Loans, Allowance for Credit Losses, and Credit Quality Loans by Past Due Status (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Summarized details of Loans
Total Past Due	$ 79,561	$ 127,000
Current	18,445,212	17,466,846
Total loans	18,524,773	17,593,846
Accruing loans past due 90 days or more	$ 1,000	$ 2,000
Percent of current nonaccrual loans	62.00%	54.00%
Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	$ 14,216	$ 26,654
Current	6,071,257	5,879,248
Total loans	6,085,473	5,905,902
Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	5,854	22,462
Current	960,835	985,475
Total loans	966,689	1,007,937
Lease Financing [Member]
Summarized details of Loans
Total Past Due	375	513
Current	42,232	51,016
Total loans	42,607	51,529
Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	20,445	49,629
Current	7,074,324	6,915,739
Total loans	7,094,769	6,965,368
Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	4,783	16,289
Current	3,178,569	3,040,196
Total loans	3,183,352	3,056,485
Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	987	1,942
Current	1,123,293	1,007,014
Total loans	1,124,280	1,008,956
Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	5,770	18,231
Current	4,301,862	4,047,210
Total loans	4,307,632	4,065,441
Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	26,215	67,860
Current	11,376,186	10,962,949
Total loans	11,402,401	11,030,809
Home Equity [Member]
Summarized details of Loans
Total Past Due	16,436	18,912
Current	998,029	1,033,015
Total loans	1,014,465	1,051,927
Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	3,263	3,525
Current	422,466	450,694
Total loans	425,729	454,219
Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	33,647	36,703
Current	5,648,531	5,020,188
Total loans	5,682,178	5,056,891
Consumer Loan [Member]
Summarized details of Loans
Total Past Due	53,346	59,140
Current	7,069,026	6,503,897
Total loans	7,122,372	6,563,037
Accruing Loans [Member]
Summarized details of Loans
Total Past Due	23,488	44,751
Current	18,353,831	17,371,682
Total loans	18,377,319	17,416,433
Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	3,099	15,001
Current	6,023,953	5,841,238
Total loans	6,027,052	5,856,239
Accruing Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	2,018	10,628
Current	951,303	971,484
Total loans	953,321	982,112
Accruing Loans [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	375	0
Current	40,469	49,728
Total loans	40,844	49,728
Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	5,492	25,629
Current	7,015,725	6,862,450
Total loans	7,021,217	6,888,079
Accruing Loans [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	1,218	1,208
Current	3,175,213	3,032,592
Total loans	3,176,431	3,033,800
Accruing Loans [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	373	984
Current	1,122,910	1,002,573
Total loans	1,123,283	1,003,557
Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	1,591	2,192
Current	4,298,123	4,035,165
Total loans	4,299,714	4,037,357
Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	7,083	27,821
Current	11,313,848	10,897,615
Total loans	11,320,931	10,925,436
Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	8,565	8,835
Current	992,259	1,026,641
Total loans	1,000,824	1,035,476
Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	3,029	3,249
Current	422,314	450,357
Total loans	425,343	453,606
Accruing Loans [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,811	4,846
Current	5,625,410	4,997,069
Total loans	5,630,221	5,001,915
Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	16,405	16,930
Current	7,039,983	6,474,067
Total loans	7,056,388	6,490,997
Nonaccrual Loan [Member]
Summarized details of Loans
Total Past Due	56,073	82,249
Current	91,381	95,164
Total loans	147,454	177,413
Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	11,117	11,653
Current	47,304	38,010
Total loans	58,421	49,663
Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	3,836	11,834
Current	9,532	13,991
Total loans	13,368	25,825
Nonaccrual Loan [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	513
Current	1,763	1,288
Total loans	1,763	1,801
Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	14,953	24,000
Current	58,599	53,289
Total loans	73,552	77,289
Nonaccrual Loan [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	3,565	15,081
Current	3,356	7,604
Total loans	6,921	22,685
Nonaccrual Loan [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	614	958
Current	383	4,441
Total loans	997	5,399
Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	4,179	16,039
Current	3,739	12,045
Total loans	7,918	28,084
Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	19,132	40,039
Current	62,338	65,334
Total loans	81,470	105,373
Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	7,871	10,077
Current	5,770	6,374
Total loans	13,641	16,451
Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	234	276
Current	152	337
Total loans	386	613
Nonaccrual Loan [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	28,836	31,857
Current	23,121	23,119
Total loans	51,957	54,976
Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	36,941	42,210
Current	29,043	29,830
Total loans	65,984	72,040
Financing Receivables, 30 to 59 Days Past Due [Member]
Summarized details of Loans
Total Past Due	23,921	39,373
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,160	5,338
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	1,368	11,626
Financing Receivables, 30 to 59 Days Past Due [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	375	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	2,903	16,964
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	1,104	2,569
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	373	1,038
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	1,477	3,607
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	4,380	20,571
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	9,312	8,459
Financing Receivables, 30 to 59 Days Past Due [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	1,209	1,282
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	9,020	9,061
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	19,541	18,802
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member]
Summarized details of Loans
Total Past Due	17,017	26,621
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,133	4,466
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	1,173	8,429
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	375	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	2,681	12,895
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	1,104	712
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	312	951
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	1,416	1,663
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	4,097	14,558
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	7,413	6,988
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	1,162	1,186
