Loans Part 4 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Impaired receivables [Abstract]
Unpaid principal balance	$ 228,931	$ 275,931	$ 245,856
Recorded investment, total	160,435	197,442	176,489
Recorded investment, with no allowance	151,666	65,883	154,595
Recorded investment, with allowance	8,769	131,559	21,894
Recorded investment, related allowance	2,337	9,758	5,776
Recorded investment, average recorded investment	168,465	199,975
Recorded investment, interest income recognized	0	0
Troubled debt restructurings [Abstract]
Recorded investment	50,669		48,126
Performing in accordance with modified terms	25,459		9,538
Not performing in accordance with modified terms	25,210		38,588
Specific allowance	436		2,760
Amounts charged-off during the period	5,190
Commercial Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	5,914		6,228
Performing in accordance with modified terms	2,554		2,868
Not performing in accordance with modified terms	3,360		3,360
Specific allowance	22		24
Amounts charged-off during the period	0
Commercial Real Estate [Member]
Troubled debt restructurings [Abstract]
Recorded investment	36,371		37,627
Performing in accordance with modified terms	14,785		5,106
Not performing in accordance with modified terms	21,586		32,521
Specific allowance	335		2,454
Amounts charged-off during the period	5,166
Consumer Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	3,553		168
Performing in accordance with modified terms	3,545		168
Not performing in accordance with modified terms	8		0
Specific allowance	0		0
Amounts charged-off during the period	0
Residential Mortgage [Member]
Troubled debt restructurings [Abstract]
Recorded investment	4,831		4,103
Performing in accordance with modified terms	4,575		1,396
Not performing in accordance with modified terms	256		2,707
Specific allowance	79		282
Amounts charged-off during the period	24
Energy [Member] | Commercial Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	0		0
Performing in accordance with modified terms	0		0
Not performing in accordance with modified terms	0		0
Specific allowance	0		0
Amounts charged-off during the period	0
Services [Member] | Commercial Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	3,199		3,529
Performing in accordance with modified terms	992		1,907
Not performing in accordance with modified terms	2,207		1,622
Specific allowance	0		0
Amounts charged-off during the period	0
Wholesale/Retail [Member] | Commercial Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	1,676		1,739
Performing in accordance with modified terms	1,480		961
Not performing in accordance with modified terms	196		778
Specific allowance	22		24
Amounts charged-off during the period	0
Manufacturing [Member] | Commercial Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	0		0
Performing in accordance with modified terms	0		0
Not performing in accordance with modified terms	0		0
Specific allowance	0		0
Amounts charged-off during the period	0
Healthcare [Member] | Commercial Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	82		0
Performing in accordance with modified terms	82		0
Not performing in accordance with modified terms	0		0
Specific allowance	0		0
Amounts charged-off during the period	0
Integrated Food Services [Member] | Commercial Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	0		0
Performing in accordance with modified terms	0		0
Not performing in accordance with modified terms	0		0
Specific allowance	0		0
Amounts charged-off during the period	0
Other Commercial and Industrial [Member] | Commercial Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	957		960
Performing in accordance with modified terms	0		0
Not performing in accordance with modified terms	957		960
Specific allowance	0		0
Amounts charged-off during the period	0
Construction and Land Development [Member] | Commercial Real Estate [Member]
Troubled debt restructurings [Abstract]
Recorded investment	21,834		25,890
Performing in accordance with modified terms	10,413		3,585
Not performing in accordance with modified terms	11,421		22,305
Specific allowance	76		1,577
