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Credit Quality and Allowance for Loan Losses - Information about Company's TDRs (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 3,713 | $ 3,704
Past Due Greater Than 30 Days and Accruing | 214 | 946
Nonaccrual TDRs | 9,394 | 10,410
Total TDRs | 13,321 | 15,060
Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,146 | 1,851
Past Due Greater Than 30 Days and Accruing | 214 | 946
Nonaccrual TDRs | 3,042 | 3,154
Total TDRs | 5,402 | 5,951
Real Estate Loans [Member] | One- to Four-Family First Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 518 | 568
Past Due Greater Than 30 Days and Accruing | 71 | 86
Nonaccrual TDRs | 607 | 387
Total TDRs | 1,196 | 1,041
Real Estate Loans [Member] | Home Equity Loans and Lines [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 312 | 331
Past Due Greater Than 30 Days and Accruing | 44 |
Nonaccrual TDRs | 930 | 1,050
Total TDRs | 1,286 | 1,381
Real Estate Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,139 | 390
Past Due Greater Than 30 Days and Accruing | 99 | 860
Nonaccrual TDRs | 1,505 | 1,717
Total TDRs | 2,743 | 2,967
Real Estate Loans [Member] | Construction and Land [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 177 | 562
Total TDRs | 177 | 562
Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,567 | 1,853
Nonaccrual TDRs | 6,352 | 7,256
Total TDRs | 7,919 | 9,109
Other Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,567 | 1,853
Nonaccrual TDRs | 6,160 | 7,088
Total TDRs | 7,727 | 8,941
Other Loans [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual TDRs | 192 | 168
Total TDRs | 192 | 168
Originated Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 789 | 1,271
Past Due Greater Than 30 Days and Accruing | 210 |
Nonaccrual TDRs | 8,937 | 9,975
Total TDRs | 9,936 | 11,246
Originated Loans [Member] | Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 789 | 1,271
Past Due Greater Than 30 Days and Accruing | 210 |
Nonaccrual TDRs | 2,828 | 3,032
Total TDRs | 3,827 | 4,303
Originated Loans [Member] | Real Estate Loans [Member] | One- to Four-Family First Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 300 | 276
Past Due Greater Than 30 Days and Accruing | 67 |
Nonaccrual TDRs | 487 | 327
Total TDRs | 854 | 603
Originated Loans [Member] | Real Estate Loans [Member] | Home Equity Loans and Lines [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 312 | 331
Past Due Greater Than 30 Days and Accruing | 44 |
Nonaccrual TDRs | 836 | 988
Total TDRs | 1,192 | 1,319
Originated Loans [Member] | Real Estate Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current |  | 102
Past Due Greater Than 30 Days and Accruing | 99 |
Nonaccrual TDRs | 1,505 | 1,717
Total TDRs | 1,604 | 1,819
Originated Loans [Member] | Real Estate Loans [Member] | Construction and Land [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 177 | 562
Total TDRs | 177 | 562
Originated Loans [Member] | Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual TDRs | 6,109 | 6,943
Total TDRs | 6,109 | 6,943
Originated Loans [Member] | Other Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual TDRs | 5,917 | 6,775
Total TDRs | 5,917 | 6,775
Originated Loans [Member] | Other Loans [Member] | Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual TDRs | 192 | 168
Total TDRs | 192 | 168
Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current |  | 2,433
Past Due Greater Than 30 Days and Accruing |  | 946
Nonaccrual TDRs |  | 435
Total TDRs |  | 3,814
Acquired Loans [Member] | Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current |  | 580
Past Due Greater Than 30 Days and Accruing |  | 946
Nonaccrual TDRs |  | 122
Total TDRs |  | 1,648
Acquired Loans [Member] | Real Estate Loans [Member] | One- to Four-Family First Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current |  | 292
Past Due Greater Than 30 Days and Accruing |  | 86
Nonaccrual TDRs |  | 60
Total TDRs |  | 438
Acquired Loans [Member] | Real Estate Loans [Member] | Home Equity Loans and Lines [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual TDRs |  | 62
Total TDRs |  | 62
Acquired Loans [Member] | Real Estate Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current |  | 288
Past Due Greater Than 30 Days and Accruing |  | 860
Total TDRs |  | 1,148
Acquired Loans [Member] | Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current |  | 1,853
Nonaccrual TDRs |  | 313
Total TDRs |  | 2,166
Acquired Loans [Member] | Other Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current |  | 1,853
Nonaccrual TDRs |  | 313
Total TDRs |  | $ 2,166
Non-Covered Acquired Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 2,924 |
Past Due Greater Than 30 Days and Accruing | 4 |
Nonaccrual TDRs | 457 |
Total TDRs | 3,385 |
Non-Covered Acquired Loans [Member] | Real Estate Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,357 |
Past Due Greater Than 30 Days and Accruing | 4 |
Nonaccrual TDRs | 214 |
Total TDRs | 1,575 |
Non-Covered Acquired Loans [Member] | Real Estate Loans [Member] | One- to Four-Family First Mortgage [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 218 |
Past Due Greater Than 30 Days and Accruing | 4 |
Nonaccrual TDRs | 120 |
Total TDRs | 342 |
Non-Covered Acquired Loans [Member] | Real Estate Loans [Member] | Home Equity Loans and Lines [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Nonaccrual TDRs | 94 |
Total TDRs | 94 |
Non-Covered Acquired Loans [Member] | Real Estate Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,139 |
Total TDRs | 1,139 |
Non-Covered Acquired Loans [Member] | Other Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,567 |
Nonaccrual TDRs | 243 |
Total TDRs | 1,810 |
Non-Covered Acquired Loans [Member] | Other Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 1,567 |
Nonaccrual TDRs | 243 |
Total TDRs | $ 1,810 |

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