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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		3 Months Ended
	Mar. 31, 2020 derivative	Mar. 31, 2020 USD ($) Loan	Mar. 31, 2019 USD ($) Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans	12	16	12
Recorded investment		$ 775	$ 899
Extensions of maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan		4	2
Recorded investment		$ 245	$ 514
Interest-rate reductions
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of loans | Loan		12	10
Recorded investment		$ 530	$ 385

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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=118936363&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=118936363&loc=SL6953676-111524

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