Amounts charged-off during the period	2,692
Retail [Member} | Commercial Real Estate [Member]
Troubled debt restructurings [Abstract]
Recorded investment	3,635		1,070
Performing in accordance with modified terms	1,200		0
Not performing in accordance with modified terms	2,435		1,070
Specific allowance	0		0
Amounts charged-off during the period	0
Office [Member] | Commercial Real Estate [Member]
Troubled debt restructurings [Abstract]
Recorded investment	3,419		2,496
Performing in accordance with modified terms	1,133		1,134
Not performing in accordance with modified terms	2,286		1,362
Specific allowance	0		215
Amounts charged-off during the period	269
Multifamily [Member] | Commercial Real Estate [Member]
Troubled debt restructurings [Abstract]
Recorded investment	0		0
Performing in accordance with modified terms	0		0
Not performing in accordance with modified terms	0		0
Specific allowance	0		0
Amounts charged-off during the period	0
Industrial [Member] | Commercial Real Estate [Member]
Troubled debt restructurings [Abstract]
Recorded investment	0		0
Performing in accordance with modified terms	0		0
Not performing in accordance with modified terms	0		0
Specific allowance	0		0
Amounts charged-off during the period	0
Other Real Estate Loans [Member] | Commercial Real Estate [Member]
Troubled debt restructurings [Abstract]
Recorded investment	7,483		8,171
Performing in accordance with modified terms	2,039		387
Not performing in accordance with modified terms	5,444		7,784
Specific allowance	259		662
Amounts charged-off during the period	2,205
Indirect Automobile [Member] | Consumer Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	0		0
Performing in accordance with modified terms	0		0
Not performing in accordance with modified terms	0		0
Specific allowance	0		0
Amounts charged-off during the period	0
Other Consumer [Member] | Consumer Loan [Member]
Troubled debt restructurings [Abstract]
Recorded investment	3,553		168
Performing in accordance with modified terms	3,545		168
Not performing in accordance with modified terms	8		0
Specific allowance	0		0
Amounts charged-off during the period	0
Permanent Mortgage [Member] | Residential Mortgage [Member]
Troubled debt restructurings [Abstract]
Recorded investment	4,831		4,103
Performing in accordance with modified terms	4,575		1,396
Not performing in accordance with modified terms	256		2,707
Specific allowance	79		282
Amounts charged-off during the period	24
Residential Mortgage Home Equity [Member] | Residential Mortgage [Member]
Troubled debt restructurings [Abstract]
Recorded investment	0		0
Performing in accordance with modified terms	0		0
Not performing in accordance with modified terms	0		0
Specific allowance	0		0
Amounts charged-off during the period	0
Consumer Loan [Member]
Impaired receivables [Abstract]
Unpaid principal balance	5,402	2,725	1,727
Recorded investment, total	4,771	2,567	1,096
Recorded investment, with no allowance	4,771	22	1,096
Recorded investment, with allowance	0	2,545	0
Recorded investment, related allowance	0	89	0
Recorded investment, average recorded investment	2,934	2,159
Recorded investment, interest income recognized	0	0
Consumer Loan [Member] | Consumer Loans Auto Financing Receivable [Member]
Impaired receivables [Abstract]
Unpaid principal balance	0	0	0
Recorded investment, total	0	0	0
Recorded investment, with no allowance	0	0	0
Recorded investment, with allowance	0	0	0
Recorded investment, related allowance	0	0	0
Recorded investment, average recorded investment	0	0
Recorded investment, interest income recognized		0
Consumer Loan [Member] | Consumer Other Financing Receivable [Member]
Impaired receivables [Abstract]
Unpaid principal balance	5,402	2,725	1,727
Recorded investment, total	4,771	2,567	1,096
Recorded investment, with no allowance	4,771	22	1,096
Recorded investment, with allowance	0	2,545	0
Recorded investment, related allowance	0	89	0
Recorded investment, average recorded investment	2,934	2,159
Recorded investment, interest income recognized	0	0
Commercial Loan [Member]
Impaired receivables [Abstract]
Unpaid principal balance	87,018	88,605	93,932
