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Additional Information about Impaired Loans (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 66,195 | $ 80,557
Impaired loans with no related allowance, Unpaid Principal Balance | 136,737 | 154,647
Impaired loans with no related allowance, Average Recorded Investment | 72,024 | 69,615
Impaired loans with no related allowance, Interest Income Recognized | 2,071 | 3,412
Impaired loans with an allowance recorded, Recorded Investment | 39 |
Impaired loans with an allowance recorded, Unpaid Principal Balance | 39 |
Impaired loans with an allowance recorded, Related Allowance | 39 |
Impaired loans with an allowance recorded, Average Recorded Investment | 26 | 314
Impaired loans with an allowance recorded, Interest Income Recognized | 4 |
Total impaired loans, Recorded Investment | 66,234 | 80,557
Total impaired loans, Unpaid Principal Balance | 136,776 | 154,647
Total impaired loans, Related Allowance | 39 |
Total impaired loans, Average Recorded Investment | 72,050 | 69,929
Total impaired loans, Interest Income Recognized | 2,075 | 3,412
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 5,990 | 8,892
Impaired loans with no related allowance, Unpaid Principal Balance | 8,778 | 11,470
Impaired loans with no related allowance, Average Recorded Investment | 7,771 | 9,554
Impaired loans with no related allowance, Interest Income Recognized | 227 | 495
Total impaired loans, Recorded Investment | 5,990 | 8,892
Total impaired loans, Unpaid Principal Balance | 8,778 | 11,470
Total impaired loans, Average Recorded Investment | 7,771 | 9,554
Total impaired loans, Interest Income Recognized | 227 | 495
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 3,675 | 5,137
Impaired loans with no related allowance, Unpaid Principal Balance | 8,790 | 10,252
Impaired loans with no related allowance, Average Recorded Investment | 3,811 | 3,522
Impaired loans with no related allowance, Interest Income Recognized | 29 | 92
Total impaired loans, Recorded Investment | 3,675 | 5,137
Total impaired loans, Unpaid Principal Balance | 8,790 | 10,252
Total impaired loans, Average Recorded Investment | 3,811 | 3,522
Total impaired loans, Interest Income Recognized | 29 | 92
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 1,669 | 1,966
Impaired loans with no related allowance, Unpaid Principal Balance | 1,722 | 2,072
Impaired loans with no related allowance, Average Recorded Investment | 1,861 | 2,489
Impaired loans with no related allowance, Interest Income Recognized | 24 | 50
Total impaired loans, Recorded Investment | 1,669 | 1,966
Total impaired loans, Unpaid Principal Balance | 1,722 | 2,072
Total impaired loans, Average Recorded Investment | 1,861 | 2,489
Total impaired loans, Interest Income Recognized | 24 | 50
Acquisition, Development and Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 9,552 | 15,752
Impaired loans with no related allowance, Unpaid Principal Balance | 10,452 | 25,952
Impaired loans with no related allowance, Average Recorded Investment | 11,619 | 10,976
Impaired loans with no related allowance, Interest Income Recognized | 287 | 575
Total impaired loans, Recorded Investment | 9,552 | 15,752
Total impaired loans, Unpaid Principal Balance | 10,452 | 25,952
Total impaired loans, Average Recorded Investment | 11,619 | 10,976
Total impaired loans, Interest Income Recognized | 287 | 575
Other loans |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 45,309 | 48,810
Impaired loans with no related allowance, Unpaid Principal Balance | 106,995 | 104,901
Impaired loans with no related allowance, Average Recorded Investment | 46,962 | 43,074
Impaired loans with no related allowance, Interest Income Recognized | 1,504 | 2,200
Impaired loans with an allowance recorded, Recorded Investment | 39 |
Impaired loans with an allowance recorded, Unpaid Principal Balance | 39 |
Impaired loans with an allowance recorded, Related Allowance | 39 |
Impaired loans with an allowance recorded, Average Recorded Investment | 26 | 314
Impaired loans with an allowance recorded, Interest Income Recognized | 4 |
Total impaired loans, Recorded Investment | 45,348 | 48,810
Total impaired loans, Unpaid Principal Balance | 107,034 | 104,901
Total impaired loans, Related Allowance | 39 |
Total impaired loans, Average Recorded Investment | 46,988 | 43,388
Total impaired loans, Interest Income Recognized | $ 1,508 | $ 2,200

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