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Loans and Leases Receivable and Allowance for Credit Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (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 loans | Loan	121	28	41
Recorded investment | $	$ 3,677	$ 1,437	$ 1,675
Extensions of maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	6	2	2
Recorded investment | $	$ 385	$ 514	$ 60
Interest-rate reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	35	26	39
Recorded investment | $	$ 1,479	$ 923	$ 1,615
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	80	0	0
Recorded investment | $	$ 1,813	$ 0	$ 0

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+ References

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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