Loans Part 4 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Impaired receivables [Abstract]
Unpaid principal balance	$ 190,325	$ 254,963	$ 190,325	$ 254,963	$ 245,856
Recorded investment, total	126,317	176,331	126,317	176,331	176,489
Recorded investment, with no allowance	120,122	146,331	120,122	146,331	154,595
Recorded investment, with allowance	6,195	30,000	6,195	30,000	21,894
Recorded investment, related allowance	1,835	6,683	1,835	6,683	5,776
Recorded investment, average recorded investment	143,379	186,890	151,407	189,420
Recorded investment, interest income recognized	0	0	0	0
Commercial [Member]
Impaired receivables [Abstract]
Unpaid principal balance	57,185	84,070	57,185	84,070	93,932
Recorded investment, total	34,429	53,162	34,429	53,162	68,759
Recorded investment, with no allowance	32,982	46,833	32,982	46,833	66,439
Recorded investment, with allowance	1,447	6,329	1,447	6,329	2,320
Recorded investment, related allowance	278	2,440	278	2,440	1,536
Recorded investment, average recorded investment	48,054	55,232	51,596	45,743
Recorded investment, interest income recognized	0	0	0	0
Commercial [Member] | Energy [Member]
Impaired receivables [Abstract]
Unpaid principal balance	3,297	345	3,297	345	336
Recorded investment, total	3,087	345	3,087	345	336
Recorded investment, with no allowance	3,087	345	3,087	345	336
Recorded investment, with allowance	0	0	0	0	0
Recorded investment, related allowance	0	0	0	0	0
Recorded investment, average recorded investment	1,712	380	1,712	405
Recorded investment, interest income recognized	0	0	0	0
Commercial [Member] | Services [Member]
Impaired receivables [Abstract]
Unpaid principal balance	18,858	26,441	18,858	26,441	26,916
Recorded investment, total	10,123	16,254	10,123	16,254	16,968
Recorded investment, with no allowance	9,996	15,525	9,996	15,525	16,200
Recorded investment, with allowance	127	729	127	729	768
Recorded investment, related allowance	127	273	127	273	360
Recorded investment, average recorded investment	11,507	15,987	13,546	17,758
Recorded investment, interest income recognized	0	0	0	0
Commercial [Member] | Wholesale/Retail [Member]
Impaired receivables [Abstract]
Unpaid principal balance	5,763	31,770	5,763	31,770	24,432
Recorded investment, total	4,175	25,138	4,175	25,138	21,180
Recorded investment, with no allowance	4,096	22,751	4,096	22,751	19,702
Recorded investment, with allowance	79	2,387	79	2,387	1,478
Recorded investment, related allowance	20	1,742	20	1,742	1,102
Recorded investment, average recorded investment	9,782	27,775	12,678	16,812
Recorded investment, interest income recognized	0	0	0	0
Commercial [Member] | Manufacturing [Member]
Impaired receivables [Abstract]
Unpaid principal balance	15,864	9,259	15,864	9,259	26,186
Recorded investment, total	12,230	4,366	12,230	4,366	23,051
Recorded investment, with no allowance	12,230	2,012	12,230	2,012	23,051
Recorded investment, with allowance	0	2,354	0	2,354	0
Recorded investment, related allowance	0	259	0	259	0
Recorded investment, average recorded investment	17,816	4,456	17,641	3,241
Recorded investment, interest income recognized	0	0	0	0
Commercial [Member] | Healthcare [Member]
Impaired receivables [Abstract]
Unpaid principal balance	4,400	7,659	4,400	7,659	6,825
Recorded investment, total	3,310	5,962	3,310	5,962	5,486
Recorded investment, with no allowance	2,069	5,103	2,069	5,103	5,412
Recorded investment, with allowance	1,241	859	1,241	859	74
Recorded investment, related allowance	131	166	131	166	74
Recorded investment, average recorded investment	5,628	4,268	4,398	4,748
Recorded investment, interest income recognized	0	0	0	0
Commercial [Member] | Integrated Food Services [Member]
