Loans and Allowances for Credit Losses Part 5 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	$ 109,754	$ 101,613	$ 106,281
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	45,941	40,832	42,343
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	63,813	60,781	63,938
Troubled Debt Restructuring, Specific allowance	3,404	515	441
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	289	997
Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	54,247	53,671	51,959
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	30,292	27,648	28,959
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	23,955	26,023	23,000
Troubled Debt Restructuring, Specific allowance	3,404	515	441
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	289	997
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	55,507	47,942	54,322
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	15,649	13,184	13,384
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	39,858	34,758	40,938
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Commercial [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	6,152	4,778	3,632
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	1,412	2,373	1,114
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	4,740	2,405	2,518
Troubled Debt Restructuring, Specific allowance	3,157	305	246
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Energy [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Services [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	1,811	2,441	2,235
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	761	1,195	852
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,050	1,246	1,383
Troubled Debt Restructuring, Specific allowance	148	292	237
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Wholesale/retail [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	207	1,481	235
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	73	1,015	89
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	134	466	146
Troubled Debt Restructuring, Specific allowance	9	13	9
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Manufacturing [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	3,384	0	391
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	384	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	3,000	0	391
Troubled Debt Restructuring, Specific allowance	3,000	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Healthcare [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Integrated food services [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Other commercial and industrial [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	750	856	771
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	194	163	173
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	556	693	598
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Commercial Real Estate [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	24,070	26,764	24,577
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	11,548	10,002	11,342
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	12,522	16,762	13,235
Troubled Debt Restructuring, Specific allowance	162	76	107
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	67	627
Residential construction and land development [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	10,083	12,770	10,148
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	1,839	2,479	1,444
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	8,244	10,291	8,704
Troubled Debt Restructuring, Specific allowance	162	76	107
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Retail [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	4,140	6,139	4,359
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	2,584	2,359	3,141
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,556	3,780	1,218
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	627
Office [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	5,029	2,966	5,059
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,848	1,883	3,872
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,181	1,083	1,187
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Multifamily [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Industrial [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Other commercial real estate [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	4,818	4,889	5,011
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,277	3,281	2,885
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,541	1,608	2,126
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	67	0
Residential Mortgage [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	23,266	21,206	22,742
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	16,749	14,514	15,745
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	6,517	6,692	6,997
Troubled Debt Restructuring, Specific allowance	85	54	88
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	222	370
Permanent mortage [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	18,755	19,230	18,697
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	13,117	12,670	12,214
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	5,638	6,560	6,483
Troubled Debt Restructuring, Specific allowance	85	54	88
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	208	370
Permanent mortage [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Permanent mortgages guaranteed by US govenment agencies [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	474
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	181
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	293
Troubled Debt Restructuring, Specific allowance	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0
Permanent mortgages guaranteed by US govenment agencies [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	55,507	47,942	54,322
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	15,649	13,184	13,384
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	39,858	34,758	40,938
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0
Home equity {Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	4,037	1,976	4,045
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,451	1,844	3,531
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	586	132	514
Troubled Debt Restructuring, Specific allowance	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	14	0
Consumer [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	759	923	1,008
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	583	759	758
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	176	164	250
Troubled Debt Restructuring, Specific allowance	0	80	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	$ 0	$ 0