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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