Impaired receivables [Abstract]
Unpaid principal balance	0	0	0	0	0
Recorded investment, total	0	0	0	0	0
Recorded investment, with no allowance	0	0	0	0	0
Recorded investment, with allowance	0	0	0	0	0
Recorded investment, related allowance	0	0	0	0	0
Recorded investment, average recorded investment	0	3	0	7
Recorded investment, interest income recognized	0	0	0	0
Commercial [Member] | Other Commercial and Industrial [Member]
Impaired receivables [Abstract]
Unpaid principal balance	9,003	8,596	9,003	8,596	9,237
Recorded investment, total	1,504	1,097	1,504	1,097	1,738
Recorded investment, with no allowance	1,504	1,097	1,504	1,097	1,738
Recorded investment, with allowance	0	0	0	0	0
Recorded investment, related allowance	0	0	0	0	0
Recorded investment, average recorded investment	1,609	2,363	1,621	2,772
Recorded investment, interest income recognized	0	0	0	0
Commercial Real Estate [Member]
Impaired receivables [Abstract]
Unpaid principal balance	119,663	156,322	119,663	156,322	141,500
Recorded investment, total	80,208	110,363	80,208	110,363	99,193
Recorded investment, with no allowance	76,119	93,134	76,119	93,134	82,080
Recorded investment, with allowance	4,089	17,229	4,089	17,229	17,113
Recorded investment, related allowance	1,280	3,139	1,280	3,139	3,942
Recorded investment, average recorded investment	83,343	117,935	89,701	130,366
Recorded investment, interest income recognized	0	0	0	0
Commercial Real Estate [Member] | Construction and Land Development [Member]
Impaired receivables [Abstract]
Unpaid principal balance	78,447	115,337	78,447	115,337	98,053
Recorded investment, total	46,050	76,265	46,050	76,265	61,874
Recorded investment, with no allowance	45,477	65,094	45,477	65,094	56,740
Recorded investment, with allowance	573	11,171	573	11,171	5,134
Recorded investment, related allowance	155	1,966	155	1,966	1,777
Recorded investment, average recorded investment	49,233	83,486	53,962	87,922
Recorded investment, interest income recognized	0	0	0	0
Commercial Real Estate [Member] | Retail [Member]
Impaired receivables [Abstract]
Unpaid principal balance	9,395	5,652	9,395	5,652	8,645
Recorded investment, total	7,908	4,642	7,908	4,642	6,863
Recorded investment, with no allowance	5,541	1,855	5,541	1,855	4,373
Recorded investment, with allowance	2,367	2,787	2,367	2,787	2,490
Recorded investment, related allowance	905	612	905	612	1,062
Recorded investment, average recorded investment	7,051	4,959	7,386	4,810
Recorded investment, interest income recognized	0	0	0	0
Commercial Real Estate [Member] | Office [Member]
Impaired receivables [Abstract]
Unpaid principal balance	13,744	14,749	13,744	14,749	14,588
Recorded investment, total	10,589	11,473	10,589	11,473	11,457
Recorded investment, with no allowance	10,364	9,713	10,364	9,713	9,567
Recorded investment, with allowance	225	1,760	225	1,760	1,890
Recorded investment, related allowance	21	207	21	207	291
Recorded investment, average recorded investment	10,661	13,051	11,023	15,564
Recorded investment, interest income recognized	0	0	0	0
Commercial Real Estate [Member] | Multifamily [Member]
Impaired receivables [Abstract]
Unpaid principal balance	3,333	5,381	3,333	5,381	3,512
Recorded investment, total	3,219	4,717	3,219	4,717	3,513
Recorded investment, with no allowance	3,219	4,717	3,219	4,717	3,513
Recorded investment, with allowance	0	0	0	0	0
Recorded investment, related allowance	0	0	0	0	0
Recorded investment, average recorded investment	3,317	3,309	3,366	5,721
Recorded investment, interest income recognized	0	0	0	0
Commercial Real Estate [Member] | Industrial [Member]
Impaired receivables [Abstract]
Unpaid principal balance	0	0	0	0	0
Recorded investment, total	0	0	0	0	0