Recorded investment, total	61,677	57,299	68,759
Recorded investment, with no allowance	59,661	16,078	66,439
Recorded investment, with allowance	2,016	41,221	2,320
Recorded investment, related allowance	464	4,686	1,536
Recorded investment, average recorded investment	65,219	47,812
Recorded investment, interest income recognized	0	0
Commercial Loan [Member] | Commercial Energy Financing Receivable [Member]
Impaired receivables [Abstract]
Unpaid principal balance	336	415	336
Recorded investment, total	336	415	336
Recorded investment, with no allowance	336	0	336
Recorded investment, with allowance	0	415	0
Recorded investment, related allowance	0	60	0
Recorded investment, average recorded investment	336	440
Recorded investment, interest income recognized	0	0
Commercial Loan [Member] | Commercial Services Financing Receivable [Member]
Impaired receivables [Abstract]
Unpaid principal balance	22,318	25,195	26,916
Recorded investment, total	12,890	15,720	16,968
Recorded investment, with no allowance	12,237	9,062	16,200
Recorded investment, with allowance	653	6,658	768
Recorded investment, related allowance	307	327	360
Recorded investment, average recorded investment	14,929	17,491
Recorded investment, interest income recognized	0	0
Commercial Loan [Member] | Commercial Wholesale Retail Financing Receivables [Member]
Impaired receivables [Abstract]
Unpaid principal balance	19,085	37,223	24,432
Recorded investment, total	15,388	30,411	21,180
Recorded investment, with no allowance	15,300	1,644	19,702
Recorded investment, with allowance	88	28,767	1,478
Recorded investment, related allowance	22	3,841	1,102
Recorded investment, average recorded investment	18,284	19,449
Recorded investment, interest income recognized	0	0
Commercial Loan [Member] | Commercial Manufacturing Financing Receivable [Member]
Impaired receivables [Abstract]
Unpaid principal balance	26,536	9,400	26,186
Recorded investment, total	23,402	4,545	23,051
Recorded investment, with no allowance	23,402	1,215	23,051
Recorded investment, with allowance	0	3,330	0
Recorded investment, related allowance	0	276	0
Recorded investment, average recorded investment	23,227	3,331
Recorded investment, interest income recognized	0	0
Commercial Loan [Member] | Commercial Healthcare Financing Receivable [Member]
Impaired receivables [Abstract]
Unpaid principal balance	9,529	4,018	6,825
Recorded investment, total	7,946	2,574	5,486
Recorded investment, with no allowance	6,671	523	5,412
Recorded investment, with allowance	1,275	2,051	74
Recorded investment, related allowance	135	182	74
Recorded investment, average recorded investment	6,716	3,054
Recorded investment, interest income recognized	0	0
Commercial Loan [Member] | Commercial Integrated Food Services Financing Receivables [Member]
Impaired receivables [Abstract]
Unpaid principal balance	0	165	0
Recorded investment, total	0	6	0
Recorded investment, with no allowance	0	6	0
Recorded investment, with allowance	0	0	0
Recorded investment, related allowance	0	0	0
Recorded investment, average recorded investment	0	10
Recorded investment, interest income recognized	0	0
Commercial Loan [Member] | Commercial Other Commercial and Industrial [Member]
Impaired receivables [Abstract]
Unpaid principal balance	9,214	12,189	9,237
Recorded investment, total	1,715	3,628	1,738
Recorded investment, with no allowance	1,715	3,628	1,738
Recorded investment, with allowance	0	0	0
Recorded investment, related allowance	0	0	0
Recorded investment, average recorded investment	1,727	4,037
Recorded investment, interest income recognized	0	0
Commercial Real Estate [Member]
Impaired receivables [Abstract]
Unpaid principal balance	127,690	170,060	141,500
Recorded investment, total	86,475	125,504	99,193
Recorded investment, with no allowance	80,402	46,578	82,080
Recorded investment, with allowance	6,073	78,926	17,113
Recorded investment, related allowance	1,644	3,874	3,942
Recorded investment, average recorded investment	92,835	137,936
Recorded investment, interest income recognized	0	0
Commercial Real Estate [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Impaired receivables [Abstract]
