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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) Investment | Jun. 30, 2017 USD ($) Investment | Jun. 30, 2018 USD ($) Investment | Jun. 30, 2017 USD ($) Investment
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 16 | 13 | 34
Pre-Modification Recorded Investment |  | $ 23,296 | $ 6,680 | $ 31,523
Post-Modification Recorded Investment |  | 19,379 | 4,074 | 24,145
Trouble debt restructuring, charge-off amount |  | 825 | $ 2,476 | 4,104
Capitalized interest |  | $ 7 |  | $ 12
Acquisition, Development and Construction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 1 |
Pre-Modification Recorded Investment |  |  | $ 900 |
Post-Modification Recorded Investment |  |  | $ 900 |
Weighted Average Interest Rate, Pre-Modification |  |  | 4.50% |
Weighted Average Interest Rate, Post-Modification |  |  | 4.50% |
Commercial and Industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 6 | 13 | 12 | 30
Pre-Modification Recorded Investment | $ 2,613 | $ 22,752 | $ 5,780 | $ 30,714
Post-Modification Recorded Investment | $ 1,420 | $ 18,722 | $ 3,174 | $ 23,151
Weighted Average Interest Rate, Pre-Modification | 3.27% | 3.49% | 3.27% | 3.45%
Weighted Average Interest Rate, Post-Modification | 3.05% | 3.45% | 3.14% | 3.45%
Trouble debt restructuring, charge-off amount | $ 1,158 | $ 825 | $ 2,476 | $ 4,104
One-to-four family |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 3 |  |
Pre-Modification Recorded Investment |  | $ 544 |  |
Post-Modification Recorded Investment |  | $ 657 |  |
Weighted Average Interest Rate, Pre-Modification |  | 5.90% |  |
Weighted Average Interest Rate, Post-Modification |  | 2.00% |  |
Capitalized interest |  | $ 7 |  |
Multi-Family |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  |  | 4
Pre-Modification Recorded Investment |  |  |  | $ 809
Post-Modification Recorded Investment |  |  |  | $ 994
Weighted Average Interest Rate, Pre-Modification |  |  |  | 5.93%
Weighted Average Interest Rate, Post-Modification |  |  |  | 2.21%
Capitalized interest |  |  |  | $ 12

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