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Additional Information about Impaired Loans (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 44,907,000 | $ 56,936,000
Impaired loans with no related allowance, Unpaid Principal Balance |  | 143,149,000
Impaired loans with no related allowance, Average Recorded Investment |  | 54,393,000
Impaired loans with no related allowance, Interest Income Recognized | 644,000 | 3,516,000
Impaired loans with an allowance recorded, Recorded Investment | 4,375,000 | 1,445,000
Impaired loans with an allowance recorded, Unpaid Principal Balance |  | 4,173,000
Impaired loans with an allowance recorded, Related Allowance | 384,000 | 116,000
Impaired loans with an allowance recorded, Average Recorded Investment |  | 4,111,000
Impaired loans with an allowance recorded, Interest Income Recognized | 18,000 | 13,000
Total impaired loans, Recorded Investment | 49,282,000 | 58,381,000
Total impaired loans, Unpaid Principal Balance |  | 147,322
Total impaired loans, Related Allowance | 384,000 | 116,000
Total impaired loans, Average Recorded Investment |  | 58,504,000
Total impaired loans, Interest Income Recognized | 662,000 | 3,529,000
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 2,412,000 | 3,577,000
Impaired loans with no related allowance, Unpaid Principal Balance |  | 6,790,000
Impaired loans with no related allowance, Average Recorded Investment |  | 4,336,000
Impaired loans with no related allowance, Interest Income Recognized | 64,000 | 266,000
Impaired loans with an allowance recorded, Recorded Investment | 1,830,000 |
Impaired loans with an allowance recorded, Related Allowance | 264,000 |
Total impaired loans, Recorded Investment | 4,242,000 | 3,577,000
Total impaired loans, Unpaid Principal Balance |  | 6,790
Total impaired loans, Related Allowance | 264,000 |
Total impaired loans, Average Recorded Investment |  | 4,336,000
Total impaired loans, Interest Income Recognized | 64,000 | 266,000
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 14,700,000 | 14,717,000
Impaired loans with no related allowance, Unpaid Principal Balance |  | 19,832,000
Impaired loans with no related allowance, Average Recorded Investment |  | 6,140,000
Impaired loans with no related allowance, Interest Income Recognized | 24,000 | 371,000
Impaired loans with an allowance recorded, Recorded Investment | 1,401,000 |
Impaired loans with an allowance recorded, Related Allowance | 110,000 |
Impaired loans with an allowance recorded, Interest Income Recognized | 15,000 |
Total impaired loans, Recorded Investment | 16,101,000 | 14,717,000
Total impaired loans, Unpaid Principal Balance |  | 19,832
Total impaired loans, Related Allowance | 110,000 |
Total impaired loans, Average Recorded Investment |  | 6,140,000
Total impaired loans, Interest Income Recognized | 39,000 | 371,000
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 577,000 | 584,000
Impaired loans with no related allowance, Unpaid Principal Balance |  | 602,000
Impaired loans with no related allowance, Average Recorded Investment |  | 811,000
Impaired loans with no related allowance, Interest Income Recognized | 5,000 | 21,000
Impaired loans with an allowance recorded, Recorded Investment | 1,144,000 |
Impaired loans with an allowance recorded, Related Allowance | 10,000 |
Impaired loans with an allowance recorded, Interest Income Recognized | 3,000 |
Total impaired loans, Recorded Investment | 1,721,000 | 584,000
Total impaired loans, Unpaid Principal Balance |  | 602,000
Total impaired loans, Related Allowance | 10,000 |
Total impaired loans, Average Recorded Investment |  | 811,000
Total impaired loans, Interest Income Recognized | 8,000 | 21,000
Acquisition, development, and construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment |  | 389,000
Impaired loans with no related allowance, Unpaid Principal Balance |  | 1,289,000
Impaired loans with no related allowance, Average Recorded Investment |  | 3,508,000
Impaired loans with no related allowance, Interest Income Recognized |  | 364,000
Total impaired loans, Recorded Investment |  | 389,000
Total impaired loans, Unpaid Principal Balance |  | 1,289
Total impaired loans, Average Recorded Investment |  | 3,508,000
Total impaired loans, Interest Income Recognized |  | 364,000
Other |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 27,218,000 | 37,669,000
Impaired loans with no related allowance, Unpaid Principal Balance |  | 114,636,000
Impaired loans with no related allowance, Average Recorded Investment |  | 39,598,000
Impaired loans with no related allowance, Interest Income Recognized | 551,000 | 2,494,000
Impaired loans with an allowance recorded, Recorded Investment |  | 1,445,000
Impaired loans with an allowance recorded, Unpaid Principal Balance |  | 4,173,000
Impaired loans with an allowance recorded, Related Allowance |  | 116,000
Impaired loans with an allowance recorded, Average Recorded Investment |  | 4,111,000
Impaired loans with an allowance recorded, Interest Income Recognized |  | 13,000
Total impaired loans, Recorded Investment | 27,218,000 | 39,114,000
Total impaired loans, Unpaid Principal Balance |  | 118,809
Total impaired loans, Related Allowance |  | 116,000
Total impaired loans, Average Recorded Investment |  | 43,709,000
Total impaired loans, Interest Income Recognized | $ 551,000 | $ 2,507,000

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