Loans, Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 355,160	$ 265,621
Unpaid Principal Balance	394,588	284,433
Related Allowance	46,483	33,669
Average Recorded Investment	378,277	273,011
Interest Income Recognized	$ 10,228	$ 8,716
Net Recorded Investment of the Impaired Loans	78.00%	82.00%
Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	$ 221,012	$ 186,275
Unpaid Principal Balance	236,876	197,109
Related Allowance	46,483	33,669
Average Recorded Investment	237,729	178,871
Interest Income Recognized	8,383	6,798
Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	134,148	79,346
Unpaid Principal Balance	157,712	87,324
Related Allowance	0	0
Average Recorded Investment	140,548	94,140
Interest Income Recognized	1,845	1,918
Commercial and industrial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	215,255	122,868
Unpaid Principal Balance	242,676	131,668
Related Allowance	21,617	8,162
Average Recorded Investment	229,191	126,406
Interest Income Recognized	4,031	2,512
Commercial and industrial | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	101,770	57,785
Unpaid Principal Balance	107,813	59,409
Related Allowance	21,617	8,162
Average Recorded Investment	111,211	46,833
Interest Income Recognized	2,512	855
Commercial and industrial | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	113,485	65,083
Unpaid Principal Balance	134,863	72,259
Related Allowance	0	0
Average Recorded Investment	117,980	79,573
Interest Income Recognized	1,519	1,657
Commercial real estate — owner occupied
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	15,034	15,926
Unpaid Principal Balance	17,907	16,452
Related Allowance	295	448
Average Recorded Investment	15,870	16,621
Interest Income Recognized	412	427
Commercial real estate — owner occupied | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,595	9,705
Unpaid Principal Balance	8,641	9,804
Related Allowance	295	448
Average Recorded Investment	7,111	10,087
Interest Income Recognized	274	412
Commercial real estate — owner occupied | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	8,439	6,221
Unpaid Principal Balance	9,266	6,648
Related Allowance	0	0
Average Recorded Investment	8,759	6,534
Interest Income Recognized	138	15
Commercial and business lending
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	230,289	138,794
Unpaid Principal Balance	260,583	148,120
Related Allowance	21,912	8,610
Average Recorded Investment	245,061	143,027
Interest Income Recognized	4,443	2,939
Commercial and business lending | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	108,365	67,490
Unpaid Principal Balance	116,454	69,213
Related Allowance	21,912	8,610
Average Recorded Investment	118,322	56,920
Interest Income Recognized	2,786	1,267
Commercial and business lending | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	121,924	71,304
Unpaid Principal Balance	144,129	78,907
Related Allowance	0	0
Average Recorded Investment	126,739	86,107
Interest Income Recognized	1,657	1,672
Commercial real estate — investor
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	33,340	30,558
Unpaid Principal Balance	34,155	32,284
Related Allowance	3,541	1,831
Average Recorded Investment	38,234	31,041
Interest Income Recognized	2,124	2,004
Commercial real estate — investor | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	27,196	27,822
Unpaid Principal Balance	27,677	29,444
Related Allowance	3,541	1,831
Average Recorded Investment	31,142	28,278
Interest Income Recognized	2,124	1,914
Commercial real estate — investor | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,144	2,736
Unpaid Principal Balance	6,478	2,840
Related Allowance	0	0
Average Recorded Investment	7,092	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	1,203	1,450
Unpaid Principal Balance	1,566	2,154
Related Allowance	441	453
Average Recorded Investment	1,321	1,667
Interest Income Recognized	67	66
Real estate construction | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,203	1,450
Unpaid Principal Balance	1,566	2,154
Related Allowance	441	453
Average Recorded Investment	1,321	1,667
Interest Income Recognized	67	66
Real estate construction | Loans with no related allowance
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
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	34,543	32,008
Unpaid Principal Balance	35,721	34,438
Related Allowance	3,982	2,284
Average Recorded Investment	39,555	32,708
Interest Income Recognized	2,191	2,070
Commercial real estate lending | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	28,399	29,272
Unpaid Principal Balance	29,243	31,598
Related Allowance	3,982	2,284
Average Recorded Investment	32,463	29,945
Interest Income Recognized	2,191	1,980
Commercial real estate lending | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,144	2,736
Unpaid Principal Balance	6,478	2,840
Related Allowance	0	0
Average Recorded Investment	7,092	2,763
Interest Income Recognized	0	90
Total commercial
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	264,832	170,802
Unpaid Principal Balance	296,304	182,558
Related Allowance	25,894	10,894
Average Recorded Investment	284,616	175,735
Interest Income Recognized	6,634	5,009
Total commercial | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	136,764	96,762
Unpaid Principal Balance	145,697	100,811
Related Allowance	25,894	10,894
Average Recorded Investment	150,785	86,865
Interest Income Recognized	4,977	3,247
Total commercial | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	128,068	74,040
Unpaid Principal Balance	150,607	81,747
Related Allowance	0	0
Average Recorded Investment	133,831	88,870
Interest Income Recognized	1,657	1,762
Residential mortgage
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	68,336	71,352
Unpaid Principal Balance	74,088	76,117
Related Allowance	11,091	12,462
Average Recorded Investment	70,435	72,909
Interest Income Recognized	2,447	2,500
Residential mortgage | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	62,362	66,590
Unpaid Principal Balance	67,090	71,084
Related Allowance	11,091	12,462
Average Recorded Investment	63,825	68,183
Interest Income Recognized	2,263	2,374
Residential mortgage | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	5,974	4,762
Unpaid Principal Balance	6,998	5,033
Related Allowance	0	0
Average Recorded Investment	6,610	4,726
Interest Income Recognized	184	126
Home equity
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,757	22,313
Unpaid Principal Balance	22,912	24,533
Related Allowance	9,312	10,118
Average Recorded Investment	21,932	23,168
Interest Income Recognized	1,118	1,177
Home equity | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	20,651	21,769
Unpaid Principal Balance	22,805	23,989
Related Allowance	9,312	10,118
Average Recorded Investment	21,825	22,624
Interest Income Recognized	1,114	1,147
Home equity | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	106	544
Unpaid Principal Balance	107	544
Related Allowance	0	0
Average Recorded Investment	107	544
Interest Income Recognized	4	30
Other consumer
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,235	1,154
Unpaid Principal Balance	1,284	1,225
Related Allowance	186	195
Average Recorded Investment	1,294	1,199
Interest Income Recognized	29	30
Other consumer | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	1,235	1,154
Unpaid Principal Balance	1,284	1,225
Related Allowance	186	195
Average Recorded Investment	1,294	1,199
Interest Income Recognized	29	30
Other consumer | Loans with no related allowance
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
Total consumer
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	90,328	94,819
Unpaid Principal Balance	98,284	101,875
Related Allowance	20,589	22,775
Average Recorded Investment	93,661	97,276
Interest Income Recognized	3,594	3,707
Total consumer | Loans with a related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	84,248	89,513
Unpaid Principal Balance	91,179	96,298
Related Allowance	20,589	22,775
Average Recorded Investment	86,944	92,006
Interest Income Recognized	3,406	3,551
Total consumer | Loans with no related allowance
Summarize of nonaccrual loans, accruing loans past due 90 days or more, and restructured loans
Recorded Investment	6,080	5,306
Unpaid Principal Balance	7,105	5,577
Related Allowance	0	0
Average Recorded Investment	6,717	5,270
Interest Income Recognized	$ 188	$ 156