Allowance for Loan Losses Accruing and Non-Accruing Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 155,529	$ 130,458	$ 135,408
Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	13,565,577	12,424,268	12,007,664
Financing Receivable, Recorded Investment, Past Due	82,748	69,544	64,095
Financing Receivable, Modifications, Recorded Investment	114,612	83,119	78,979
Impaired Financing Receivable, Related Allowance	10,882	5,950	6,052
Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,874,271	2,403,824	2,676,903
Financing Receivable, Recorded Investment, Past Due	40,693	75,356	68,201
Financing Receivable, Modifications, Recorded Investment	18,981	12,100	10,904
Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,202	9,224	8,794
Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	21,936	35,239	45,525
Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current		84,600	80,767
Financing Receivable, Recorded Investment, Past Due		26,792	35,334
Financing Receivable, Modifications, Recorded Investment		111,392	116,101
Accruing TDRs | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	88,545	62,333	57,497
Financing Receivable, Recorded Investment, Past Due	4,700	5,545	4,194
Financing Receivable, Modifications, Recorded Investment	93,245	67,878	61,691
Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	16,566	7,910	9,057
Financing Receivable, Recorded Investment, Past Due	495	694	164
Financing Receivable, Modifications, Recorded Investment	17,061	8,604	9,221
Accruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	9,883	8,895	7,834
Financing Receivable, Recorded Investment, Past Due	237	0	624
Financing Receivable, Modifications, Recorded Investment	10,120	8,895	8,458
Accruing TDRs | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	10,577	14,357	14,213
Financing Receivable, Recorded Investment, Past Due	11,277	20,553	30,976
Financing Receivable, Modifications, Recorded Investment	21,854	34,910	45,189
Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current		9,892	11,505
Financing Receivable, Recorded Investment, Past Due		9,174	7,802
Financing Receivable, Modifications, Recorded Investment		19,066	19,307
Nonaccruing TDRs | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	9,823	7,949	9,553
Financing Receivable, Recorded Investment, Past Due	11,544	7,292	7,735
Financing Receivable, Modifications, Recorded Investment	21,367	15,241	17,288
Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,642	1,614	1,616
Financing Receivable, Recorded Investment, Past Due	278	1,882	67
Financing Receivable, Modifications, Recorded Investment	1,920	3,496	1,683
Nonaccruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	329	336
Financing Receivable, Recorded Investment, Past Due	82	0	0
Financing Receivable, Modifications, Recorded Investment	82	329	336
Nonaccruing TDRs | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	329	336
Financing Receivable, Recorded Investment, Past Due	82	0	0
Financing Receivable, Modifications, Recorded Investment	82	329	336
Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	7,055	6,645	7,088
Total Tdr Allowance | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	4,437	3,195	3,756
Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	122	228	302
Total Tdr Allowance | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	24	48	26
Total Tdr Allowance | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,496	3,222	3,030
Commercial and Industrial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	44,587	7,318	2,853
Commercial and Industrial | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	37,382	7,123	2,673
Commercial and Industrial | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	5,503,444	5,169,157	5,033,864
Financing Receivable, Recorded Investment, Past Due	18,511	6,044	5,456
Financing Receivable, Modifications, Recorded Investment	37,382	7,123	2,673
Commercial and Industrial | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	270,871	444,137	540,082
Financing Receivable, Recorded Investment, Past Due	3,681	5,117	11,407
Financing Receivable, Modifications, Recorded Investment	7,205	18	3
Commercial and Industrial | Covered Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	177	177
Commercial and Industrial | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	177	177
Commercial and Industrial | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	34,680	6,755	594
Financing Receivable, Recorded Investment, Past Due	1,000	177	177
Financing Receivable, Modifications, Recorded Investment	35,680	6,932	771
Commercial and Industrial | Accruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	27,475	6,740	594
Financing Receivable, Recorded Investment, Past Due	1,000	0	0
Financing Receivable, Modifications, Recorded Investment	28,475	6,740	594
Commercial and Industrial | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	7,205	15	0
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	7,205	15	0
Commercial and Industrial | Accruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	0
Financing Receivable, Recorded Investment, Past Due	0	177	177
Financing Receivable, Modifications, Recorded Investment	0	177	177
Commercial and Industrial | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	2,452	3	119
Financing Receivable, Recorded Investment, Past Due	6,455	383	1,963
Financing Receivable, Modifications, Recorded Investment	8,907	386	2,082
Commercial and Industrial | Nonaccruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	2,452	0	116
Financing Receivable, Recorded Investment, Past Due	6,455	383	1,963
