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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	12 Months Ended
	Dec. 31, 2020 USD ($) Loan	Dec. 31, 2019 USD ($) Loan	Dec. 31, 2018 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDR loans that defaulted on payments | Loan	24	4	4
Recorded investment | $	$ 614	$ 154	$ 92
Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDR loans that defaulted on payments | Loan	15	0	0
Recorded investment | $	$ 226	$ 0	$ 0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDR loans that defaulted on payments | Loan	3	1	0
Recorded investment | $	$ 152	$ 81	$ 0
Manufactured housing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDR loans that defaulted on payments | Loan	6	3	4
Recorded investment | $	$ 236	$ 73	$ 92

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- Definition

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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