Loans and Allowances for Credit Losses Loans Part 5 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	$ 21,275	$ 21,275	$ 38,588
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	253	253	2,760
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	890	5,175
Financing Receivable, Modifications, Recorded Investment	44,268	44,268	48,126
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	22,993	22,993	9,538
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Recorded Investment	28,000	28,000	33,000
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	3,502	3,502	168
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	3,502	3,502	168
Consumer [Member] | Indirect Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	0	0	0
Consumer [Member] | Other Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	3,502	3,502	168
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	3,502	3,502	168
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	319	319	2,707
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	54	54	282
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	121	145
Financing Receivable, Modifications, Recorded Investment	4,646	4,646	4,103
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	4,327	4,327	1,396
Residential Mortgage [Member] | Permanent Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	319	319	2,707
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	54	54	282
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	121	145
Financing Receivable, Modifications, Recorded Investment	4,646	4,646	4,103
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	4,327	4,327	1,396
Residential Mortgage [Member] | Residential Mortgage Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	0	0	0
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	18,674	18,674	32,521
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	179	179	2,454
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	769	5,030
Financing Receivable, Modifications, Recorded Investment	30,952	30,952	37,627
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	12,278	12,278	5,106
Commercial Real Estate [Member] | Construction and Land Development [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	13,979	13,979	22,305
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	76	76	1,577
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	769	2,579
Financing Receivable, Modifications, Recorded Investment	18,217	18,217	25,890
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	4,238	4,238	3,585
Commercial Real Estate [Member] | Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	1,070
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	3,618	3,618	1,070
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	3,618	3,618	0
Commercial Real Estate [Member] | Office [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	898	898	1,362
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	215
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	269
Financing Receivable, Modifications, Recorded Investment	3,387	3,387	2,496
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	2,489	2,489	1,134
Commercial Real Estate [Member] | Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	0	0	0
Commercial Real Estate [Member] | Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	0	0	0
Commercial Real Estate [Member] | Other Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	3,797	3,797	7,784
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	103	103	662
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	2,182
Financing Receivable, Modifications, Recorded Investment	5,730	5,730	8,171
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	1,933	1,933	387
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	2,282	2,282	3,360
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	20	20	24
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	5,168	5,168	6,228
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	2,886	2,886	2,868
Commercial [Member] | Energy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	0	0	0
Commercial [Member] | Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	1,319	1,319	1,622
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	2,700	2,700	3,529
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	1,381	1,381	1,907
Commercial [Member] | Wholesale/Retail [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	184	184	778
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	20	20	24
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	1,612	1,612	1,739
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	1,428	1,428	961
Commercial [Member] | Manufacturing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	0	0	0
Commercial [Member] | Healthcare [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	77	77	0
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	77	77	0
Commercial [Member] | Integrated Food Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	0	0	0
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	0	0	0
Commercial [Member] | Other Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled Debt Financing Receivable Modification Not Performing According To Modified Terms	779	779	960
Troubled Debt Restructuring, Loans and Leases Receivable, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0	0
Financing Receivable, Modifications, Recorded Investment	779	779	960
Troubled Debt Financing Receivable Modification Performing According To Modified Terms	$ 0	$ 0	$ 0