Loans - Loans by Class Modified as Troubled Debt Restructurings (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	1	1
Pre-Modification Outstanding Recorded Investment	$ 335	$ 124
Post-Modification Recorded Investment	$ 355	$ 124
Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan		1
Pre-Modification Outstanding Recorded Investment		$ 124
Post-Modification Recorded Investment		$ 124
Commercial Loans [Member] \| Nonresidential [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan		1
Pre-Modification Outstanding Recorded Investment		$ 124
Post-Modification Recorded Investment		$ 124
Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan	1
Pre-Modification Outstanding Recorded Investment	$ 335
Post-Modification Recorded Investment	$ 355
Residential Mortgage Loans [Member] \| One-to Four-Family [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan	1
Pre-Modification Outstanding Recorded Investment	$ 335
Post-Modification Recorded Investment	$ 355

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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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