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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		6 Months Ended
	Jun. 30, 2021 USD ($) Loan	Jun. 30, 2020 USD ($) Loan	Jun. 30, 2021 USD ($) Loan	Jun. 30, 2020 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	103	22	131	38
Recorded investment | $	$ 1,298	$ 983	$ 2,023	$ 1,758
Extensions of maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	0	2	0	6
Recorded investment | $	$ 0	$ 140	$ 0	$ 385
Interest-rate reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	4	20	12	32
Recorded investment | $	$ 157	$ 843	$ 341	$ 1,373
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan	99	0	119	0
Recorded investment | $	$ 1,141	$ 0	$ 1,682	$ 0

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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=123577603&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=123577603&loc=SL6953676-111524

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