Financing Receivable, Modifications, Recorded Investment	8,907	383	2,079
Commercial and Industrial | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	3	3
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	3	3
Commercial and Industrial | Nonaccruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	0
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Commercial and Industrial | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,013	90	656
Commercial and Industrial | Total Tdr Allowance | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,013	72	653
Commercial and Industrial | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0	18	3
Commercial and Industrial | Total Tdr Allowance | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0	0	0
Commercial Loan
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	67,778	53,305	59,830
Commercial Loan | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	47,880	24,730	20,760
Commercial Loan | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	47,880	24,730	20,760
Commercial Loan | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	8,164	2,560	2,339
Commercial Loan | Covered Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	11,734	26,015	36,731
Commercial Loan | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	11,734	26,015
Commercial Loan | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment			36,731
Commercial Loan | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	43,585	25,102	22,950
Financing Receivable, Recorded Investment, Past Due	12,124	21,505	30,352
Financing Receivable, Modifications, Recorded Investment	55,709	46,607	53,302
Commercial Loan | Accruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	35,686	19,625	14,944
Financing Receivable, Recorded Investment, Past Due	1,084	952	0
Financing Receivable, Modifications, Recorded Investment	36,770	20,577	14,944
Commercial Loan | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	7,205	15	1,627
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	7,205	15	1,627
Commercial Loan | Accruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	694	5,462
Financing Receivable, Recorded Investment, Past Due	11,040	20,553
Financing Receivable, Modifications, Recorded Investment	11,734	26,015
Commercial Loan | Accruing TDRs | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			6,379
Financing Receivable, Recorded Investment, Past Due			30,352
Financing Receivable, Modifications, Recorded Investment			36,731
Commercial Loan | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	3,961	1,375	2,390
Financing Receivable, Recorded Investment, Past Due	8,108	5,323	4,138
Financing Receivable, Modifications, Recorded Investment	12,069	6,698	6,528
Commercial Loan | Nonaccruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	3,268	394	1,678
Financing Receivable, Recorded Investment, Past Due	7,842	3,759	4,138
Financing Receivable, Modifications, Recorded Investment	11,110	4,153	5,816
Commercial Loan | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	693	981	712
Financing Receivable, Recorded Investment, Past Due	266	1,564	0
Financing Receivable, Modifications, Recorded Investment	959	2,545	712
Commercial Loan | Nonaccruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Modifications, Recorded Investment	0	0
Commercial Loan | Nonaccruing TDRs | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			0
Financing Receivable, Recorded Investment, Past Due			0
Financing Receivable, Modifications, Recorded Investment			0
Commercial Loan | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	4,586	3,557	3,878
Commercial Loan | Total Tdr Allowance | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,048	231	723
Commercial Loan | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	66	152	151
Commercial Loan | Total Tdr Allowance | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,472	3,174
Commercial Loan | Total Tdr Allowance | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance			3,004
Construction Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	411	339	650
Construction Loans | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	0	0	0
Construction Loans | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	615,117
Financing Receivable, Recorded Investment, Past Due	4,452
Financing Receivable, Modifications, Recorded Investment	0	0	0
Construction Loans | Covered Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	411	339	650
Construction Loans | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	411	339	650
Construction Loans | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	411	339	650
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	411	339	650
Construction Loans | Accruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	0
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Construction Loans | Accruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	411	339	650
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	411	339	650
Construction Loans | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	0
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Construction Loans | Nonaccruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	0
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Construction Loans | Nonaccruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	0
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Construction Loans | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	79	295	55
Construction Loans | Total Tdr Allowance | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0	0	0
