercial And Industrial [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   0  
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Home Equity Line of Credit [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0   $ 0  
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Commercial Real Estate Construction [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Owner Occupied [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment 0      
Payment Deferral [Member] | Accruing [Member] | Accruing [Member] | Term [Member]        
Loans And Allowance For Credit Losses [Line Items]        
Financing Receivable, Modifications, Recorded Investment $ 1      
[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.
[2] 1 Includes TDRs that resulted from other modification types including, but not limited to, a legal judgment awarded on different terms, a bankruptcy plan confirmed on different terms, a settlement that includes the delivery of collateral in exchange for debt reduction, etc.
[3] 2 Includes TDRs that resulted from a combination of any of the previous modification types.