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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Schedule of Loan Purchases and Sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 652,176	$ 15,700	$ 1,389,512	$ 225,963
Sales	$ 130,350	$ 21,568	$ 260,851	$ 23,390
Purchase price as a percentage of loans outstanding	99.20%	98.10%	101.00%	100.20%
Net gain on sale of loans	$ 5,800	$ 300	$ 10,100	$ 300
Loans receivable, PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	602,175	0	1,223,662	0
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	0	0	19,443	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	6,176	3,968	35,166	3,968
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	5,728	0	12,426	0
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	0	17,600	18,366	17,600
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0	0	495
Sales	14,549	0	42,735	0
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	50,001	15,700	165,850	225,468
Sales	$ 103,897	$ 0	$ 132,715	$ 1,822

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447

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