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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		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 15,700	$ 83,898	$ 225,963	$ 640,008
Sales	$ 21,568	$ 0	$ 23,390	$ 0
Purchase price as a percentage of loans outstanding	98.10%	96.30%	100.20%	99.40%
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 0	$ 0	$ 495	$ 105,858
Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	17,600	0	17,600	0
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	15,700	83,898	225,468	534,150
Sales	$ 0	$ 0	$ 1,822	$ 0

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- Definition

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

+ References

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- Definition

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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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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
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447

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-Topic 310
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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