Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017 Loan	Jun. 30, 2016 USD ($) Loan	Jun. 30, 2017 USD ($) Loan	Jun. 30, 2016 USD ($) Loan
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan	0	4	2	8
Pre-Modification Outstanding Recorded Investment		$ 4,207	$ 190	$ 4,534
Post-Modification Recorded Investment		$ 4,212	$ 199	$ 4,557
Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan		1		2
Pre-Modification Outstanding Recorded Investment		$ 4,000		$ 4,088
Post-Modification Recorded Investment		$ 4,000		$ 4,088
Commercial Loans [Member] \| Nonresidential [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan		1		2
Pre-Modification Outstanding Recorded Investment		$ 4,000		$ 4,088
Post-Modification Recorded Investment		$ 4,000		$ 4,088
Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan		1	1	3
Pre-Modification Outstanding Recorded Investment		$ 97	$ 75	$ 316
Post-Modification Recorded Investment		$ 98	$ 84	$ 335
Residential Mortgage Loans [Member] \| One-to Four-Family [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan		1	1	3
Pre-Modification Outstanding Recorded Investment		$ 97	$ 75	$ 316
Post-Modification Recorded Investment		$ 98	$ 84	$ 335
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan		2	1	3
Pre-Modification Outstanding Recorded Investment		$ 110	$ 115	$ 130
Post-Modification Recorded Investment		$ 114	$ 115	$ 134
Consumer Loans [Member] \| Home Equity [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan		2		3
Pre-Modification Outstanding Recorded Investment		$ 110		$ 130
Post-Modification Recorded Investment		$ 114		$ 134
Consumer Loans [Member] \| Recreational Vehicle [Member]
Financing Receivable Modifications [Line Items]
Number of Loans \| Loan			1
Pre-Modification Outstanding Recorded Investment			$ 115
Post-Modification Recorded Investment			$ 115

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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