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Loans - Summary of Information Pertaining to Impaired Loans Excluding Acquired Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | $ 901 | $ 2,130 | $ 920
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 987 | 2,541 | 942
Impaired loans with no related allowance recorded, Average Recorded Investment | 1,631 | 924 | 3,263
Impaired loans with no related allowance recorded, Interest Income Recognized | 0 | 7 | 3
Impaired loans with an allowance recorded, Recorded Investment | 7,811 | 7,747 | 2,539
Impaired loans with an allowance recorded, Unpaid Principal Balance | 8,226 | 7,809 | 2,618
Impaired loans with an allowance recorded, Related Allowance | 1,347 | 1,154 | 1,973
Impaired loans with an allowance recorded, Average Recorded Investment | 7,605 | 3,864 | 2,706
Impaired loans with an allowance recorded, Interest Income Recognized | 15 | 39 | 53
Impaired loans Recorded Investment | 8,712 | 9,877 | 3,459
Impaired loans Unpaid Principal Balance | 9,213 | 10,350 | 3,560
Impaired loans Related Allowance | 1,347 | 1,154 | 1,973
Impaired loans Average Recorded Investment | 9,236 | 4,788 | 5,969
Impaired loans Interest Income Recognized | 15 | 46 | 56
One- to four-family first mortgage |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 187 | 0 | 0
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 187 | 0 | 0
Impaired loans with no related allowance recorded, Average Recorded Investment | 109 | 0 | 0
Impaired loans with no related allowance recorded, Interest Income Recognized | 0 | 0 | 0
Impaired loans with an allowance recorded, Recorded Investment | 0 | 0 | 0
Impaired loans with an allowance recorded, Unpaid Principal Balance | 0 | 0 | 0
Impaired loans with an allowance recorded, Related Allowance | 0 | 0 | 0
Impaired loans with an allowance recorded, Average Recorded Investment | 0 | 0 | 42
Impaired loans with an allowance recorded, Interest Income Recognized | 0 | 0 | 0
Impaired loans Recorded Investment | 187 | 0 | 0
Impaired loans Unpaid Principal Balance | 187 | 0 | 0
Impaired loans Related Allowance | 0 | 0 | 0
Impaired loans Average Recorded Investment | 109 | 0 | 42
Impaired loans Interest Income Recognized | 0 | 0 | 0
Home equity loans and lines |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 404 | 441 | 470
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 450 | 476 | 476
Impaired loans with no related allowance recorded, Average Recorded Investment | 418 | 454 | 395
Impaired loans with no related allowance recorded, Interest Income Recognized | 0 | 0 | 1
Impaired loans with an allowance recorded, Recorded Investment | 380 | 425 | 455
Impaired loans with an allowance recorded, Unpaid Principal Balance | 425 | 457 | 461
Impaired loans with an allowance recorded, Related Allowance | 348 | 349 | 348
Impaired loans with an allowance recorded, Average Recorded Investment | 400 | 440 | 383
Impaired loans with an allowance recorded, Interest Income Recognized | 0 | 0 | 1
Impaired loans Recorded Investment | 784 | 866 | 925
Impaired loans Unpaid Principal Balance | 875 | 933 | 937
Impaired loans Related Allowance | 348 | 349 | 348
Impaired loans Average Recorded Investment | 818 | 894 | 778
Impaired loans Interest Income Recognized | 0 | 0 | 2
Commercial real estate |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 19 | 149 | 22
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 21 | 161 | 32
Impaired loans with no related allowance recorded, Average Recorded Investment | 41 | 32 | 19
Impaired loans with no related allowance recorded, Interest Income Recognized | 0 | 7 | 0
Impaired loans with an allowance recorded, Recorded Investment | 6,499 | 6,910 | 0
Impaired loans with an allowance recorded, Unpaid Principal Balance | 6,587 | 6,910 | 0
Impaired loans with an allowance recorded, Related Allowance | 298 | 484 | 0
Impaired loans with an allowance recorded, Average Recorded Investment | 6,639 | 2,057 | 296
Impaired loans with an allowance recorded, Interest Income Recognized | 15 | 38 | 0
Impaired loans Recorded Investment | 6,518 | 7,059 | 22
Impaired loans Unpaid Principal Balance | 6,608 | 7,071 | 32
Impaired loans Related Allowance | 298 | 484 | 0
