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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 460,456	$ 18,008	$ 737,336	$ 210,263
Sales	$ 74,404	$ 0	$ 130,501	$ 1,822
Purchase price as a percentage of loans outstanding	102.00%	98.50%	103.00%	100.40%
Net gain on sale of loans	$ 2,200	$ 300	$ 4,300	$ 400
Loans receivable, PPP
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	460,456	0	621,487	0
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	19,443	0	19,443	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	10,059	0	28,990	0
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	4,461	0	6,698	0
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	0	0	18,366	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	0	0	495
Sales	11,623	0	28,186	0
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	18,008	115,849	209,768
Sales	$ 28,818	$ 0	$ 28,818	$ 1,822

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+ References

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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