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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Investment | Dec. 31, 2016 USD ($) Investment | Dec. 31, 2015 USD ($) Investment
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 71 | 13 | 8,000
Pre-Modification Recorded Investment | $ 61,641 | $ 14,937 | $ 2,106
Post-Modification Recorded Investment | 36,047 | 13,100 | 2,144
Trouble debt restructuring, charge-off amount | 14,273 | 170 | 33
Capitalized interest | $ 12 | $ 11 | $ 8
Multi-Family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 1 |
Pre-Modification Recorded Investment |  | $ 9,340 |
Post-Modification Recorded Investment |  | $ 8,129 |
Weighted Average Interest Rate, Pre-Modification |  | 4.63% |
Weighted Average Interest Rate, Post-Modification |  | 4.00% |
One-to-four family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 4 | 5 | 4,000
Pre-Modification Recorded Investment | $ 810 | $ 900 | $ 568
Post-Modification Recorded Investment | $ 986 | $ 1,036 | $ 619
Weighted Average Interest Rate, Pre-Modification | 5.93% | 4.26% | 4.02%
Weighted Average Interest Rate, Post-Modification | 2.21% | 2.65% | 2.72%
Capitalized interest | $ 12 | $ 11 | $ 6
Commercial and Industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 65 | 7 | 2,000
Pre-Modification Recorded Investment | $ 52,179 | $ 4,697 | $ 1,345
Post-Modification Recorded Investment | $ 26,409 | $ 3,935 | $ 1,312
Weighted Average Interest Rate, Pre-Modification | 3.36% | 3.22% | 3.40%
Weighted Average Interest Rate, Post-Modification | 3.26% | 3.19% | 3.52%
Trouble debt restructuring, charge-off amount | $ 14,273 | $ 170 | $ 33
Other loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 2,000
Pre-Modification Recorded Investment |  |  | $ 193
Post-Modification Recorded Investment |  |  | $ 213
Weighted Average Interest Rate, Pre-Modification |  |  | 4.58%
Weighted Average Interest Rate, Post-Modification |  |  | 2.00%
Capitalized interest |  |  | $ 2
Acquisition, Development and Construction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 2 |  |
Pre-Modification Recorded Investment | $ 8,652 |  |
Post-Modification Recorded Investment | $ 8,652 |  |
Weighted Average Interest Rate, Pre-Modification | 5.50% |  |
Weighted Average Interest Rate, Post-Modification | 5.50% |  |

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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=84173941&loc=SL6953676-111524 + Details
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