Construction Loans | Total Tdr Allowance | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	79	295	55
Consumer Home Equity Lines Financing Receivable
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,945	23,201	22,077
Consumer Home Equity Lines Financing Receivable | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,394	7,379	7,624
Consumer Home Equity Lines Financing Receivable | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	7,532	6,932	5,995
Consumer Home Equity Lines Financing Receivable | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,019	8,890	8,458
Consumer Home Equity Lines Financing Receivable | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	23,510	20,986	19,741
Financing Receivable, Recorded Investment, Past Due	703	876	893
Financing Receivable, Modifications, Recorded Investment	24,213	21,862	20,634
Consumer Home Equity Lines Financing Receivable | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	6,786	6,239	6,479
Financing Receivable, Recorded Investment, Past Due	82	269	180
Financing Receivable, Modifications, Recorded Investment	6,868	6,508	6,659
Consumer Home Equity Lines Financing Receivable | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	7,024	6,186	5,764
Financing Receivable, Recorded Investment, Past Due	384	607	89
Financing Receivable, Modifications, Recorded Investment	7,408	6,793	5,853
Consumer Home Equity Lines Financing Receivable | Accruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	9,700	8,561	7,498
Financing Receivable, Recorded Investment, Past Due	237	0	624
Financing Receivable, Modifications, Recorded Investment	9,937	8,561	8,122
Consumer Home Equity Lines Financing Receivable | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	631	1,339	1,393
Financing Receivable, Recorded Investment, Past Due	101	0	50
Financing Receivable, Modifications, Recorded Investment	732	1,339	1,443
Consumer Home Equity Lines Financing Receivable | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	507	871	915
Financing Receivable, Recorded Investment, Past Due	19	0	50
Financing Receivable, Modifications, Recorded Investment	526	871	965
Consumer Home Equity Lines Financing Receivable | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	124	139	142
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	124	139	142
Consumer Home Equity Lines Financing Receivable | Nonaccruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	329	336
Financing Receivable, Recorded Investment, Past Due	82	0	0
Financing Receivable, Modifications, Recorded Investment	82	329	336
Consumer Home Equity Lines Financing Receivable | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	227	243	190
Consumer Home Equity Lines Financing Receivable | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	203	207	190
Consumer Home Equity Lines Financing Receivable | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0	9	0
Consumer Home Equity Lines Financing Receivable | Total Tdr Allowance | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	24	27	0
Consumer Residential Mortgages Financing Receivable
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,678		28,054
Consumer Residential Mortgages Financing Receivable | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment			26,108
Consumer Residential Mortgages Financing Receivable | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment			1,610
Consumer Residential Mortgages Financing Receivable | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	14,908		15,388
Financing Receivable, Recorded Investment, Past Due	2,646		3,384
Financing Receivable, Modifications, Recorded Investment	17,554		18,772
Consumer Residential Mortgages Financing Receivable | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			14,228
Financing Receivable, Recorded Investment, Past Due			3,384
Financing Receivable, Modifications, Recorded Investment			17,612
Consumer Residential Mortgages Financing Receivable | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			824
Financing Receivable, Recorded Investment, Past Due			0
Financing Receivable, Modifications, Recorded Investment			824
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	5,582		5,850
Financing Receivable, Recorded Investment, Past Due	3,542		3,432
Financing Receivable, Modifications, Recorded Investment	9,124		9,282
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			5,113
Financing Receivable, Recorded Investment, Past Due			3,383
Financing Receivable, Modifications, Recorded Investment			8,496
Consumer Residential Mortgages Financing Receivable | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current			737
Financing Receivable, Recorded Investment, Past Due			49
Financing Receivable, Modifications, Recorded Investment			786
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	939		1,475
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance			1,435
Consumer Residential Mortgages Financing Receivable | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance			14
Commercial Real Estate
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	22,780	45,648	56,327
Commercial Real Estate | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,498	17,607	18,087
Commercial Real Estate | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,498	17,607	18,087
Commercial Real Estate | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	959	2,542	2,336
Commercial Real Estate | Covered Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	11,323	25,499	35,904