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,345	3,889
Financing Receivables, 30 to 59 Days Past Due [Member] | Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	12,920	12,063
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member]
Summarized details of Loans
Total Past Due	6,904	12,752
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	27	872
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	195	3,197
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	222	4,069
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	0	1,857
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	61	87
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	61	1,944
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	283	6,013
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	1,899	1,471
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	47	96
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,675	5,172
Financing Receivables, 30 to 59 Days Past Due [Member] | Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	6,621	6,739
Financing Receivables, 60 to 89 Days Past Due [Member]
Summarized details of Loans
Total Past Due	11,940	22,705
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	3,167	10,908
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	845	2,240
Financing Receivables, 60 to 89 Days Past Due [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	4,012	13,148
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	114	955
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	169	106
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	283	1,061
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	4,295	14,209
Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	2,380	3,561
Financing Receivables, 60 to 89 Days Past Due [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	584	785
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,681	4,150
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	7,645	8,496
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member]
Summarized details of Loans
Total Past Due	4,987	16,507
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,788	10,281
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	845	2,199
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	2,633	12,480
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	114	496
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	61	33
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	175	529
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	2,808	13,009
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	1,152	1,795
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	561	746
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	466	957
Financing Receivables, 60 to 89 Days Past Due [Member] | Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	2,179	3,498
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member]
Summarized details of Loans
Total Past Due	6,953	6,198
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,379	627
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	0	41
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	1,379	668
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	0	459
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	108	73
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	108	532
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	1,487	1,200
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	1,228	1,766
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	23	39
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	4,215	3,193
Financing Receivables, 60 to 89 Days Past Due [Member] | Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	5,466	4,998
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	43,700	64,922
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	9,889	10,408
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	3,641	8,596
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	513
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	13,530	19,517
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	3,565	12,765
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	445	798
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	4,010	13,563
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	17,540	33,080
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	4,744	6,892
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	1,470	1,458
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	19,946	23,492
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	26,160	31,842
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member]
Summarized details of Loans
Total Past Due	1,484	1,623
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	178	254
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	178	254
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	178	254
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	0	52
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	1,306	1,317
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Accruing Loans [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	1,306	1,369
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member]
Summarized details of Loans
Total Past Due	42,216	63,299
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Industrial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	9,711	10,154
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Owner Occupied [Member]
Summarized details of Loans
Total Past Due	3,641	8,596
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Lease Financing [Member]
Summarized details of Loans
Total Past Due	0	513
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial And Business Lending [Member]
Summarized details of Loans
Total Past Due	13,352	19,263
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Investor [Member]
Summarized details of Loans
Total Past Due	3,565	12,765
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Real Estate Construction [Member]
Summarized details of Loans
Total Past Due	445	798
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Real Estate Lending [Member]
Summarized details of Loans
Total Past Due	4,010	13,563
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Commercial Financing Receivable [Member]
Summarized details of Loans
Total Past Due	17,362	32,826
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Home Equity [Member]
Summarized details of Loans
Total Past Due	4,744	6,840
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Installment and Credit Cards [Member]
Summarized details of Loans
Total Past Due	164	141
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Residential Mortgage [Member]
Summarized details of Loans
Total Past Due	19,946	23,492
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Nonaccrual Loan [Member] | Consumer Loan [Member]
Summarized details of Loans
Total Past Due	$ 24,854	$ 30,473