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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Investment | Dec. 31, 2015 USD ($) Investment | Dec. 31, 2014 USD ($) Investment
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 13 | 8 | 8
Trouble debt restructuring, charge-off amount | $ | $ 170 | $ 33 | $ 352
Capitalized interest | $ | $ 11 | $ 8 | $ 22
Multi-Family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 1 |  | 2
Weighted Average Interest Rate, Pre-Modification | 4.63% |  | 5.61%
Weighted Average Interest Rate, Post-Modification | 4.00% |  | 5.61%
One-to-four family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 5 | 4 | 1
Weighted Average Interest Rate, Pre-Modification | 4.26% | 4.02% | 5.75%
Weighted Average Interest Rate, Post-Modification | 2.65% | 2.72% | 4.27%
Trouble debt restructuring, charge-off amount | $ |  |  | $ 18
Capitalized interest | $ | $ 11 | $ 6 | $ 22
Commercial and Industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 7 | 2 | 1
Weighted Average Interest Rate, Pre-Modification | 3.22% | 3.40% | 5.00%
Weighted Average Interest Rate, Post-Modification | 3.19% | 3.52% | 5.00%
Trouble debt restructuring, charge-off amount | $ | $ 170 | $ 33 |
Other loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 2 |
Weighted Average Interest Rate, Pre-Modification |  | 4.58% |
Weighted Average Interest Rate, Post-Modification |  | 2.00% |
Capitalized interest | $ |  | $ 2 |
Commercial Real Estate |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 2
Weighted Average Interest Rate, Pre-Modification |  |  | 6.71%
Weighted Average Interest Rate, Post-Modification |  |  | 5.54%
Trouble debt restructuring, charge-off amount | $ |  |  | $ 334
Acquisition, Development and Construction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 2
Weighted Average Interest Rate, Pre-Modification |  |  | 7.00%
Weighted Average Interest Rate, Post-Modification |  |  | 7.00%

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- Definition 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=66008989&loc=SL6953676-111524 + Details
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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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