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Additional Information about Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with an allowance recorded, Recorded Investment |  | $ 3,139
Impaired loans with no related allowance, Recorded Investment | $ 51,954 | 85,241
Impaired loans with an allowance recorded, Unpaid Principal Balance |  | 3,139
Impaired loans with no related allowance, Unpaid Principal Balance | 61,617 | 100,301
Impaired loans with an allowance recorded, Related Allowance |  | 26
Impaired loans with no related allowance, Average Recorded Investment | 67,805 | 93,494
Impaired loans with an allowance recorded, Average Recorded Investment |  | 1,179
Impaired loans with no related allowance, Interest Income Recognized | 2,044 | 3,790
Impaired loans with an allowance recorded, Interest Income Recognized |  | 72
Total impaired loans, Recorded Investment | 51,954 | 88,380
Total impaired loans, Unpaid Principal Balance | 61,617 | 103,440
Total impaired loans, Average Recorded Investment | 67,805 | 94,673
Total impaired loans, Interest Income Recognized | 2,044 | 3,862
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with an allowance recorded, Recorded Investment |  | 3,139
Impaired loans with no related allowance, Recorded Investment | 27,464 | 45,383
Impaired loans with an allowance recorded, Unpaid Principal Balance |  | 3,139
Impaired loans with no related allowance, Unpaid Principal Balance | 29,379 | 52,593
Impaired loans with an allowance recorded, Related Allowance |  | 26
Impaired loans with no related allowance, Average Recorded Investment | 30,965 | 54,051
Impaired loans with an allowance recorded, Average Recorded Investment |  | 628
Impaired loans with no related allowance, Interest Income Recognized | 1,320 | 1,636
Impaired loans with an allowance recorded, Interest Income Recognized |  | 72
Total impaired loans, Recorded Investment | 27,464 | 48,522
Total impaired loans, Unpaid Principal Balance | 29,379 | 55,732
Total impaired loans, Average Recorded Investment | 30,965 | 54,679
Total impaired loans, Interest Income Recognized | 1,320 | 1,708
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 13,995 | 30,370
Impaired loans with no related allowance, Unpaid Principal Balance | 15,480 | 32,460
Impaired loans with no related allowance, Average Recorded Investment | 25,066 | 29,935
Impaired loans with an allowance recorded, Average Recorded Investment |  | 490
Impaired loans with no related allowance, Interest Income Recognized | 383 | 1,629
Total impaired loans, Recorded Investment | 13,995 | 30,370
Total impaired loans, Unpaid Principal Balance | 15,480 | 32,460
Total impaired loans, Average Recorded Investment | 25,066 | 30,425
Total impaired loans, Interest Income Recognized | 383 | 1,629
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 3,384 | 2,028
Impaired loans with no related allowance, Unpaid Principal Balance | 8,929 | 2,069
Impaired loans with no related allowance, Average Recorded Investment | 2,302 | 1,254
Impaired loans with an allowance recorded, Average Recorded Investment |  | 61
Impaired loans with no related allowance, Interest Income Recognized | 75 |
Total impaired loans, Recorded Investment | 3,384 | 2,028
Total impaired loans, Unpaid Principal Balance | 8,929 | 2,069
Total impaired loans, Average Recorded Investment | 2,302 | 1,315
Total impaired loans, Interest Income Recognized | 75 |
Acquisition, Development and Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 2,637 | 654
Impaired loans with no related allowance, Unpaid Principal Balance | 3,035 | 1,024
Impaired loans with no related allowance, Average Recorded Investment | 1,086 | 505
Impaired loans with no related allowance, Interest Income Recognized | 148 | 218
Total impaired loans, Recorded Investment | 2,637 | 654
Total impaired loans, Unpaid Principal Balance | 3,035 | 1,024
Total impaired loans, Average Recorded Investment | 1,086 | 505
Total impaired loans, Interest Income Recognized | 148 | 218
Other loans |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 4,474 |
Impaired loans with no related allowance, Unpaid Principal Balance | 4,794 |
Impaired loans with no related allowance, Average Recorded Investment | 8,386 |
Impaired loans with no related allowance, Interest Income Recognized | 118 |
Total impaired loans, Recorded Investment | 4,474 |
Total impaired loans, Unpaid Principal Balance | 4,794 |
Total impaired loans, Average Recorded Investment | 8,386 |
Total impaired loans, Interest Income Recognized | $ 118 |
Commercial and Industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment |  | 6,806
Impaired loans with no related allowance, Unpaid Principal Balance |  | 12,155
Impaired loans with no related allowance, Average Recorded Investment |  | 7,749
Impaired loans with no related allowance, Interest Income Recognized |  | 307
Total impaired loans, Recorded Investment |  | 6,806
Total impaired loans, Unpaid Principal Balance |  | 12,155
Total impaired loans, Average Recorded Investment |  | 7,749
Total impaired loans, Interest Income Recognized |  | $ 307

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