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Additional Information about Impaired Loans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 51,579 | $ 36,399
Impaired loans with no related allowance, Unpaid Principal Balance | 78,580 | 55,723
Impaired loans with no related allowance, Average Recorded Investment | 43,989 | 34,782
Impaired loans with no related allowance, Interest Income Recognized | 370 | 1,400
Impaired loans with an allowance recorded, Recorded Investment | 1,257 | 11,853
Impaired loans with an allowance recorded, Unpaid Principal Balance | 1,257 | 13,529
Impaired loans with an allowance recorded, Related Allowance | 189 | 577
Impaired loans with an allowance recorded, Average Recorded Investment | 6,555 | 4,574
Impaired loans with an allowance recorded, Interest Income Recognized | 10 | 213
Total impaired loans, Recorded Investment | 52,836 | 48,252
Total impaired loans, Unpaid Principal Balance | 79,837 | 69,252
Total impaired loans, Related Allowance | 189 | 577
Total impaired loans, Average Recorded Investment | 50,544 | 39,356
Total impaired loans, Interest Income Recognized | 380 | 1,613
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 10,223 | 10,742
Impaired loans with no related allowance, Unpaid Principal Balance | 12,724 | 13,133
Impaired loans with no related allowance, Average Recorded Investment | 10,482 | 11,431
Impaired loans with no related allowance, Interest Income Recognized | 143 | 627
Total impaired loans, Recorded Investment | 10,223 | 10,742
Total impaired loans, Unpaid Principal Balance | 12,724 | 13,133
Total impaired loans, Average Recorded Investment | 10,482 | 11,431
Total impaired loans, Interest Income Recognized | 143 | 627
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 3,176 | 9,117
Impaired loans with no related allowance, Unpaid Principal Balance | 8,946 | 14,868
Impaired loans with no related allowance, Average Recorded Investment | 6,147 | 10,461
Impaired loans with no related allowance, Interest Income Recognized | 23 | 143
Total impaired loans, Recorded Investment | 3,176 | 9,117
Total impaired loans, Unpaid Principal Balance | 8,946 | 14,868
Total impaired loans, Average Recorded Investment | 6,147 | 10,461
Total impaired loans, Interest Income Recognized | 23 | 143
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 3,837 | 3,601
Impaired loans with no related allowance, Unpaid Principal Balance | 4,504 | 4,267
Impaired loans with no related allowance, Average Recorded Investment | 3,719 | 3,079
Impaired loans with no related allowance, Interest Income Recognized | 28 | 124
Total impaired loans, Recorded Investment | 3,837 | 3,601
Total impaired loans, Unpaid Principal Balance | 4,504 | 4,267
Total impaired loans, Average Recorded Investment | 3,719 | 3,079
Total impaired loans, Interest Income Recognized | 28 | 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 | 28,143 | 6,739
Impaired loans with no related allowance, Unpaid Principal Balance | 36,906 | 7,955
Impaired loans with no related allowance, Average Recorded Investment | 17,441 | 8,261
Impaired loans with no related allowance, Interest Income Recognized | 176 | 92
Impaired loans with an allowance recorded, Recorded Investment | 1,257 | 11,853
Impaired loans with an allowance recorded, Unpaid Principal Balance | 1,257 | 13,529
Impaired loans with an allowance recorded, Related Allowance | 189 | 577
Impaired loans with an allowance recorded, Average Recorded Investment | 6,555 | 4,574
Impaired loans with an allowance recorded, Interest Income Recognized | 10 | 213
Total impaired loans, Recorded Investment | 29,400 | 18,592
Total impaired loans, Unpaid Principal Balance | 38,163 | 21,484
Total impaired loans, Related Allowance | 189 | 577
Total impaired loans, Average Recorded Investment | 23,996 | 12,835
Total impaired loans, Interest Income Recognized | $ 186 | $ 305

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