Commercial Real Estate | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	11,323	25,499	35,904
Commercial Real Estate | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	8,494	18,008	21,706
Financing Receivable, Recorded Investment, Past Due	11,124	21,328	30,175
Financing Receivable, Modifications, Recorded Investment	19,618	39,336	51,881
Commercial Real Estate | Accruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	8,211	12,885	14,350
Financing Receivable, Recorded Investment, Past Due	84	952	0
Financing Receivable, Modifications, Recorded Investment	8,295	13,837	14,350
Commercial Real Estate | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	1,627
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	1,627
Commercial Real Estate | Accruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	283	5,123	5,729
Financing Receivable, Recorded Investment, Past Due	11,040	20,376	30,175
Financing Receivable, Modifications, Recorded Investment	11,323	25,499	35,904
Commercial Real Estate | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,509	1,372	2,271
Financing Receivable, Recorded Investment, Past Due	1,653	4,940	2,175
Financing Receivable, Modifications, Recorded Investment	3,162	6,312	4,446
Commercial Real Estate | Nonaccruing TDRs | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	816	394	1,562
Financing Receivable, Recorded Investment, Past Due	1,387	3,376	2,175
Financing Receivable, Modifications, Recorded Investment	2,203	3,770	3,737
Commercial Real Estate | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	693	978	709
Financing Receivable, Recorded Investment, Past Due	266	1,564	0
Financing Receivable, Modifications, Recorded Investment	959	2,542	709
Commercial Real Estate | Nonaccruing TDRs | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	0
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Commercial Real Estate | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,494	3,172	3,167
Commercial Real Estate | Total Tdr Allowance | Originated Loans Commercial
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	35	159	70
Commercial Real Estate | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	66	134	148
Commercial Real Estate | Total Tdr Allowance | Covered Commercial TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,393	2,879	2,949
Consumer Installment
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	35,412	25,880	24,535
Consumer Installment | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	34,306	24,905	23,575
Consumer Installment | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	1,106	975	960
Consumer Installment | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	33,042	23,095	21,888
Financing Receivable, Recorded Investment, Past Due	926	813	608
Financing Receivable, Modifications, Recorded Investment	33,968	23,908	22,496
Consumer Installment | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	32,062	22,254	21,046
Financing Receivable, Recorded Investment, Past Due	815	726	533
Financing Receivable, Modifications, Recorded Investment	32,877	22,980	21,579
Consumer Installment | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	980	841	842
Financing Receivable, Recorded Investment, Past Due	111	87	75
Financing Receivable, Modifications, Recorded Investment	1,091	928	917
Consumer Installment | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,291	1,687	1,872
Financing Receivable, Recorded Investment, Past Due	153	285	167
Financing Receivable, Modifications, Recorded Investment	1,444	1,972	2,039
Consumer Installment | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,276	1,663	1,847
Financing Receivable, Recorded Investment, Past Due	153	262	149
Financing Receivable, Modifications, Recorded Investment	1,429	1,925	1,996
Consumer Installment | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	15	24	25
Financing Receivable, Recorded Investment, Past Due	0	23	18
Financing Receivable, Modifications, Recorded Investment	15	47	43
Consumer Installment | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,068	1,243	1,223
Consumer Installment | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	1,012	1,178	1,086
Consumer Installment | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	56	65	137
Residential Mortgages
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,678	27,218	28,054
Residential Mortgages | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	24,316	25,251
Residential Mortgages | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	654,185	602,440	583,926
Financing Receivable, Recorded Investment, Past Due	19,406	22,843	22,072
Financing Receivable, Modifications, Recorded Investment	24,316	25,251	26,108
Residential Mortgages | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	332,470	372,685	401,369
Financing Receivable, Recorded Investment, Past Due	8,808	21,799	8,696
Financing Receivable, Modifications, Recorded Investment	2,179	1,633	1,610
Residential Mortgages | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	183	334	336
Residential Mortgages | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	115,688	14,642
Financing Receivable, Recorded Investment, Past Due	16,472	3,538
Financing Receivable, Modifications, Recorded Investment	132,160	18,180
Residential Mortgages | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	13,368	13,440
Financing Receivable, Recorded Investment, Past Due	2,646	3,538
Financing Receivable, Modifications, Recorded Investment	16,014	16,978
Residential Mortgages | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	1,357	868
