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Additional Information about Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 36,399 | $ 51,954
Impaired loans with no related allowance, Unpaid Principal Balance | 55,723 | 61,617
Impaired loans with no related allowance, Average Recorded Investment | 34,782 | 67,805
Impaired loans with no related allowance, Interest Income Recognized | 1,400 | 2,044
Impaired loans with an allowance recorded, Recorded Investment | 11,853 |
Impaired loans with an allowance recorded, Unpaid Principal Balance | 13,529 |
Impaired loans with an allowance recorded, Related Allowance | 577 |
Impaired loans with an allowance recorded, Average Recorded Investment | 4,574 |
Impaired loans with an allowance recorded, Interest Income Recognized | 213 |
Total impaired loans, Recorded Investment | 48,252 |
Total impaired loans, Unpaid Principal Balance | 69,252 |
Total impaired loans, Related Allowance | 577 |
Total impaired loans, Average Recorded Investment | 39,356 |
Total impaired loans, Interest Income Recognized | 1,613 |
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 10,742 | 27,464
Impaired loans with no related allowance, Unpaid Principal Balance | 13,133 | 29,379
Impaired loans with no related allowance, Average Recorded Investment | 11,431 | 30,965
Impaired loans with no related allowance, Interest Income Recognized | 627 | 1,320
Total impaired loans, Recorded Investment | 10,742 |
Total impaired loans, Unpaid Principal Balance | 13,133 |
Total impaired loans, Average Recorded Investment | 11,431 |
Total impaired loans, Interest Income Recognized | 627 |
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 9,117 | 13,995
Impaired loans with no related allowance, Unpaid Principal Balance | 14,868 | 15,480
Impaired loans with no related allowance, Average Recorded Investment | 10,461 | 25,066
Impaired loans with no related allowance, Interest Income Recognized | 143 | 383
Total impaired loans, Recorded Investment | 9,117 |
Total impaired loans, Unpaid Principal Balance | 14,868 |
Total impaired loans, Average Recorded Investment | 10,461 |
Total impaired loans, Interest Income Recognized | 143 |
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 3,601 | 3,384
Impaired loans with no related allowance, Unpaid Principal Balance | 4,267 | 8,929
Impaired loans with no related allowance, Average Recorded Investment | 3,079 | 2,302
Impaired loans with no related allowance, Interest Income Recognized | 124 | 75
Total impaired loans, Recorded Investment | 3,601 |
Total impaired loans, Unpaid Principal Balance | 4,267 |
Total impaired loans, Average Recorded Investment | 3,079 |
Total impaired loans, Interest Income Recognized | 124 |
Acquisition, Development and Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 6,200 | 2,637
Impaired loans with no related allowance, Unpaid Principal Balance | 15,500 | 3,035
Impaired loans with no related allowance, Average Recorded Investment | 1,550 | 1,086
Impaired loans with no related allowance, Interest Income Recognized | 414 | 148
Total impaired loans, Recorded Investment | 6,200 |
Total impaired loans, Unpaid Principal Balance | 15,500 |
Total impaired loans, Average Recorded Investment | 1,550 |
Total impaired loans, Interest Income Recognized | 414 |
Other loans |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 6,739 | 4,474
Impaired loans with no related allowance, Unpaid Principal Balance | 7,955 | 4,794
Impaired loans with no related allowance, Average Recorded Investment | 8,261 | 8,386
Impaired loans with no related allowance, Interest Income Recognized | 92 | $ 118
Impaired loans with an allowance recorded, Recorded Investment | 11,853 |
Impaired loans with an allowance recorded, Unpaid Principal Balance | 13,529 |
Impaired loans with an allowance recorded, Related Allowance | 577 |
Impaired loans with an allowance recorded, Average Recorded Investment | 4,574 |
Impaired loans with an allowance recorded, Interest Income Recognized | 213 |
Total impaired loans, Recorded Investment | 18,592 |
Total impaired loans, Unpaid Principal Balance | 21,484 |
Total impaired loans, Related Allowance | 577 |
Total impaired loans, Average Recorded Investment | 12,835 |
Total impaired loans, Interest Income Recognized | $ 305 |

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