Loans and Allowance for Credit Losses for Loans - Summary of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan losses:
Beginning balance	$ 340,243	$ 161,759
Allowance for purchased credit deteriorated (PCD) loans	6,542
Loans charged-off	(26,332)	(45,289)
Charged-off loans recovered	11,242	7,320
Net (charge-offs) recoveries	(15,090)	(37,969)
(Credit) provision for loan losses	27,507	123,922	$ 25,809
Ending balance	359,202	340,243	161,759
Allowance for PCD loans reclassification			61,600
Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		92,531
Ending balance			92,531
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance		254,290
Ending balance			254,290
Commercial and industrial *
Allowance for loan losses:
Beginning balance	131,070	104,059
Allowance for purchased credit deteriorated (PCD) loans	3,528
Loans charged-off	(21,507)	(34,630)
Charged-off loans recovered	3,934	1,956
Net (charge-offs) recoveries	(17,573)	(32,674)
(Credit) provision for loan losses	(13,935)	44,516
Ending balance	103,090	131,070	104,059
Commercial and industrial * \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		15,169
Ending balance			15,169
Commercial and industrial * \| Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance		119,228
Ending balance			119,228
Commercial real estate
Allowance for loan losses:
Beginning balance	164,113	45,673
Allowance for purchased credit deteriorated (PCD) loans	2,953
Loans charged-off	(382)	(767)
Charged-off loans recovered	2,557	1,506
Net (charge-offs) recoveries	2,175	739
(Credit) provision for loan losses	48,249	67,904
Ending balance	217,490	164,113	45,673
Commercial real estate \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		49,797
Ending balance			49,797
Commercial real estate \| Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance		95,470
Ending balance			95,470
Residential Mortgage
Allowance for loan losses:
Beginning balance	28,873	5,060
Allowance for purchased credit deteriorated (PCD) loans	57
Loans charged-off	(140)	(598)
Charged-off loans recovered	676	670
Net (charge-offs) recoveries	536	72
(Credit) provision for loan losses	(4,346)	3,166
Ending balance	25,120	28,873	5,060
Residential Mortgage \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		20,575
Ending balance			20,575
Residential Mortgage \| Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance		25,635
Ending balance			25,635
Consumer
Allowance for loan losses:
Beginning balance	16,187	6,967
Allowance for purchased credit deteriorated (PCD) loans	4
Loans charged-off	(4,303)	(9,294)
Charged-off loans recovered	4,075	3,188
Net (charge-offs) recoveries	(228)	(6,106)
(Credit) provision for loan losses	(2,461)	8,336
Ending balance	$ 13,502	16,187	6,967
Consumer \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses:
Beginning balance		6,990
Ending balance			6,990
Consumer \| Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses:
Beginning balance		$ 13,957
Ending balance			$ 13,957

Amount excluding accrued interest, of allowance for credit loss on financing receivable.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
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