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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Schedule of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 125,436	$ 159,905	$ 144,176	$ 56,379
Charge-offs	(8,755)	(21,946)	(31,361)	(52,212)
Recoveries	1,651	4,647	5,145	5,877
Provision (benefit) for credit losses	13,164	12,955	13,536	65,688
Ending balance	131,496	155,561	131,496	155,561
Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5,028	14,697	12,620	6,157
Charge-offs	0	0	(1,132)	0
Recoveries	0	0	0	0
Provision (benefit) for credit losses	(631)	329	(7,091)	6,698
Ending balance	4,397	15,026	4,397	15,026
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	8,127	12,302	12,239	15,556
Charge-offs	(516)	(2,527)	(1,153)	(2,645)
Recoveries	400	2,582	945	2,661
Provision (benefit) for credit losses	2,849	569	(1,171)	(3,405)
Ending balance	10,860	12,926	10,860	12,926
Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,464	11,405	9,512	2,235
Charge-offs	(524)	(44)	(666)	(44)
Recoveries	474	0	483	5
Provision (benefit) for credit losses	(797)	(1,809)	(5,712)	1,583
Ending balance	3,617	9,552	3,617	9,552
Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	7,374	26,493	19,452	6,243
Charge-offs	(943)	(10,181)	(943)	(25,779)
Recoveries	0	1,258	69	1,258
Provision (benefit) for credit losses	944	2,630	(11,203)	30,560
Ending balance	7,375	20,200	7,375	20,200
Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,643	5,297	5,871	1,262
Charge-offs	0	0	0	0
Recoveries	3	6	122	122
Provision (benefit) for credit losses	(1,760)	1,120	(5,107)	5,137
Ending balance	886	6,423	886	6,423
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,299	4,550	3,977	3,218
Charge-offs	(79)	0	(129)	0
Recoveries	25	17	47	72
Provision (benefit) for credit losses	(333)	82	(1,983)	(159)
Ending balance	1,912	4,649	1,912	4,649
Manufactured housing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,372	6,014	5,190	1,060
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (benefit) for credit losses	38	(389)	(780)	763
Ending balance	4,410	5,625	4,410	5,625
Installment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	91,129	79,147	75,315	20,648
Charge-offs	(6,693)	(9,194)	(27,338)	(23,744)
Recoveries	749	784	3,479	1,759
Provision (benefit) for credit losses	12,854	10,423	46,583	24,511
Ending balance	$ 98,039	$ 81,160	$ 98,039	81,160
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				79,829
Cumulative Effect, Period of Adoption, Adjustment | Multi-family
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				2,171
Cumulative Effect, Period of Adoption, Adjustment | Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				759
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				5,773
Cumulative Effect, Period of Adoption, Adjustment | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				7,918
Cumulative Effect, Period of Adoption, Adjustment | Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				(98)
Cumulative Effect, Period of Adoption, Adjustment | Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				1,518
Cumulative Effect, Period of Adoption, Adjustment | Manufactured housing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				3,802
Cumulative Effect, Period of Adoption, Adjustment | Installment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				$ 57,986

X

- Definition

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

+ References

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-Publisher FASB
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