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Additional Information about Impaired Loans (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | $ 57,105 | $ 52,169
Impaired loans with no related allowance, Unpaid Principal Balance | 144,392 | 126,513
Impaired loans with no related allowance, Average Recorded Investment | 53,546 | 63,146
Impaired loans with no related allowance, Interest Income Recognized | 3,109 | 4,013
Impaired loans with an allowance recorded, Average Recorded Investment | 5,000 | 20
Total impaired loans, Recorded Investment | 57,105 | 52,169
Total impaired loans, Unpaid Principal Balance | 144,392 | 126,513
Total impaired loans, Average Recorded Investment | 58,546 | 63,166
Total impaired loans, Interest Income Recognized | 3,109 | 4,013
Multi-Family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 5,793 | 4,220
Impaired loans with no related allowance, Unpaid Principal Balance | 9,375 | 7,168
Impaired loans with no related allowance, Average Recorded Investment | 4,590 | 6,114
Impaired loans with no related allowance, Interest Income Recognized | 317 | 340
Total impaired loans, Recorded Investment | 5,793 | 4,220
Total impaired loans, Unpaid Principal Balance | 9,375 | 7,168
Total impaired loans, Average Recorded Investment | 4,590 | 6,114
Total impaired loans, Interest Income Recognized | 317 | 340
Commercial Real Estate |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 5,330 | 2,256
Impaired loans with no related allowance, Unpaid Principal Balance | 10,445 | 7,371
Impaired loans with no related allowance, Average Recorded Investment | 3,280 | 3,234
Impaired loans with no related allowance, Interest Income Recognized | 83 |
Total impaired loans, Recorded Investment | 5,330 | 2,256
Total impaired loans, Unpaid Principal Balance | 10,445 | 7,371
Total impaired loans, Average Recorded Investment | 3,280 | 3,234
Total impaired loans, Interest Income Recognized | 83 |
One-to-four family |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 891 | 1,022
Impaired loans with no related allowance, Unpaid Principal Balance | 909 | 1,076
Impaired loans with no related allowance, Average Recorded Investment | 887 | 1,576
Impaired loans with no related allowance, Interest Income Recognized | 20 | 26
Total impaired loans, Recorded Investment | 891 | 1,022
Total impaired loans, Unpaid Principal Balance | 909 | 1,076
Total impaired loans, Average Recorded Investment | 887 | 1,576
Total impaired loans, Interest Income Recognized | 20 | 26
Acquisition, development, and construction |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 2,349 | 8,296
Impaired loans with no related allowance, Unpaid Principal Balance | 3,249 | 9,197
Impaired loans with no related allowance, Average Recorded Investment | 4,548 | 9,238
Impaired loans with no related allowance, Interest Income Recognized | 324 | 590
Total impaired loans, Recorded Investment | 2,349 | 8,296
Total impaired loans, Unpaid Principal Balance | 3,249 | 9,197
Total impaired loans, Average Recorded Investment | 4,548 | 9,238
Total impaired loans, Interest Income Recognized | 324 | 590
Other |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with no related allowance, Recorded Investment | 42,742 | 36,375
Impaired loans with no related allowance, Unpaid Principal Balance | 120,414 | 101,701
Impaired loans with no related allowance, Average Recorded Investment | 40,241 | 42,984
Impaired loans with no related allowance, Interest Income Recognized | 2,365 | 3,057
Impaired loans with an allowance recorded, Average Recorded Investment | 5,000 | 20
Total impaired loans, Recorded Investment | 42,742 | 36,375
Total impaired loans, Unpaid Principal Balance | 120,414 | 101,701
Total impaired loans, Average Recorded Investment | 45,241 | 43,004
Total impaired loans, Interest Income Recognized | $ 2,365 | $ 3,057

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