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Additional Information about Impaired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 52,169 | $ 80,557
Impaired loans with no related allowance, Unpaid Principal Balance | 126,513 | 154,647
Impaired loans with no related allowance, Average Recorded Investment | 63,146 | 69,615
Impaired loans with no related allowance, Interest Income Recognized | 4,013 | 3,412
Impaired loans with an allowance recorded, Average Recorded Investment | 20 | 314
Total impaired loans, Recorded Investment | 52,169 | 80,557
Total impaired loans, Unpaid Principal Balance | 126,513 | 154,647
Total impaired loans, Average Recorded Investment | 63,166 | 69,929
Total impaired loans, Interest Income Recognized | 4,013 | 3,412
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 4,220 | 8,892
Impaired loans with no related allowance, Unpaid Principal Balance | 7,168 | 11,470
Impaired loans with no related allowance, Average Recorded Investment | 6,114 | 9,554
Impaired loans with no related allowance, Interest Income Recognized | 340 | 495
Total impaired loans, Recorded Investment | 4,220 | 8,892
Total impaired loans, Unpaid Principal Balance | 7,168 | 11,470
Total impaired loans, Average Recorded Investment | 6,114 | 9,554
Total impaired loans, Interest Income Recognized | 340 | 495
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 2,256 | 5,137
Impaired loans with no related allowance, Unpaid Principal Balance | 7,371 | 10,252
Impaired loans with no related allowance, Average Recorded Investment | 3,234 | 3,522
Impaired loans with no related allowance, Interest Income Recognized |  | 92
Total impaired loans, Recorded Investment | 2,256 | 5,137
Total impaired loans, Unpaid Principal Balance | 7,371 | 10,252
Total impaired loans, Average Recorded Investment | 3,234 | 3,522
Total impaired loans, Interest Income Recognized |  | 92
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 1,022 | 1,966
Impaired loans with no related allowance, Unpaid Principal Balance | 1,076 | 2,072
Impaired loans with no related allowance, Average Recorded Investment | 1,576 | 2,489
Impaired loans with no related allowance, Interest Income Recognized | 26 | 50
Total impaired loans, Recorded Investment | 1,022 | 1,966
Total impaired loans, Unpaid Principal Balance | 1,076 | 2,072
Total impaired loans, Average Recorded Investment | 1,576 | 2,489
Total impaired loans, Interest Income Recognized | 26 | 50
Acquisition, development, and construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 8,296 | 15,752
Impaired loans with no related allowance, Unpaid Principal Balance | 9,197 | 25,952
Impaired loans with no related allowance, Average Recorded Investment | 9,238 | 10,976
Impaired loans with no related allowance, Interest Income Recognized | 590 | 575
Total impaired loans, Recorded Investment | 8,296 | 15,752
Total impaired loans, Unpaid Principal Balance | 9,197 | 25,952
Total impaired loans, Average Recorded Investment | 9,238 | 10,976
Total impaired loans, Interest Income Recognized | 590 | 575
Other loans |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 36,375 | 48,810
Impaired loans with no related allowance, Unpaid Principal Balance | 101,701 | 104,901
Impaired loans with no related allowance, Average Recorded Investment | 42,984 | 43,074
Impaired loans with no related allowance, Interest Income Recognized | 3,057 | 2,200
Impaired loans with an allowance recorded, Average Recorded Investment | 20 | 314
Total impaired loans, Recorded Investment | 36,375 | 48,810
Total impaired loans, Unpaid Principal Balance | 101,701 | 104,901
Total impaired loans, Average Recorded Investment | 43,004 | 43,388
Total impaired loans, Interest Income Recognized | $ 3,057 | $ 2,200

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