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivable, Modifications, Recorded Investment	1,357	868
Residential Mortgages | Accruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	183	334	336
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	183	334	336
Residential Mortgages | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	11,465	5,476
Financing Receivable, Recorded Investment, Past Due	11,904	3,562
Financing Receivable, Modifications, Recorded Investment	23,369	9,038
Residential Mortgages | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	4,772	5,006
Financing Receivable, Recorded Investment, Past Due	3,530	3,267
Financing Receivable, Modifications, Recorded Investment	8,302	8,273
Residential Mortgages | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	810	470
Financing Receivable, Recorded Investment, Past Due	12	295
Financing Receivable, Modifications, Recorded Investment	822	765
Residential Mortgages | Nonaccruing TDRs | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	0	0
Financing Receivable, Recorded Investment, Past Due	0	0	0
Financing Receivable, Modifications, Recorded Investment	0	0	0
Residential Mortgages | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance		1,306
Residential Mortgages | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance		1,283
Residential Mortgages | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0	2
Residential Mortgages | Total Tdr Allowance | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	0	21	26
Residential Portfolio Segment | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	939
Credit Card Receivable
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	716	854	912
Credit Card Receivable | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	716	854	912
Credit Card Receivable | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	168,570	162,434	158,245
Financing Receivable, Recorded Investment, Past Due	1,822	2,044	1,868
Financing Receivable, Modifications, Recorded Investment	716	854	912
Credit Card Receivable | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	643	775	800
Financing Receivable, Recorded Investment, Past Due	73	60	97
Financing Receivable, Modifications, Recorded Investment	716	835	897
Credit Card Receivable | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	643	775	800
Financing Receivable, Recorded Investment, Past Due	73	60	97
Financing Receivable, Modifications, Recorded Investment	716	835	897
Credit Card Receivable | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	15	0
Financing Receivable, Recorded Investment, Past Due	0	4	15
Financing Receivable, Modifications, Recorded Investment	0	19	15
Credit Card Receivable | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	0	15	0
Financing Receivable, Recorded Investment, Past Due	0	4	15
Financing Receivable, Modifications, Recorded Investment	0	19	15
Credit Card Receivable | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	235	296	322
Credit Card Receivable | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	235	296	322
Total consumer
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	87,751	77,153	75,578
Total consumer | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	66,732	58,389	58,219
Total consumer | Originated Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	66,732	58,389	58,219
Total consumer | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,817	9,540	8,565
Total consumer | Covered Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment		9,224	8,794
Total consumer | Covered TDR Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Modifications, Recorded Investment	10,202
Total consumer | Accruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	72,103	59,498	57,817
Financing Receivable, Recorded Investment, Past Due	4,348	5,287	4,982
Financing Receivable, Modifications, Recorded Investment	76,451	64,785	62,799
Total consumer | Accruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	52,859	42,708	42,553
Financing Receivable, Recorded Investment, Past Due	3,616	4,593	4,194
Financing Receivable, Modifications, Recorded Investment	56,475	47,301	46,747
Total consumer | Accruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	9,361	7,895	7,430
Financing Receivable, Recorded Investment, Past Due	495	694	164
Financing Receivable, Modifications, Recorded Investment	9,856	8,589	7,594
Total consumer | Nonaccruing TDRs
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	7,504	8,517	9,115
Financing Receivable, Recorded Investment, Past Due	3,796	3,851	3,664
Financing Receivable, Modifications, Recorded Investment	11,300	12,368	12,779
Total consumer | Nonaccruing TDRs | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	6,555	7,555	7,875
Financing Receivable, Recorded Investment, Past Due	3,702	3,533	3,597
Financing Receivable, Modifications, Recorded Investment	10,257	11,088	11,472
Total consumer | Nonaccruing TDRs | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Financing Receivable, Recorded Investment, Current	949	633	904
Financing Receivable, Recorded Investment, Past Due	12	318	67
Financing Receivable, Modifications, Recorded Investment	961	951	971
Total consumer | Total Tdr Allowance
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,469	3,088	3,210
Total consumer | Total Tdr Allowance | Originated Consumer Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	2,389	2,964	3,033
Total consumer | Total Tdr Allowance | Acquired Loans
Accruing and Nonaccruing Troubled Debt Restructurings [Line Items]
Impaired Financing Receivable, Related Allowance	$ 56	$ 76	$ 151