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Loans And Allowance For Credit Losses (Summary Of Selected Information On TDRs That Includes Recorded Investment On An Accruing And Nonaccruing Basis By Loan Class And Modification Type) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 1 $ 3 $ 3 $ 8  
Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 1 2 5  
Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 1 1  
Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 1 3 6  
Term [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 2 0 2  
Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 2 0 2  
Accruing [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 2 0 2  
Recorded investment resulting from the following modification types 90   90   $ 112
Accruing [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0  
Recorded investment resulting from the following modification types 22   22   28
Accruing [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0  
Recorded investment resulting from the following modification types 17   17   21
Accruing [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0  
Recorded investment resulting from the following modification types 39   39   49
Accruing [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 2 0 2  
Recorded investment resulting from the following modification types 7   7   11
Accruing [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 2 0 2  
Recorded investment resulting from the following modification types 7   7   11
Accruing [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 32   32   39
Accruing [Member] | Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   1
Accruing [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 44   44   52
Accruing [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 12   12   12
Accruing [Member] | Interest Rate Below Market [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 7   7   8
Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         3
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 6   6   5
Accruing [Member] | Interest Rate Below Market [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         2
Accruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   2
Accruing [Member] | Interest Rate Below Market [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1   1
Accruing [Member] | Maturity Or Team Extension [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 9   9   11
Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         2
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 4   4   6
Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         2
Accruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2   2   2
Accruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 3   3   3
Accruing [Member] | Principal Forgiveness [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 13   13   14
Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Accruing [Member] | Principal Forgiveness [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Principal Forgiveness [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Accruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 13   13   14
Accruing [Member] | Payment Deferral [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1   2
Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Accruing [Member] | Payment Deferral [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Payment Deferral [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         1
Accruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1   1
Accruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   1
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 16   16   18
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         2
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 15   15   17
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 0   0   0
Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 1   1   1
Accruing [Member] | Multiple Modification Types [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 44   44   59
Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         14
Accruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 14   14   21
Accruing [Member] | Multiple Modification Types [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         6
Accruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 4   4   6
Accruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 26   26   32
Nonaccruing [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 1 3 6  
Recorded investment resulting from the following modification types 182   182   202
Nonaccruing [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 1 2 5  
Recorded investment resulting from the following modification types 52   52   45
Nonaccruing [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 1 1  
Recorded investment resulting from the following modification types 12   12   14
Nonaccruing [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   1
Nonaccruing [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 1 3 6  
Recorded investment resulting from the following modification types 64   64   60
Nonaccruing [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0  
Recorded investment resulting from the following modification types 18   18   20
Nonaccruing [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 $ 0 0 $ 0  
Recorded investment resulting from the following modification types 18   18   20
Nonaccruing [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 8   8   9
Nonaccruing [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 10   10   10
Nonaccruing [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 92   92   90
Nonaccruing [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2   2   1
Nonaccruing [Member] | Interest Rate Below Market [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 14   14   18
Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         6
Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 6   6   7
Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         3
Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1   3
Nonaccruing [Member] | Interest Rate Below Market [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Interest Rate Below Market [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 7   7   10
Nonaccruing [Member] | Maturity Or Team Extension [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 15   15   17
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 6   6   6
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Maturity Or Team Extension [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 6   6   6
Nonaccruing [Member] | Principal Forgiveness [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 16   16   16
Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 3   3   2
Nonaccruing [Member] | Principal Forgiveness [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 3   3   2
Nonaccruing [Member] | Payment Deferral [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 23   23   6
Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         1
Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 22   22   2
Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         2
Nonaccruing [Member] | Payment Deferral [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   2
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Payment Deferral [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 22   22   4
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 22   22   45
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1]         2
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         0
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 1   1   12
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1]         14
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 4   4   14
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 1   1   1
Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 6   6   27
Nonaccruing [Member] | Multiple Modification Types [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 92   92   100
Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2]         5
Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types         1
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 29   29   33
Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2]         1
Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 13   13   1
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 6   6   7
Nonaccruing [Member] | Multiple Modification Types [Member] | Consumer Loan [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 48   48   41
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2   2   2
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 4   4    
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1   1
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Accruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2   2   4
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2   2    
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2   2    
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1   2
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Accruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2   2   1
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 5   5   6
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Accruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 8   8   8
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1    
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   1
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Accruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 11 [1]   11 [1]   15
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 4   4    
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 0   0    
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1 [1]   1 [1]   1
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0 [1]   0 [1]   0
Accruing [Member] | Accruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0 [1]   0 [1]   0
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 7 [2]   7 [2]   7
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 7   7    
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 4   4    
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 24 [2]   24 [2]   28
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0 [2]   0 [2]   1
Accruing [Member] | Accruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2 [2]   2 [2]   3
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   1
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 6   6    
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1    
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Nonaccruing [Member] | Interest Rate Below Market [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 5   5   6
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1    
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Nonaccruing [Member] | Maturity Or Team Extension [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 1   1   1
Nonaccruing [Member] | Nonaccruing [Member] | Principal Forgiveness [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 2   2   1
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 22   22   1
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Nonaccruing [Member] | Payment Deferral [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0   0
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 0   0   10
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 1   1    
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 4   4    
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 1   1   1
Nonaccruing [Member] | Nonaccruing [Member] | Other Recorded Investment Resulting From Following Modification [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [1] 0   0   0
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Commercial And Industrial [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 25   25   27
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Owner Occupied [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 4   4    
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Municipal [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types 0   0    
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Term [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 13   13    
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | One Through Four Family Residential [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] 6   6   7
Nonaccruing [Member] | Nonaccruing [Member] | Multiple Modification Types [Member] | Home Equity Line of Credit [Member]          
Financing Receivable, Modifications [Line Items]          
Recorded investment resulting from the following modification types [2] $ 0   $ 0   $ 0
[1] 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.
[2] 2 Includes TDRs that resulted from a combination of any of the previous modification types.