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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) Loan	Sep. 30, 2020 USD ($) Loan	Sep. 30, 2021 USD ($) Loan	Sep. 30, 2020 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	43	67	174	105
Recorded investment | $	$ 931	$ 1,473	$ 2,954	$ 3,231
Extensions of maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	0	0	0	6
Recorded investment | $	$ 0	$ 0	$ 0	$ 385
Interest-rate reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	4	2	16	34
Recorded investment | $	$ 244	$ 88	$ 585	$ 1,461
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	39	65	158	65
Recorded investment | $	$ 687	$ 1,385	$ 2,369	$ 1,385

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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=123577603&loc=SL6953676-111524

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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=123577603&loc=SL6953676-111524

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