Allowance for Loan and Lease Losses and Credit Quality - Balance Of Impaired Loans and Leases With and Without Allowances (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	$ 321,172		$ 321,172		$ 175,828
Loan and Lease Balance	244,459		244,459		151,593
Related Allowance Recorded	24,758		24,758		30,047
Average Loan and Lease Balance	229,887	$ 140,902	198,026	$ 155,444
Interest Income Recognized	1,674	1,111	4,846	3,998
Impaired Loans With Valuation Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	155,750		155,750		131,658
Loan and Lease Balance	147,675		147,675		123,455
Related Allowance Recorded	24,758		24,758		30,047
Average Loan and Lease Balance	147,581	115,762	135,565	129,258
Interest Income Recognized	973	730	2,814	2,798
Impaired Loans With Valuation Allowance | Commercial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	43,508		43,508		40,349
Loan and Lease Balance	40,200		40,200		36,800
Related Allowance Recorded	8,212		8,212		7,462
Average Loan and Lease Balance	39,215	28,109	38,500	29,694
Interest Income Recognized	109	49	269	251
Impaired Loans With Valuation Allowance | Commercial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	27,748		27,748		35,444
Loan and Lease Balance	24,775		24,775		32,326
Related Allowance Recorded	5,151		5,151		6,354
Average Loan and Lease Balance	22,845	22,917	28,551	15,213
Interest Income Recognized	3	49	32	251
Impaired Loans With Valuation Allowance | Commercial | Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	4,257		4,257		4,905
Loan and Lease Balance	3,922		3,922		4,474
Related Allowance Recorded	330		330		1,108
Average Loan and Lease Balance	4,175	5,192	4,198	5,929
Interest Income Recognized	51	0	120	0
Impaired Loans With Valuation Allowance | Commercial | Lease financing
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	11,503		11,503		0
Loan and Lease Balance	11,503		11,503		0
Related Allowance Recorded	2,731		2,731		0
Average Loan and Lease Balance	12,195	0	5,751	8,552
Interest Income Recognized	55	0	117	0
Impaired Loans With Valuation Allowance | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	112,242		112,242		91,309
Loan and Lease Balance	107,475		107,475		86,655
Related Allowance Recorded	16,546		16,546		22,585
Average Loan and Lease Balance	108,366	87,653	97,065	99,564
Interest Income Recognized	864	681	2,545	2,547
Impaired Loans With Valuation Allowance | Consumer | Residential mortgage
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	81,658		81,658		63,004
Loan and Lease Balance	78,247		78,247		60,172
Related Allowance Recorded	13,630		13,630		17,216
Average Loan and Lease Balance	77,852	60,737	69,209	69,268
Interest Income Recognized	770	380	1,864	1,221
Impaired Loans With Valuation Allowance | Consumer | Consumer installment
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	0		0		919
Loan and Lease Balance	0		0		647
Related Allowance Recorded	0		0		81
Average Loan and Lease Balance	289	454	324	713
Interest Income Recognized	0	0	0	0
Impaired Loans With Valuation Allowance | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	30,584		30,584		27,386
Loan and Lease Balance	29,228		29,228		25,836
Related Allowance Recorded	2,916		2,916		5,288
Average Loan and Lease Balance	30,225	26,462	27,532	29,583
Interest Income Recognized	94	301	681	1,326
Impaired Loans With No Valuation Allowance
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	165,422		165,422		44,170
Loan and Lease Balance	96,784		96,784		28,138
Related Allowance Recorded	0		0		0
Average Loan and Lease Balance	82,306	25,140	62,461	26,186
Interest Income Recognized	701	381	2,032	1,200
Impaired Loans With No Valuation Allowance | Commercial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	119,353		119,353		6,514
Loan and Lease Balance	71,359		71,359		6,445
Related Allowance Recorded	0		0		0
Average Loan and Lease Balance	59,670	4,718	38,902	5,895
Interest Income Recognized	474	89	1,216	310
Impaired Loans With No Valuation Allowance | Commercial | Commercial and industrial
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	56,284		56,284		2,239
Loan and Lease Balance	36,409		36,409		2,237
Related Allowance Recorded	0		0		0
Average Loan and Lease Balance	20,448	403	19,323	1,510
Interest Income Recognized	37	31	129	136
Impaired Loans With No Valuation Allowance | Commercial | Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	63,069		63,069		4,275
Loan and Lease Balance	34,950		34,950		4,208
Related Allowance Recorded	0		0		0
Average Loan and Lease Balance	39,222	4,315	19,579	4,385
Interest Income Recognized	437	58	1,087	174
Impaired Loans With No Valuation Allowance | Commercial | Lease financing
Financing Receivable, Impaired [Line Items]
Average Loan and Lease Balance	0	0	0	0
Interest Income Recognized	0	0	0	0
Impaired Loans With No Valuation Allowance | Consumer
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	46,069		46,069		37,656
Loan and Lease Balance	25,425		25,425		21,693
Related Allowance Recorded	0		0		0
Average Loan and Lease Balance	22,636	20,422	23,559	20,291
Interest Income Recognized	227	292	816	890
Impaired Loans With No Valuation Allowance | Consumer | Residential mortgage
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	27,420		27,420		11,636
Loan and Lease Balance	19,370		19,370		9,494
Related Allowance Recorded	0		0		0
Average Loan and Lease Balance	12,609	9,982	14,431	10,013
Interest Income Recognized	121	160	450	502
Impaired Loans With No Valuation Allowance | Consumer | Consumer installment
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	1,878		1,878		15,400
Loan and Lease Balance	635		635		10,770
Related Allowance Recorded	0		0		0
Average Loan and Lease Balance	6,476	8,757	5,703	8,630
Interest Income Recognized	83	77	256	211
Impaired Loans With No Valuation Allowance | Consumer | Home equity
Financing Receivable, Impaired [Line Items]
Unpaid Contractual Balance	16,771		16,771		10,620
Loan and Lease Balance	5,420		5,420		1,429
Related Allowance Recorded	0		0		$ 0
Average Loan and Lease Balance	3,551	1,683	3,425	1,648
Interest Income Recognized	$ 23	$ 55	$ 110	$ 177