Loans and Allowances for Credit Losses Part 5 (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	$ 106,281	$ 97,985
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	42,343	48,126
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	63,938	49,859
Troubled Debt Restructuring, Specific allowance	441	273
Troubled Debt Restructuring, Charge-offs	1,481	5,525
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	54,322	38,515
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	13,384	8,755
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	40,938	29,760
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	0
Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	51,959	59,470
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	28,959	39,371
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	23,000	20,099
Troubled Debt Restructuring, Specific allowance	441	273
Troubled Debt Restructuring, Charge-offs	1,481	5,525
Commercial Loan [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	3,632	5,521
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	1,114	3,525
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	2,518	1,996
Troubled Debt Restructuring, Specific allowance	246	60
Troubled Debt Restructuring, Charge-offs	154	107
Energy [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	0
Services [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	2,235	2,492
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	852	2,099
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,383	393
Troubled Debt Restructuring, Specific allowance	237	45
Troubled Debt Restructuring, Charge-offs	0	0
Wholesale/retail [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	235	2,290
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	89	1,362
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	146	928
Troubled Debt Restructuring, Specific allowance	9	15
Troubled Debt Restructuring, Charge-offs	0	107
Manufacturing [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	391	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	391	0
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	154	0
Healthcare [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	64
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	64
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Specific allowance	0	0
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
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	0
Other commercial and industrial [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	771	675
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	173	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	598	675
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	0
Commercial Real Estate [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	24,577	30,599
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	11,342	21,043
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	13,235	9,556
Troubled Debt Restructuring, Specific allowance	107	76
Troubled Debt Restructuring, Charge-offs	745	3,744
Residential construction and land development [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	10,148	14,898
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	1,444	9,989
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	8,704	4,909
Troubled Debt Restructuring, Specific allowance	107	76
Troubled Debt Restructuring, Charge-offs	46	1,143
Retail [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	4,359	6,785
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,141	5,735
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,218	1,050
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	582	150
Office [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	5,059	3,899
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,872	1,920
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	1,187	1,979
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	117	269
Multifamily [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	0
Industrial [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	0
Other commercial real estate [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	5,011	5,017
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	2,885	3,399
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	2,126	1,618
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	2,182
Residential Mortgage [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	22,742	20,490
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	15,745	12,214
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	6,997	8,276
Troubled Debt Restructuring, Specific allowance	88	54
Troubled Debt Restructuring, Charge-offs	581	1,476
Permanent Mortgage [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	0	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	0	0
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	0
Permanent Mortgage [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	18,697	20,490
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	12,214	12,214
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	6,483	8,276
Troubled Debt Restructuring, Specific allowance	88	54
Troubled Debt Restructuring, Charge-offs	469	1,476
Permanent mortgages guaranteed by U.S. government agencies [Member] | Accruing [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	54,322	38,515
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	13,384	8,755
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	40,938	29,760
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	0	0
Home equity | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	4,045	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	3,531	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	514	0
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	112	0
Consumer Loan [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	1,008	2,860
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	758	2,589
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	250	271
Troubled Debt Restructuring, Specific allowance	0	83
Troubled Debt Restructuring, Charge-offs	1	198
Indirect automobile [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	629	0
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	555	0
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	74	0
Troubled Debt Restructuring, Specific allowance	0	0
Troubled Debt Restructuring, Charge-offs	1	0
Other consumer [Member] | Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled Debt Restructuring, Recorded Investment	379	2,860
Troubled Debt Restructuring, Performing in Accordance With Modified Terms	203	2,589
Troubled Debt Restructuring, Not Performing in Accordance With Modified Terms	176	271
Troubled Debt Restructuring, Specific allowance	0	83
Troubled Debt Restructuring, Charge-offs	$ 0	$ 198