Unpaid principal balance	86,435	129,332	98,053
Recorded investment, total	52,416	90,707	61,874
Recorded investment, with no allowance	51,615	37,651	56,740
Recorded investment, with allowance	801	53,056	5,134
Recorded investment, related allowance	206	2,768	1,777
Recorded investment, average recorded investment	57,145	95,143
Recorded investment, interest income recognized	0	0
Commercial Real Estate [Member] | Commercial Real Estate Retail Financing Receivables [Member]
Impaired receivables [Abstract]
Unpaid principal balance	7,680	6,676	8,645
Recorded investment, total	6,193	5,276	6,863
Recorded investment, with no allowance	3,761	1,690	4,373
Recorded investment, with allowance	2,432	3,586	2,490
Recorded investment, related allowance	1,062	599	1,062
Recorded investment, average recorded investment	6,528	5,127
Recorded investment, interest income recognized	0	0
Commercial Real Estate [Member] | Commercial Real Estate Office Financing Receivables [Member]
Impaired receivables [Abstract]
Unpaid principal balance	13,888	16,861	14,588
Recorded investment, total	10,733	14,628	11,457
Recorded investment, with no allowance	10,508	4,968	9,567
Recorded investment, with allowance	225	9,660	1,890
Recorded investment, related allowance	21	144	291
Recorded investment, average recorded investment	11,095	17,141
Recorded investment, interest income recognized	0	0
Commercial Real Estate [Member] | Commercial Real Estate Multifamily Financing Receivables [Member]
Impaired receivables [Abstract]
Unpaid principal balance	3,414	3,096	3,512
Recorded investment, total	3,414	1,900	3,513
Recorded investment, with no allowance	3,414	1,900	3,513
Recorded investment, with allowance	0	0	0
Recorded investment, related allowance	0	0	0
Recorded investment, average recorded investment	3,464	4,313
Recorded investment, interest income recognized	0	0
Commercial Real Estate [Member] | Commercial Real Estate Industrial [Member]
Impaired receivables [Abstract]
Unpaid principal balance	0	0	0
Recorded investment, total	0	0	0
Recorded investment, with no allowance	0	0	0
Recorded investment, with allowance	0	0	0
Recorded investment, related allowance	0	0	0
Recorded investment, average recorded investment	0	2,044
Recorded investment, interest income recognized	0	0
Commercial Real Estate [Member] | Commercial Real Estate Other Real Estate Loans Financing Receivables [Member]
Impaired receivables [Abstract]
Unpaid principal balance	16,273	14,095	16,702
Recorded investment, total	13,719	12,993	15,486
Recorded investment, with no allowance	11,104	369	7,887
Recorded investment, with allowance	2,615	12,624	7,599
Recorded investment, related allowance	355	363	812
Recorded investment, average recorded investment	14,603	14,168
Recorded investment, interest income recognized	0	0
Residential Mortgage [Member]
Impaired receivables [Abstract]
Unpaid principal balance	8,821	14,541	8,697
Recorded investment, total	7,512	12,072	7,441
Recorded investment, with no allowance	6,832	3,205	4,980
Recorded investment, with allowance	680	8,867	2,461
Recorded investment, related allowance	229	1,109	298
Recorded investment, average recorded investment	7,477	12,068
Recorded investment, interest income recognized	0	0
Residential Mortgage [Member] | Residential Mortgage Permanent Mortgage Financing Receivables [Member]
Impaired receivables [Abstract]
Unpaid principal balance	8,821	14,541	8,697
Recorded investment, total	7,512	12,072	7,441
Recorded investment, with no allowance	6,832	3,205	4,980
Recorded investment, with allowance	680	8,867	2,461
Recorded investment, related allowance	229	1,109	298
Recorded investment, average recorded investment	7,477	12,068
Recorded investment, interest income recognized	0	0
Residential Mortgage [Member] | Home Equity [Member]
Impaired receivables [Abstract]
Unpaid principal balance	0	0	0
Recorded investment, total	0	0	0
Recorded investment, with no allowance	0	0	0
Recorded investment, with allowance	0	0	0
Recorded investment, related allowance	0	0	0
Recorded investment, average recorded investment	0	0
Recorded investment, interest income recognized		$ 0