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Loans and Leases Receivable and Allowance for Credit Losses - Schedule of Loan Purchases and Sales (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 115,849	$ 192,256
Sales	$ 39,534	$ 1,822
Purchase price as a percentage of loans outstanding	101.00%	100.60%
Net gain on sale of loans	$ 1,600	$ 11
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	0	495
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	115,849	191,761
Sales	0	1,822
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	18,931	0
Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	2,237	0
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	$ 18,366	$ 0

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Loans Held-for-investment, Purchase Price as a Percentage of Loans Outstanding

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Amount of increase from purchase of financing receivable.

+ 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=121599337&loc=SL82919244-210447

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Amount of decrease from sale and reclassification to held-for-sale of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
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-Publisher FASB
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-SubTopic 20
-Section 50
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