Loans and Allowance for Credit Losses Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 277,567
Beginning balance	291,940	$ 166,209	$ 169,410
Loans charged off	30,952	30,557
Recoveries of loans previously charged off	17,146	21,020
Net loans recovered (charged off)			(36,026)
Provision for credit losses	(14,600)	76,920
Ending balance	263,534	291,940	166,209
Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		163,622
Beginning balance	277,567
Loans charged off	30,952	30,557
Recoveries of loans previously charged off	17,146	21,020
Net loans recovered (charged off)	(13,806)	(9,537)
Provision for credit losses	(14,760)	77,759
Ending balance	249,001	277,567
Real estate - commercial mortgage | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		45,610
Beginning balance	103,425
Loans charged off	8,726	4,225
Recoveries of loans previously charged off	2,474	1,027
Net loans recovered (charged off)	(6,252)	(3,198)
Provision for credit losses	(9,203)	31,652
Ending balance	87,970	103,425
Commercial and industrial | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		68,602
Beginning balance	74,771
Loans charged off	15,337	18,915
Recoveries of loans previously charged off	9,587	11,396
Net loans recovered (charged off)	(5,750)	(7,519)
Provision for credit losses	(1,965)	32,264
Ending balance	67,056	74,771
Real estate - home equity | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		17,744
Beginning balance	14,232
Loans charged off	676	1,193
Recoveries of loans previously charged off	248	504
Net loans recovered (charged off)	(428)	(689)
Provision for credit losses	(2,595)	(2,758)
Ending balance	11,209	14,232
Real estate - residential mortgage | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		19,771
Beginning balance	51,995
Loans charged off	1,290	620
Recoveries of loans previously charged off	375	491
Net loans recovered (charged off)	(915)	(129)
Provision for credit losses	3,156	11,118
Ending balance	54,236	51,995
Real-estate - construction | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		4,443
Beginning balance	15,608
Loans charged off	39	17
Recoveries of loans previously charged off	1,412	5,122
Net loans recovered (charged off)	1,373	5,105
Provision for credit losses	(4,040)	2,045
Ending balance	12,941	15,608
Consumer | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		3,762
Beginning balance	10,905
Loans charged off	2,633	3,400
Recoveries of loans previously charged off	2,097	1,875
Net loans recovered (charged off)	(536)	(1,525)
Provision for credit losses	(1,829)	2,699
Ending balance	8,540	10,905
Equipment lease financing and other | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		3,690
Beginning balance	6,631
Loans charged off	2,251	2,187
Recoveries of loans previously charged off	953	605
Net loans recovered (charged off)	(1,298)	(1,582)
Provision for credit losses	1,716	739
Ending balance	$ 7,049	6,631
Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		58,348
Ending balance			58,348
Cumulative Effect, Period of Adoption, Adjustment | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		45,723
Ending balance			45,723
Cumulative Effect, Period of Adoption, Adjustment | Real estate - commercial mortgage | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		29,361
Ending balance			29,361
Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		(18,576)
Ending balance			(18,576)
Cumulative Effect, Period of Adoption, Adjustment | Real estate - home equity | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		(65)
Ending balance			(65)
Cumulative Effect, Period of Adoption, Adjustment | Real estate - residential mortgage | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		21,235
Ending balance			21,235
Cumulative Effect, Period of Adoption, Adjustment | Real-estate - construction | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		4,015
Ending balance			4,015
Cumulative Effect, Period of Adoption, Adjustment | Consumer | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		5,969
Ending balance			5,969
Cumulative Effect, Period of Adoption, Adjustment | Equipment lease financing and other | Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		$ 3,784
Ending balance			$ 3,784