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, 2019		Dec. 31, 2018
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 172,489	[1]	$ 133,690	[2]
Unpaid Principal Balance	207,111	[1]	164,766	[2]
Related Allowance	32,188	[1]	15,304	[2]
Average Recorded Investment	142,258		145,707
Interest Income Recognized	$ 2,633		$ 3,626
Net Recorded Investment of the Impaired Loans	68.00%		72.00%
Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	$ 143,414		$ 96,609
Unpaid Principal Balance	158,952		102,483
Related Allowance	32,188		15,304
Average Recorded Investment	109,565		110,079
Interest Income Recognized	2,417		3,699
Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	29,075		37,081
Unpaid Principal Balance	48,159		62,283
Related Allowance	0		0
Average Recorded Investment	32,694		35,627
Interest Income Recognized	216		73
Commercial and industrial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	100,066		63,153
Unpaid Principal Balance	128,758		87,155
Related Allowance	22,890		5,721
Average Recorded Investment	71,421		73,813
Interest Income Recognized	1,129		823
Commercial and industrial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	83,561		40,747
Unpaid Principal Balance	94,759		42,131
Related Allowance	22,890		5,721
Average Recorded Investment	48,118		52,461
Interest Income Recognized	1,104		1,167
Commercial and industrial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	16,505		22,406
Unpaid Principal Balance	33,999		45,024
Related Allowance	0		0
Average Recorded Investment	23,303		21,352
Interest Income Recognized	25		344
Commercial real estate — owner occupied
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	2,473		5,852
Unpaid Principal Balance	2,712		6,910
Related Allowance	27		24
Average Recorded Investment	2,586		6,154
Interest Income Recognized	54		104
Commercial real estate — owner occupied | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,970		2,080
Unpaid Principal Balance	1,977		2,087
Related Allowance	27		24
Average Recorded Investment	2,017		2,179
Interest Income Recognized	51		104
Commercial real estate — owner occupied | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	503		3,772
Unpaid Principal Balance	735		4,823
Related Allowance	0		0
Average Recorded Investment	569		3,975
Interest Income Recognized	3		0
Commercial and business lending
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	102,538		69,005
Unpaid Principal Balance	131,470		94,065
Related Allowance	22,917		5,745
Average Recorded Investment	74,007		79,967
Interest Income Recognized	1,183		927
Commercial and business lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	85,531		42,827
Unpaid Principal Balance	96,735		44,218
Related Allowance	22,917		5,745
Average Recorded Investment	50,135		54,640
Interest Income Recognized	1,155		1,271
Commercial and business lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	17,007		26,178
Unpaid Principal Balance	34,734		49,847
Related Allowance	0		0
Average Recorded Investment	23,872		25,327
Interest Income Recognized	28		344
Commercial real estate — investor
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,411		2,384
Unpaid Principal Balance	2,587		3,625
Related Allowance	103		28
Average Recorded Investment	1,424		1,807
Interest Income Recognized	17		106
Commercial real estate — investor | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	776		799
Unpaid Principal Balance	782		805
Related Allowance	103		28
Average Recorded Investment	786		827
Interest Income Recognized	17		38
Commercial real estate — investor | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	635		1,585
Unpaid Principal Balance	1,805		2,820
Related Allowance	0		0
Average Recorded Investment	638		980
Interest Income Recognized	0		68
Real estate construction
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	417		510
Unpaid Principal Balance	497		589
Related Allowance	56		75
Average Recorded Investment	422		533
Interest Income Recognized	14		32
Real estate construction | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	417		510
Unpaid Principal Balance	497		589
Related Allowance	56		75
Average Recorded Investment	422		533
Interest Income Recognized	14		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	1,828		2,894
Unpaid Principal Balance	3,084		4,214
Related Allowance	159		103
Average Recorded Investment	1,847		2,340
Interest Income Recognized	31		138
Commercial real estate lending | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,193		1,309
Unpaid Principal Balance	1,279		1,394
Related Allowance	159		103
Average Recorded Investment	1,208		1,360
Interest Income Recognized	31		70
Commercial real estate lending | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	635		1,585
Unpaid Principal Balance	1,805		2,820
Related Allowance	0		0
Average Recorded Investment	638		980
Interest Income Recognized	0		68
Total commercial
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	104,367		71,899
Unpaid Principal Balance	134,554		98,279
Related Allowance	23,076		5,848
Average Recorded Investment	75,853		82,307
Interest Income Recognized	1,214		1,065
Total commercial | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	86,724		44,136
Unpaid Principal Balance	98,015		45,612
Related Allowance	23,076		5,848
Average Recorded Investment	51,343		56,000
Interest Income Recognized	1,186		1,341
Total commercial | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	17,642		27,763
Unpaid Principal Balance	36,539		52,667
Related Allowance	0		0
Average Recorded Investment	24,511		26,307
Interest Income Recognized	28		276
Residential mortgage
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	56,272		50,486
Unpaid Principal Balance	59,694		54,223
Related Allowance	5,693		6,023
Average Recorded Investment	54,136		51,477
Interest Income Recognized	1,168		1,992
Residential mortgage | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	45,856		41,691
Unpaid Principal Balance	49,110		45,149
Related Allowance	5,693		6,023
Average Recorded Investment	45,953		42,687
Interest Income Recognized	991		1,789
Residential mortgage | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	10,416		8,795
Unpaid Principal Balance	10,584		9,074
Related Allowance	0		0
Average Recorded Investment	8,183		8,790
Interest Income Recognized	178		203
Home equity
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	10,626		10,124
Unpaid Principal Balance	11,636		11,081
Related Allowance	3,233		3,312
Average Recorded Investment	11,042		10,739
Interest Income Recognized	251		566
Home equity | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	9,609		9,601
Unpaid Principal Balance	10,600		10,539
Related Allowance	3,233		3,312
Average Recorded Investment	11,042		10,209
Interest Income Recognized	240		566
Home equity | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,017		523
Unpaid Principal Balance	1,036		542
Related Allowance	0		0
Average Recorded Investment	0		530
Interest Income Recognized	11		0
Other consumer
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,225		1,181
Unpaid Principal Balance	1,227		1,183
Related Allowance	185		121
Average Recorded Investment	1,227		1,184
Interest Income Recognized	0		3
Other consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	1,225		1,181
Unpaid Principal Balance	1,227		1,183
Related Allowance	185		121
Average Recorded Investment	1,227		1,184
Interest Income Recognized	0		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	68,122		61,791
Unpaid Principal Balance	72,557		66,487
Related Allowance	9,112		9,456
Average Recorded Investment	66,405		63,400
Interest Income Recognized	1,420		2,561
Total consumer | Loans with a related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	56,690		52,473
Unpaid Principal Balance	60,938		56,871
Related Allowance	9,112		9,456
Average Recorded Investment	58,222		54,080
Interest Income Recognized	1,231		2,358
Total consumer | Loans with no related allowance
Loan and Lease Receivables, Impaired [Abstract]
Recorded Investment	11,432		9,318
Unpaid Principal Balance	11,620		9,616
Related Allowance	0		0
Average Recorded Investment	8,183		9,320
Interest Income Recognized	$ 189		$ 203

[1] (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 68% of the unpaid principal balance at June 30, 2019.

[2] (a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 72% of the unpaid principal balance at December 31, 2018.