Impaired loans Average Recorded Investment | 6,680 | 2,089 | 315
Impaired loans Interest Income Recognized | 15 | 45 | 0
Construction and land |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 0 | 0 | 0
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 0 | 0 | 0
Impaired loans with no related allowance recorded, Average Recorded Investment | 0 | 0 | 0
Impaired loans with no related allowance recorded, Interest Income Recognized | 0 | 0 | 0
Impaired loans with an allowance recorded, Recorded Investment | 0 | 0 | 0
Impaired loans with an allowance recorded, Unpaid Principal Balance | 0 | 0 | 0
Impaired loans with an allowance recorded, Related Allowance | 0 | 0 | 0
Impaired loans with an allowance recorded, Average Recorded Investment | 0 | 0 | 0
Impaired loans with an allowance recorded, Interest Income Recognized | 0 | 0 | 0
Impaired loans Recorded Investment | 0 | 0 | 0
Impaired loans Unpaid Principal Balance | 0 | 0 | 0
Impaired loans Related Allowance | 0 | 0 | 0
Impaired loans Average Recorded Investment | 0 | 0 | 0
Impaired loans Interest Income Recognized | 0 | 0 | 0
Multi-family residential |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 0 | 0 | 0
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 0 | 0 | 0
Impaired loans with no related allowance recorded, Average Recorded Investment | 0 | 0 | 0
Impaired loans with no related allowance recorded, Interest Income Recognized | 0 | 0 | 0
Impaired loans with an allowance recorded, Recorded Investment | 0 | 0 | 0
Impaired loans with an allowance recorded, Unpaid Principal Balance | 0 | 0 | 0
Impaired loans with an allowance recorded, Related Allowance | 0 | 0 | 0
Impaired loans with an allowance recorded, Average Recorded Investment | 0 | 0 | 0
Impaired loans with an allowance recorded, Interest Income Recognized | 0 | 0 | 0
Impaired loans Recorded Investment | 0 | 0 | 0
Impaired loans Unpaid Principal Balance | 0 | 0 | 0
Impaired loans Related Allowance | 0 | 0 | 0
Impaired loans Average Recorded Investment | 0 | 0 | 0
Impaired loans Interest Income Recognized | 0 | 0 | 0
Commercial and industrial |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 291 | 1,540 | 428
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 329 | 1,904 | 434
Impaired loans with no related allowance recorded, Average Recorded Investment | 1,063 | 438 | 2,849
Impaired loans with no related allowance recorded, Interest Income Recognized | 0 | 0 | 2
Impaired loans with an allowance recorded, Recorded Investment | 932 | 412 | 2,084
Impaired loans with an allowance recorded, Unpaid Principal Balance | 1,214 | 442 | 2,157
Impaired loans with an allowance recorded, Related Allowance | 701 | 321 | 1,625
Impaired loans with an allowance recorded, Average Recorded Investment | 566 | 1,367 | 1,985
Impaired loans with an allowance recorded, Interest Income Recognized | 0 | 1 | 52
Impaired loans Recorded Investment | 1,223 | 1,952 | 2,512
Impaired loans Unpaid Principal Balance | 1,543 | 2,346 | 2,591
Impaired loans Related Allowance | 701 | 321 | 1,625
Impaired loans Average Recorded Investment | 1,629 | 1,805 | 4,834
Impaired loans Interest Income Recognized | 0 | 1 | 54
Consumer |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 0 | 0 | 0
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 0 | 0 | 0
Impaired loans with no related allowance recorded, Average Recorded Investment | 0 | 0 | 0
Impaired loans with no related allowance recorded, Interest Income Recognized | 0 | 0 | 0
Impaired loans with an allowance recorded, Recorded Investment | 0 | 0 | 0
Impaired loans with an allowance recorded, Unpaid Principal Balance | 0 | 0 | 0
Impaired loans with an allowance recorded, Related Allowance | 0 | 0 | 0
Impaired loans with an allowance recorded, Average Recorded Investment | 0 | 0 | 0
Impaired loans with an allowance recorded, Interest Income Recognized | 0 | 0 | 0
Impaired loans Recorded Investment | 0 | 0 | 0
Impaired loans Unpaid Principal Balance | 0 | 0 | 0
Impaired loans Related Allowance | 0 | 0 | 0
Impaired loans Average Recorded Investment | 0 | 0 | 0
Impaired loans Interest Income Recognized | $ 0 | $ 0 | $ 0

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