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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Investment | Dec. 31, 2017 USD ($) Investment | Dec. 31, 2016 USD ($) Investment
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 22 | 71 | 13
Pre-Modification Recorded Investment | $ 8,663 | $ 61,641 | $ 14,937
Post-Modification Recorded Investment | 6,355 | 36,047 | 13,100
Trouble debt restructuring, charge-off amount | $ 2,308 | 14,273 | 170
Capitalized interest |  | $ 12 | $ 11
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
Pre-Modification Recorded Investment |  | $ 810 | $ 900
Post-Modification Recorded Investment |  | $ 986 | $ 1,036
Weighted Average Interest Rate, Pre-Modification |  | 5.93% | 4.26%
Weighted Average Interest Rate, Post-Modification |  | 2.21% | 2.65%
Capitalized interest |  | $ 12 | $ 11
Commercial and Industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 21 | 65 | 7
Pre-Modification Recorded Investment | $ 7,763 | $ 52,179 | $ 4,697
Post-Modification Recorded Investment | $ 5,455 | $ 26,409 | $ 3,935
Weighted Average Interest Rate, Pre-Modification | 3.25% | 3.36% | 3.22%
Weighted Average Interest Rate, Post-Modification | 3.13% | 3.29% | 3.19%
Trouble debt restructuring, charge-off amount | $ 2,308 | $ 14,273 | $ 170
Acquisition, development, and construction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 1 | 2 |
Pre-Modification Recorded Investment | $ 900 | $ 8,652 |
Post-Modification Recorded Investment | $ 900 | $ 8,652 |
Weighted Average Interest Rate, Pre-Modification | 4.50% | 5.50% |
Weighted Average Interest Rate, Post-Modification | 4.50% | 5.50% |

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