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Additional Information about Impaired Loans (Detail) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 30,770,000 | $ 51,954,000
Impaired loans with no related allowance, Unpaid Principal Balance | 39,736,000 | 61,617,000
Impaired loans with no related allowance, Average Recorded Investment | 38,671,000 | 67,805,000
Impaired loans with no related allowance, Interest Income Recognized | 802,000 | 2,044,000
Impaired loans with an allowance recorded, Recorded Investment | 6,442,000 | 0
Impaired loans with an allowance recorded, Unpaid Principal Balance | 6,772,000 |
Impaired loans with an allowance recorded, Related Allowance | 143,000 |
Impaired loans with an allowance recorded, Average Recorded Investment | 1,610,000 |
Impaired loans with an allowance recorded, Interest Income Recognized | 100,000 |
Total impaired loans, Recorded Investment | 37,212,000 |
Total impaired loans, Unpaid Principal Balance | 46,508,000 |
Total impaired loans, Related Allowance | 143,000 |
Total impaired loans, Average Recorded Investment | 40,281,000 |
Total impaired loans, Interest Income Recognized | 902,000 |
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 10,874,000 | 27,464,000
Impaired loans with no related allowance, Unpaid Principal Balance | 13,153,000 | 29,379,000
Impaired loans with no related allowance, Average Recorded Investment | 15,611,000 | 30,965,000
Impaired loans with no related allowance, Interest Income Recognized | 474,000 | 1,320,000
Total impaired loans, Recorded Investment | 10,874,000 |
Total impaired loans, Unpaid Principal Balance | 13,153,000 |
Total impaired loans, Average Recorded Investment | 15,611,000 |
Total impaired loans, Interest Income Recognized | 474,000 |
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 10,381,000 | 13,995,000
Impaired loans with no related allowance, Unpaid Principal Balance | 16,114,000 | 15,480,000
Impaired loans with no related allowance, Average Recorded Investment | 11,681,000 | 25,066,000
Impaired loans with no related allowance, Interest Income Recognized | 162,000 | 383,000
Total impaired loans, Recorded Investment | 10,381,000 |
Total impaired loans, Unpaid Principal Balance | 16,114,000 |
Total impaired loans, Average Recorded Investment | 11,681,000 |
Total impaired loans, Interest Income Recognized | 162,000 |
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 2,908,000 | 3,384,000
Impaired loans with no related allowance, Unpaid Principal Balance | 3,574,000 | 8,929,000
Impaired loans with no related allowance, Average Recorded Investment | 3,025,000 | 2,302,000
Impaired loans with no related allowance, Interest Income Recognized | 76,000 | 75,000
Total impaired loans, Recorded Investment | 2,908,000 |
Total impaired loans, Unpaid Principal Balance | 3,574,000 |
Total impaired loans, Average Recorded Investment | 3,025,000 |
Total impaired loans, Interest Income Recognized | 76,000 |
Acquisition, Development and Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment |  | 2,637,000
Impaired loans with no related allowance, Unpaid Principal Balance |  | 3,035,000
Impaired loans with no related allowance, Average Recorded Investment | 659,000 | 1,086,000
Impaired loans with no related allowance, Interest Income Recognized |  | 148,000
Total impaired loans, Average Recorded Investment | 659,000 |
Other loans |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 6,607,000 | 4,474,000
Impaired loans with no related allowance, Unpaid Principal Balance | 6,895,000 | 4,794,000
Impaired loans with no related allowance, Average Recorded Investment | 7,695,000 | 8,386,000
Impaired loans with no related allowance, Interest Income Recognized | 90,000 | $ 118,000
Impaired loans with an allowance recorded, Recorded Investment | 6,442,000 |
Impaired loans with an allowance recorded, Unpaid Principal Balance | 6,772,000 |
Impaired loans with an allowance recorded, Related Allowance | 143,000 |
Impaired loans with an allowance recorded, Average Recorded Investment | 1,610,000 |
Impaired loans with an allowance recorded, Interest Income Recognized | 100,000 |
Total impaired loans, Recorded Investment | 13,049,000 |
Total impaired loans, Unpaid Principal Balance | 13,667,000 |
Total impaired loans, Related Allowance | 143,000 |
Total impaired loans, Average Recorded Investment | 9,305,000 |
Total impaired loans, Interest Income Recognized | $ 190,000 |

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