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Loans and Leases Receivable and Allowance for Credit Losses - Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) Loan	Mar. 31, 2020 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	20	6
Recorded Investment | $	$ 354	$ 692
Manufactured housing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	3	0
Recorded Investment | $	$ 48	$ 0
Commercial real estate owner occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	0	1
Recorded Investment | $	$ 0	$ 8
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	1	5
Recorded Investment | $	$ 56	$ 684
Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	16	0
Recorded Investment | $	$ 250	$ 0

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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