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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Analysis of Loans Modified in Troubled Debt Restructuring by Type of Concession (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Loan	Mar. 31, 2018 USD ($) Loan
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	12	9
Recorded Investment | $	$ 899	$ 322
Extensions of maturity
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	2	0
Recorded Investment | $	$ 514	$ 0
Interest-rate reductions
Financing Receivable, Modifications [Line Items]
Number of Loans | Loan	10	9
Recorded Investment | $	$ 385	$ 322

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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.

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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