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Credit Quality and Allowance for Loan Losses - Summary of Information Pertaining to Originated Loans Which were Deemed to be Impaired Loans (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | $ 3,448 |  | $ 3,144
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 3,640 |  | 3,178
Impaired loans with no related allowance recorded, Average Recorded Investment | 3,597 |  | 262
Impaired loans with no related allowance recorded, Interest Income Recognized | 152 |  | 166
Impaired loans with an allowance recorded, Recorded Investment | 2,447 | $ 4,248 | 2,414
Impaired loans with an allowance recorded, Unpaid Principal Balance | 2,562 | 4,324 | 2,480
Impaired loans with an allowance recorded, Related Allowance | 1,213 | 639 | 795
Impaired loans with an allowance recorded, Average Recorded Investment | 2,793 | 1,744 | 2,151
Impaired loans with an allowance recorded, Interest Income Recognized | 97 | 170 | 114
Impaired loans Recorded Investment | 5,895 | 4,248 | 5,558
Impaired loans Unpaid Principal Balance | 6,202 | 4,324 | 5,658
Impaired loans Related Allowance | 1,213 | 639 | 795
Impaired loans Average Recorded Investment | 6,390 | 1,744 | 2,413
Impaired loans Interest Income Recognized | 249 | 170 | 280
One- to Four-Family First Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with an allowance recorded, Recorded Investment |  | 75 | 252
Impaired loans with an allowance recorded, Unpaid Principal Balance |  | 81 | 260
Impaired loans with an allowance recorded, Related Allowance |  | 28 | 39
Impaired loans with an allowance recorded, Average Recorded Investment | 55 | 79 | 93
Impaired loans with an allowance recorded, Interest Income Recognized |  | 4 | 13
Impaired loans Recorded Investment |  | 75 | 252
Impaired loans Unpaid Principal Balance |  | 81 | 260
Impaired loans Related Allowance |  | 28 | 39
Impaired loans Average Recorded Investment | 55 | 79 | 93
Impaired loans Interest Income Recognized |  | 4 | 13
Home Equity Loans and Lines [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 473 |  |
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 476 |  |
Impaired loans with no related allowance recorded, Average Recorded Investment | 370 |  |
Impaired loans with no related allowance recorded, Interest Income Recognized | 18 |  |
Impaired loans with an allowance recorded, Recorded Investment | 459 |  |
Impaired loans with an allowance recorded, Unpaid Principal Balance | 460 |  |
Impaired loans with an allowance recorded, Related Allowance | 348 |  |
Impaired loans with an allowance recorded, Average Recorded Investment | 358 |  |
Impaired loans with an allowance recorded, Interest Income Recognized | 17 |  |
Impaired loans Recorded Investment | 932 |  |
Impaired loans Unpaid Principal Balance | 936 |  |
Impaired loans Related Allowance | 348 |  |
Impaired loans Average Recorded Investment | 728 |  |
Impaired loans Interest Income Recognized | 35 |  |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 23 |  |
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 33 |  |
Impaired loans with no related allowance recorded, Average Recorded Investment | 18 |  |
Impaired loans with no related allowance recorded, Interest Income Recognized | 1 |  |
Impaired loans with an allowance recorded, Recorded Investment |  | 619 | 462
Impaired loans with an allowance recorded, Unpaid Principal Balance |  | 650 | 483
Impaired loans with an allowance recorded, Related Allowance |  | 64 | 19
Impaired loans with an allowance recorded, Average Recorded Investment | 395 | 375 | 423
Impaired loans with an allowance recorded, Interest Income Recognized |  | 17 | 14
Impaired loans Recorded Investment | 23 | 619 | 462
Impaired loans Unpaid Principal Balance | 33 | 650 | 483
Impaired loans Related Allowance |  | 64 | 19
Impaired loans Average Recorded Investment | 413 | 375 | 423
Impaired loans Interest Income Recognized | 1 | 17 | 14
Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired loans with no related allowance recorded, Recorded Investment | 2,952 |  | 3,144
Impaired loans with no related allowance recorded, Unpaid Principal Balance | 3,131 |  | 3,178
Impaired loans with no related allowance recorded, Average Recorded Investment | 3,209 |  | 262
Impaired loans with no related allowance recorded, Interest Income Recognized | 133 |  | 166
Impaired loans with an allowance recorded, Recorded Investment | 1,988 | 3,554 | 1,700
Impaired loans with an allowance recorded, Unpaid Principal Balance | 2,102 | 3,593 | 1,737
Impaired loans with an allowance recorded, Related Allowance | 865 | 547 | 737
Impaired loans with an allowance recorded, Average Recorded Investment | 1,985 | 1,290 | 1,635
Impaired loans with an allowance recorded, Interest Income Recognized | 80 | 149 | 87
Impaired loans Recorded Investment | 4,940 | 3,554 | 4,844
Impaired loans Unpaid Principal Balance | 5,233 | 3,593 | 4,915
Impaired loans Related Allowance | 865 | 547 | 737
Impaired loans Average Recorded Investment | 5,194 | 1,290 | 1,897
Impaired loans Interest Income Recognized | $ 213 | $ 149 | $ 253

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