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Summary of Financial Effects of Troubled Debt Restructurings (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) Investment | Sep. 30, 2017 USD ($) Investment | Sep. 30, 2018 USD ($) Investment | Sep. 30, 2017 USD ($) Investment
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 24 | 19 | 58
Pre-Modification Recorded Investment |  | $ 26,654 | $ 7,814 | $ 58,178
Post-Modification Recorded Investment |  | 16,272 | 5,286 | 33,315
Trouble debt restructuring, charge-off amount |  | $ 6,350 | $ 2,308 | 11,079
Capitalized interest |  |  |  | $ 12
Acquisition, Development and Construction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 2 | 1 | 2
Pre-Modification Recorded Investment |  | $ 8,652 | $ 900 | $ 8,652
Post-Modification Recorded Investment |  | $ 8,652 | $ 900 | $ 8,652
Weighted Average Interest Rate, Pre-Modification |  | 5.50% | 4.50% | 5.50%
Weighted Average Interest Rate, Post-Modification |  | 5.50% | 4.50% | 5.50%
Commercial and Industrial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 6 | 22 | 18 | 52
Pre-Modification Recorded Investment | $ 1,848 | $ 18,002 | $ 6,914 | $ 48,716
Post-Modification Recorded Investment | $ 1,212 | $ 7,620 | $ 4,386 | $ 23,673
Weighted Average Interest Rate, Pre-Modification | 3.36% | 3.18% | 3.30% | 3.36%
Weighted Average Interest Rate, Post-Modification | 3.28% | 2.91% | 3.18% | 3.29%
Trouble debt restructuring, charge-off amount | $ 545 | $ 6,350 | $ 2,308 | $ 11,079
One-to-four family |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  |  | 4
Pre-Modification Recorded Investment |  |  |  | $ 810
Post-Modification Recorded Investment |  |  |  | $ 990
Weighted Average Interest Rate, Pre-Modification |  |  |  | 5.93%
Weighted Average Interest Rate, Post-Modification |  |  |  | 2.21%
Capitalized interest |  |  |  | $ 12

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