Loans and Allowances for Credit Losses Part 5 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	$ 109,855	$ 109,050	$ 109,855	$ 109,050	$ 106,281
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	46,904	38,768	46,904	38,768	42,343
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	62,951	70,282	62,951	70,282	63,938
Troubled Debt Restructuring, Specific allowance	3,402	395	3,402	395	441
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	160	208	174	1,176
Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	52,037	60,317	52,037	60,317	51,959
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	29,635	26,170	29,635	26,170	28,959
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	22,402	34,147	22,402	34,147	23,000
Troubled Debt Restructuring, Specific allowance	3,402	395	3,402	395	441
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	160	208	174	1,176
Commercial [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	9,576	4,993	9,576	4,993	3,632
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	4,763	1,867	4,763	1,867	1,114
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	4,813	3,126	4,813	3,126	2,518
Troubled Debt Restructuring, Specific allowance	3,157	240	3,157	240	246
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Energy [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Services [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	1,762	3,065	1,762	3,065	2,235
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	742	710	742	710	852
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,020	2,355	1,020	2,355	1,383
Troubled Debt Restructuring, Specific allowance	148	228	148	228	237
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Wholesale/retail [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	3,719	1,107	3,719	1,107	235
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,598	968	3,598	968	89
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	121	139	121	139	146
Troubled Debt Restructuring, Specific allowance	9	12	9	12	9
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Manufacturing [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	3,369	0	3,369	0	391
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	369	0	369	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	3,000	0	3,000	0	391
Troubled Debt Restructuring, Specific allowance	3,000	0	3,000	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Healthcare [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Other commercial and industrial [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	726	821	726	821	771
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	54	189	54	189	173
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	672	632	672	632	598
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Commercial Real Estate [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	18,738	32,639	18,738	32,639	24,577
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	8,724	8,798	8,724	8,798	11,342
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	10,014	23,841	10,014	23,841	13,235
Troubled Debt Restructuring, Specific allowance	162	23	162	23	107
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	131	0	758
Residential construction and land development [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	9,482	11,734	9,482	11,734	10,148
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	1,622	1,934	1,622	1,934	1,444
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	7,860	9,800	7,860	9,800	8,704
Troubled Debt Restructuring, Specific allowance	162	23	162	23	107
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	54	0	54
Retail [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	3,727	5,681	3,727	5,681	4,359
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	2,535	1,604	2,535	1,604	3,141
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,192	4,077	1,192	4,077	1,218
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	627
Office [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	2,378	5,488	2,378	5,488	5,059
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	1,416	1,313	1,416	1,313	3,872
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	962	4,175	962	4,175	1,187
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	77	0	77
Multifamily [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	990	0	990	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	208	0	208	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	782	0	782	0
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Industrial [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0	0	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0	0	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0	0	0	0
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Other commercial real estate [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	3,151	8,746	3,151	8,746	5,011
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,151	3,739	3,151	3,739	2,885
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	5,007	0	5,007	2,126
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Residential Mortgage [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	23,113	21,143	23,113	21,143	22,742
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	15,708	14,181	15,708	14,181	15,745
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	7,405	6,962	7,405	6,962	6,997
Troubled Debt Restructuring, Specific allowance	83	54	83	54	88
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	159	77	173	417
Permanent mortage [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	17,182	17,639	17,182	17,639	18,697
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	11,605	10,917	11,605	10,917	12,214
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	5,577	6,722	5,577	6,722	6,483
Troubled Debt Restructuring, Specific allowance	83	54	83	54	88
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	107	8	108	348
Permanent mortgages guaranteed by US govenment agencies [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	855		855
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	180		180
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	675		675
Troubled Debt Restructuring, Specific allowance	0		0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0		0
Permanent mortgages guaranteed by US govenment agencies [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	57,818	48,733	57,818	48,733	54,322
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	17,269	12,598	17,269	12,598	13,384
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	40,549	36,135	40,549	36,135	40,938
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	0	0	0	0
Home equity {Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	5,076	3,504	5,076	3,504	4,045
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,923	3,264	3,923	3,264	3,531
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,153	240	1,153	240	514
Troubled Debt Restructuring, Specific allowance	0	0	0	0	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	52	69	65	69
Consumer [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	610	1,542	610	1,542	1,008
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	440	1,324	440	1,324	758
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	170	218	170	218	250
Troubled Debt Restructuring, Specific allowance	0	78	0	78	0
Financing Receivables, Impaired, Troubled Debt Restructuring, Charge-offs	$ 1	$ 0	$ 1	$ 1