Loans, Impaired Loans Recorded Investment, Unpaid Principal Balance, Related Allowance, Average Recorded Investment, and Interest Income Recognized (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 119,925	$ 133,690
Unpaid Principal Balance	171,354	164,766
Related Allowance	23,291	15,304
Average Recorded Investment	108,675	145,707
Interest Income Recognized	$ 2,338	$ 3,626
Net Recorded Investment of the Impaired Loans	56.00%	72.00%
Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 81,787	$ 96,609
Unpaid Principal Balance	95,157	102,483
Related Allowance	23,291	15,304
Average Recorded Investment	83,840	110,079
Interest Income Recognized	1,883	3,699
Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	38,138	37,081
Unpaid Principal Balance	76,197	62,283
Related Allowance	0	0
Average Recorded Investment	24,835	35,627
Interest Income Recognized	456	73
Commercial and industrial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	70,568	63,153
Unpaid Principal Balance	118,829	87,155
Related Allowance	17,791	5,721
Average Recorded Investment	59,887	73,813
Interest Income Recognized	1,003	823
Commercial and industrial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	48,597	40,747
Unpaid Principal Balance	59,132	42,131
Related Allowance	17,791	5,721
Average Recorded Investment	45,439	52,461
Interest Income Recognized	1,003	1,167
Commercial and industrial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	21,971	22,406
Unpaid Principal Balance	59,697	45,024
Related Allowance	0	0
Average Recorded Investment	14,448	21,352
Interest Income Recognized	0	344
Commercial real estate — owner occupied
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,912	5,852
Unpaid Principal Balance	1,919	6,910
Related Allowance	19	24
Average Recorded Investment	1,988	6,154
Interest Income Recognized	78	104
Commercial real estate — owner occupied | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,912	2,080
Unpaid Principal Balance	1,919	2,087
Related Allowance	19	24
Average Recorded Investment	1,988	2,179
Interest Income Recognized	78	104
Commercial real estate — owner occupied | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	0	3,772
Unpaid Principal Balance	0	4,823
Related Allowance	0	0
Average Recorded Investment	0	3,975
Interest Income Recognized	0	0
Commercial and business lending
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	72,480	69,005
Unpaid Principal Balance	120,748	94,065
Related Allowance	17,811	5,745
Average Recorded Investment	61,875	79,967
Interest Income Recognized	1,081	927
Commercial and business lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	50,510	42,827
Unpaid Principal Balance	61,051	44,218
Related Allowance	17,811	5,745
Average Recorded Investment	47,427	54,640
Interest Income Recognized	1,081	1,271
Commercial and business lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	21,971	26,178
Unpaid Principal Balance	59,697	49,847
Related Allowance	0	0
Average Recorded Investment	14,448	25,327
Interest Income Recognized	0	344
Commercial real estate — investor
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	5,104	2,384
Unpaid Principal Balance	6,280	3,625
Related Allowance	101	28
Average Recorded Investment	1,417	1,807
Interest Income Recognized	180	106
Commercial real estate — investor | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,400	799
Unpaid Principal Balance	2,575	805
Related Allowance	101	28
Average Recorded Investment	780	827
Interest Income Recognized	21	38
Commercial real estate — investor | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,705	1,585
Unpaid Principal Balance	3,705	2,820
Related Allowance	0	0
Average Recorded Investment	637	980
Interest Income Recognized	159	68
Real estate construction
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	409	510
Unpaid Principal Balance	490	589
Related Allowance	56	75
Average Recorded Investment	419	533
Interest Income Recognized	21	32
Real estate construction | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	409	510
Unpaid Principal Balance	490	589
Related Allowance	56	75
Average Recorded Investment	419	533
Interest Income Recognized	21	32
Real estate construction | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
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
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	5,514	2,894
Unpaid Principal Balance	6,770	4,214
Related Allowance	157	103
Average Recorded Investment	1,836	2,340
Interest Income Recognized	201	138
Commercial real estate lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,809	1,309
Unpaid Principal Balance	3,066	1,394
Related Allowance	157	103
Average Recorded Investment	1,199	1,360
Interest Income Recognized	42	70
Commercial real estate lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,705	1,585
Unpaid Principal Balance	3,705	2,820
Related Allowance	0	0
Average Recorded Investment	637	980
Interest Income Recognized	159	68
Total commercial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	77,994	71,899
Unpaid Principal Balance	127,518	98,279
Related Allowance	17,968	5,848
Average Recorded Investment	63,712	82,307
Interest Income Recognized	1,282	1,065
Total commercial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	52,319	44,136
Unpaid Principal Balance	64,116	45,612
Related Allowance	17,968	5,848
Average Recorded Investment	48,626	56,000
Interest Income Recognized	1,123	1,341
Total commercial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	25,675	27,763
Unpaid Principal Balance	63,402	52,667
Related Allowance	0	0
Average Recorded Investment	15,086	26,307
Interest Income Recognized	159	276
Residential mortgage
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	36,039	50,486
Unpaid Principal Balance	37,515	54,223
Related Allowance	3,824	6,023
Average Recorded Investment	35,905	51,477
Interest Income Recognized	902	1,992
Residential mortgage | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	24,621	41,691
Unpaid Principal Balance	25,783	45,149
Related Allowance	3,824	6,023
Average Recorded Investment	27,173	42,687
Interest Income Recognized	623	1,789
Residential mortgage | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	11,418	8,795
Unpaid Principal Balance	11,732	9,074
Related Allowance	0	0
Average Recorded Investment	8,732	8,790
Interest Income Recognized	279	203
Home equity
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	4,648	10,124
Unpaid Principal Balance	5,075	11,081
Related Allowance	1,313	3,312
Average Recorded Investment	7,812	10,739
Interest Income Recognized	154	566
Home equity | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	3,604	9,601
Unpaid Principal Balance	4,011	10,539
Related Allowance	1,313	3,312
Average Recorded Investment	6,796	10,209
Interest Income Recognized	136	566
Home equity | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,044	523
Unpaid Principal Balance	1,063	542
Related Allowance	0	0
Average Recorded Investment	1,017	530
Interest Income Recognized	18	0
Other consumer
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,244	1,181
Unpaid Principal Balance	1,246	1,183
Related Allowance	187	121
Average Recorded Investment	1,246	1,184
Interest Income Recognized	1	3
Other consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,244	1,181
Unpaid Principal Balance	1,246	1,183
Related Allowance	187	121
Average Recorded Investment	1,246	1,184
Interest Income Recognized	1	3
Other consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
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
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	41,931	61,791
Unpaid Principal Balance	43,836	66,487
Related Allowance	5,323	9,456
Average Recorded Investment	44,964	63,400
Interest Income Recognized	1,056	2,561
Total consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	29,468	52,473
Unpaid Principal Balance	31,041	56,871
Related Allowance	5,323	9,456
Average Recorded Investment	35,214	54,080
Interest Income Recognized	760	2,358
Total consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	12,462	9,318
Unpaid Principal Balance	12,795	9,616
Related Allowance	0	0
Average Recorded Investment	9,749	9,320
Interest Income Recognized	$ 297	$ 203