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Additional Information about Impaired Loans (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 71,210 | $ 36,399
Impaired loans with no related allowance, Unpaid Principal Balance | 109,411 | 55,723
Impaired loans with no related allowance, Average Recorded Investment | 53,063 | 34,782
Impaired loans with no related allowance, Interest Income Recognized | 807 | 1,400
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 | 4,370 | 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
Impaired loans with an allowance recorded, 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 | 10,029 | 10,742
Impaired loans with no related allowance, Unpaid Principal Balance | 12,640 | 13,133
Impaired loans with no related allowance, Average Recorded Investment | 10,331 | 11,431
Impaired loans with no related allowance, Interest Income Recognized | 285 | 627
Total impaired loans, Recorded Investment | 10,029 | 10,742
Total impaired loans, Unpaid Principal Balance | 12,640 | 13,133
Total impaired loans, Average Recorded Investment | 10,331 | 11,431
Total impaired loans, Interest Income Recognized | 285 | 627
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 3,148 | 9,117
Impaired loans with no related allowance, Unpaid Principal Balance | 8,933 | 14,868
Impaired loans with no related allowance, Average Recorded Investment | 5,147 | 10,461
Impaired loans with no related allowance, Interest Income Recognized | 44 | 143
Total impaired loans, Recorded Investment | 3,148 | 9,117
Total impaired loans, Unpaid Principal Balance | 8,933 | 14,868
Total impaired loans, Average Recorded Investment | 5,147 | 10,461
Total impaired loans, Interest Income Recognized | 44 | 143
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 2,173 | 3,601
Impaired loans with no related allowance, Unpaid Principal Balance | 2,442 | 4,267
Impaired loans with no related allowance, Average Recorded Investment | 3,204 | 3,079
Impaired loans with no related allowance, Interest Income Recognized | 26 | 124
Total impaired loans, Recorded Investment | 2,173 | 3,601
Total impaired loans, Unpaid Principal Balance | 2,442 | 4,267
Total impaired loans, Average Recorded Investment | 3,204 | 3,079
Total impaired loans, Interest Income Recognized | 26 | 124
Acquisition, Development and Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 6,200 | 6,200
Impaired loans with no related allowance, Unpaid Principal Balance | 15,500 | 15,500
Impaired loans with no related allowance, Average Recorded Investment | 6,200 | 1,550
Impaired loans with no related allowance, Interest Income Recognized |  | 414
Total impaired loans, Recorded Investment | 6,200 | 6,200
Total impaired loans, Unpaid Principal Balance | 15,500 | 15,500
Total impaired loans, Average Recorded Investment | 6,200 | 1,550
Total impaired loans, Interest Income Recognized |  | 414
Other loans |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 49,660 | 6,739
Impaired loans with no related allowance, Unpaid Principal Balance | 69,896 | 7,955
Impaired loans with no related allowance, Average Recorded Investment | 28,181 | 8,261
Impaired loans with no related allowance, Interest Income Recognized | 452 | 92
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 | 4,370 | 4,574
Impaired loans with an allowance recorded, Interest Income Recognized |  | 213
Total impaired loans, Recorded Investment | 49,660 | 18,592
Total impaired loans, Unpaid Principal Balance | 69,896 | 21,484
Impaired loans with an allowance recorded, Related Allowance |  | 577
Total impaired loans, Average Recorded Investment | 32,551 | 12,835
Total impaired loans, Interest Income Recognized | $ 452 | $ 305

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