Loans, Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 366,028	$ 265,621
Unpaid Principal Balance	399,009	284,433
Related Allowance	24,200	33,669
Average Recorded Investment	370,376	273,011
Interest Income Recognized	$ 3,777	$ 8,716
Net Recorded Investment of the Impaired Loans	86.00%	82.00%
Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 151,425	$ 186,275
Unpaid Principal Balance	160,378	197,109
Related Allowance	24,200	33,669
Average Recorded Investment	153,644	178,871
Interest Income Recognized	3,313	6,798
Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	214,603	79,346
Unpaid Principal Balance	238,631	87,324
Related Allowance	0	0
Average Recorded Investment	216,732	94,140
Interest Income Recognized	464	1,918
Commercial and industrial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	222,618	122,868
Unpaid Principal Balance	244,165	131,668
Related Allowance	675	8,162
Average Recorded Investment	224,468	126,406
Interest Income Recognized	791	2,512
Commercial and industrial | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	30,866	57,785
Unpaid Principal Balance	31,402	59,409
Related Allowance	675	8,162
Average Recorded Investment	30,915	46,833
Interest Income Recognized	443	855
Commercial and industrial | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	191,752	65,083
Unpaid Principal Balance	212,763	72,259
Related Allowance	0	0
Average Recorded Investment	193,553	79,573
Interest Income Recognized	348	1,657
Commercial real estate — owner occupied
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	17,144	15,926
Unpaid Principal Balance	19,771	16,452
Related Allowance	622	448
Average Recorded Investment	17,484	16,621
Interest Income Recognized	189	427
Commercial real estate — owner occupied | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	10,746	9,705
Unpaid Principal Balance	10,917	9,804
Related Allowance	622	448
Average Recorded Investment	10,904	10,087
Interest Income Recognized	189	412
Commercial real estate — owner occupied | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,398	6,221
Unpaid Principal Balance	8,854	6,648
Related Allowance	0	0
Average Recorded Investment	6,580	6,534
Interest Income Recognized	0	15
Commercial and business lending
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	239,762	138,794
Unpaid Principal Balance	263,936	148,120
Related Allowance	1,297	8,610
Average Recorded Investment	241,952	143,027
Interest Income Recognized	980	2,939
Commercial and business lending | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	41,612	67,490
Unpaid Principal Balance	42,319	69,213
Related Allowance	1,297	8,610
Average Recorded Investment	41,819	56,920
Interest Income Recognized	632	1,267
Commercial and business lending | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	198,150	71,304
Unpaid Principal Balance	221,617	78,907
Related Allowance	0	0
Average Recorded Investment	200,133	86,107
Interest Income Recognized	348	1,672
Commercial real estate — investor
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	31,719	30,558
Unpaid Principal Balance	32,814	32,284
Related Allowance	694	1,831
Average Recorded Investment	32,196	31,041
Interest Income Recognized	943	2,004
Commercial real estate — investor | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	21,983	27,822
Unpaid Principal Balance	22,782	29,444
Related Allowance	694	1,831
Average Recorded Investment	22,387	28,278
Interest Income Recognized	943	1,914
Commercial real estate — investor | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	9,736	2,736
Unpaid Principal Balance	10,032	2,840
Related Allowance	0	0
Average Recorded Investment	9,809	2,763
Interest Income Recognized	0	90
Real estate construction
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,329	1,450
Unpaid Principal Balance	1,801	2,154
Related Allowance	530	453
Average Recorded Investment	1,356	1,667
Interest Income Recognized	34	66
Real estate construction | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,329	1,450
Unpaid Principal Balance	1,801	2,154
Related Allowance	530	453
Average Recorded Investment	1,356	1,667
Interest Income Recognized	34	66
Real estate construction | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Commercial Real Estate Lending [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	33,048	32,008
Unpaid Principal Balance	34,615	34,438
Related Allowance	1,224	2,284
Average Recorded Investment	33,552	32,708
Interest Income Recognized	977	2,070
Commercial Real Estate Lending [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	23,312	29,272
Unpaid Principal Balance	24,583	31,598
Related Allowance	1,224	2,284
Average Recorded Investment	23,743	29,945
Interest Income Recognized	977	1,980
Commercial Real Estate Lending [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	9,736	2,736
Unpaid Principal Balance	10,032	2,840
Related Allowance	0	0
Average Recorded Investment	9,809	2,763
Interest Income Recognized	0	90
Commercial Financing Receivable [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	272,810	170,802
Unpaid Principal Balance	298,551	182,558
Related Allowance	2,521	10,894
Average Recorded Investment	275,504	175,735
Interest Income Recognized	1,957	5,009
Commercial Financing Receivable [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	64,924	96,762
Unpaid Principal Balance	66,902	100,811
Related Allowance	2,521	10,894
Average Recorded Investment	65,562	86,865
Interest Income Recognized	1,609	3,247
Commercial Financing Receivable [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	207,886	74,040
Unpaid Principal Balance	231,649	81,747
Related Allowance	0	0
Average Recorded Investment	209,942	88,870
Interest Income Recognized	348	1,762
Residential mortgage
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	70,614	71,352
Unpaid Principal Balance	75,848	76,117
Related Allowance	11,684	12,462
Average Recorded Investment	71,812	72,909
Interest Income Recognized	1,247	2,500
Residential mortgage | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	64,547	66,590
Unpaid Principal Balance	69,517	71,084
Related Allowance	11,684	12,462
Average Recorded Investment	65,674	68,183
Interest Income Recognized	1,151	2,374
Residential mortgage | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,067	4,762
Unpaid Principal Balance	6,331	5,033
Related Allowance	0	0
Average Recorded Investment	6,138	4,726
Interest Income Recognized	96	126
Home equity
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	21,318	22,313
Unpaid Principal Balance	23,264	24,533
Related Allowance	9,741	10,118
Average Recorded Investment	21,744	23,168
Interest Income Recognized	555	1,177
Home equity | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,668	21,769
Unpaid Principal Balance	22,613	23,989
Related Allowance	9,741	10,118
Average Recorded Investment	21,092	22,624
Interest Income Recognized	535	1,147
Home equity | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	650	544
Unpaid Principal Balance	651	544
Related Allowance	0	0
Average Recorded Investment	652	544
Interest Income Recognized	20	30
Other consumer
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,286	1,154
Unpaid Principal Balance	1,346	1,225
Related Allowance	254	195
Average Recorded Investment	1,316	1,199
Interest Income Recognized	18	30
Other consumer | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,286	1,154
Unpaid Principal Balance	1,346	1,225
Related Allowance	254	195
Average Recorded Investment	1,316	1,199
Interest Income Recognized	18	30
Other consumer | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Average Recorded Investment	0	0
Interest Income Recognized	0	0
Consumer Loan [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	93,218	94,819
Unpaid Principal Balance	100,458	101,875
Related Allowance	21,679	22,775
Average Recorded Investment	94,872	97,276
Interest Income Recognized	1,820	3,707
Consumer Loan [Member] | Loans With Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	86,501	89,513
Unpaid Principal Balance	93,476	96,298
Related Allowance	21,679	22,775
Average Recorded Investment	88,082	92,006
Interest Income Recognized	1,704	3,551
Consumer Loan [Member] | Loans With No Related Allowance [Member]
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,717	5,306
Unpaid Principal Balance	6,982	5,577
Related Allowance	0	0
Average Recorded Investment	6,790	5,270
Interest Income Recognized	$ 116	$ 156