Recorded investment, with no allowance	0	0	0	0	0
Recorded investment, with allowance	0	0	0	0	0
Recorded investment, related allowance	0	0	0	0	0
Recorded investment, average recorded investment	0	0	0	2,044
Recorded investment, interest income recognized	0	0	0	0
Commercial Real Estate [Member] | Other Commercial Real Estate [Member]
Impaired receivables [Abstract]
Unpaid principal balance	14,744	15,203	14,744	15,203	16,702
Recorded investment, total	12,442	13,266	12,442	13,266	15,486
Recorded investment, with no allowance	11,518	11,755	11,518	11,755	7,887
Recorded investment, with allowance	924	1,511	924	1,511	7,599
Recorded investment, related allowance	199	354	199	354	812
Recorded investment, average recorded investment	13,081	13,130	13,964	14,305
Recorded investment, interest income recognized	0	0	0	0
Residential Mortgage [Member]
Impaired receivables [Abstract]
Unpaid principal balance	8,421	12,122	8,421	12,122	8,697
Recorded investment, total	7,210	10,885	7,210	10,885	7,441
Recorded investment, with no allowance	6,593	5,016	6,593	5,016	4,980
Recorded investment, with allowance	617	5,869	617	5,869	2,461
Recorded investment, related allowance	235	989	235	989	298
Recorded investment, average recorded investment	7,361	11,479	7,326	11,475
Recorded investment, interest income recognized	0	0	0	0
Residential Mortgage [Member] | Permanent Residential Mortgage [Member]
Impaired receivables [Abstract]
Unpaid principal balance	8,421	12,122	8,421	12,122	8,697
Recorded investment, total	7,210	10,885	7,210	10,885	7,441
Recorded investment, with no allowance	6,593	5,016	6,593	5,016	4,980
Recorded investment, with allowance	617	5,869	617	5,869	2,461
Recorded investment, related allowance	235	989	235	989	298
Recorded investment, average recorded investment	7,361	11,479	7,326	11,475
Recorded investment, interest income recognized	0	0	0	0
Residential Mortgage [Member] | Home Equity [Member]
Impaired receivables [Abstract]
Unpaid principal balance	0	0	0	0	0
Recorded investment, total	0	0	0	0	0
Recorded investment, with no allowance	0	0	0	0	0
Recorded investment, with allowance	0	0	0	0	0
Recorded investment, related allowance	0	0	0	0	0
Recorded investment, average recorded investment	0	0	0	0
Recorded investment, interest income recognized	0	0	0	0
Consumer [Member]
Impaired receivables [Abstract]
Unpaid principal balance	5,056	2,449	5,056	2,449	1,727
Recorded investment, total	4,470	1,921	4,470	1,921	1,096
Recorded investment, with no allowance	4,428	1,348	4,428	1,348	1,096
Recorded investment, with allowance	42	573	42	573	0
Recorded investment, related allowance	42	115	42	115	0
Recorded investment, average recorded investment	4,621	2,244	2,784	1,836
Recorded investment, interest income recognized	0	0	0	0
Consumer [Member] | Indirect Automobile [Member]
Impaired receivables [Abstract]
Unpaid principal balance	0	0	0	0	0
Recorded investment, total	0	0	0	0	0
Recorded investment, with no allowance	0	0	0	0	0
Recorded investment, with allowance	0	0	0	0	0
Recorded investment, related allowance	0	0	0	0	0
Recorded investment, average recorded investment	0	0	0	0
Recorded investment, interest income recognized	0	0	0	0
Consumer [Member] | Other Consumer [Member]
Impaired receivables [Abstract]
Unpaid principal balance	5,056	2,449	5,056	2,449	1,727
Recorded investment, total	4,470	1,921	4,470	1,921	1,096
Recorded investment, with no allowance	4,428	1,348	4,428	1,348	1,096
Recorded investment, with allowance	42	573	42	573	0
Recorded investment, related allowance	42	115	42	115	0
Recorded investment, average recorded investment	4,621	2,244	2,784	1,836
Recorded investment, interest income recognized	$ 0	$ 0	$ 0	$ 0