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Loans Receivable, Credit Quality for Loans and the Allowance for Loan Losses - Schedule of Impaired Loans by Loan Portfolio Segments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]          
Impaired loans with no related allowance recorded, recorded investment $ 7,550   $ 7,550   $ 8,424
Impaired loans with an allowance recorded, recorded investment 457   457   1,124
Impaired loans, recorded investment 8,007   8,007   9,548
Impaired loans with no related allowance recorded, unpaid principal balance 7,687   7,687   8,562
Impaired loans with an allowance recorded, unpaid principal balance 457   457   1,662
Impaired loans, unpaid principal balance 8,144   8,144   10,224
Impaired loans, related allowance 36   36   715
Impaired loans with no related allowance recorded, average recorded investment 7,768 $ 7,800 7,820 $ 7,716  
Impaired loans with an allowance recorded, average recorded investment 461 1,378 466 1,181  
Impaired loans, average recorded investment 8,229 9,178 8,286 8,897  
Impaired loans with no related allowance recorded, interest income recognized 86 134 172 225  
Impaired loans with an allowance recorded, interest income recognized 1 1 2 17  
Impaired loans, interest income recognized 87 135 174 242  
Home Equity Lines of Credit [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired loans with no related allowance recorded, recorded investment 361   361   400
Impaired loans, recorded investment 361   361   400
Impaired loans with no related allowance recorded, unpaid principal balance 361   361   400
Impaired loans, unpaid principal balance 361   361   400
Impaired loans with no related allowance recorded, average recorded investment 403 445 404 448  
Impaired loans, average recorded investment 403 445 404 448  
Impaired loans with no related allowance recorded, interest income recognized 4 16 7 16  
Impaired loans, interest income recognized 4 16 7 16  
Commercial [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired loans with no related allowance recorded, recorded investment 848   848   994
Impaired loans with an allowance recorded, recorded investment 131   131   793
Impaired loans, recorded investment 979   979   1,787
Impaired loans with no related allowance recorded, unpaid principal balance 848   848   994
Impaired loans with an allowance recorded, unpaid principal balance 131   131   1,193
Impaired loans, unpaid principal balance 979   979   2,187
Impaired loans, related allowance 1   1   700
Impaired loans with no related allowance recorded, average recorded investment 850 511 852 512  
Impaired loans with an allowance recorded, average recorded investment 132 1,062 134 866  
Impaired loans, average recorded investment 982 1,573 986 1,378  
Impaired loans with no related allowance recorded, interest income recognized 7 20 14 27  
Impaired loans with an allowance recorded, interest income recognized       15  
Impaired loans, interest income recognized 7 20 14 42  
Commercial Real Estate Non-owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired loans with no related allowance recorded, recorded investment 2,150   2,150   2,163
Impaired loans with an allowance recorded, recorded investment         24
Impaired loans, recorded investment 2,150   2,150   2,187
Impaired loans with no related allowance recorded, unpaid principal balance 2,150   2,150   2,163
Impaired loans with an allowance recorded, unpaid principal balance         155
Impaired loans, unpaid principal balance 2,150   2,150   2,318
Impaired loans, related allowance         1
Impaired loans with no related allowance recorded, average recorded investment 2,156 2,182 2,160 2,184  
Impaired loans, average recorded investment 2,156 2,182 2,160 2,184  
Impaired loans with no related allowance recorded, interest income recognized 20 20 39 39  
Impaired loans, interest income recognized 20 20 39 39  
Commercial Real Estate Owner Occupied [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired loans with no related allowance recorded, recorded investment 972   972   1,462
Impaired loans with an allowance recorded, recorded investment 207   207    
Impaired loans, recorded investment 1,179   1,179   1,462
Impaired loans with no related allowance recorded, unpaid principal balance 972   972   1,462
Impaired loans with an allowance recorded, unpaid principal balance 207   207    
Impaired loans, unpaid principal balance 1,179   1,179   1,462
Impaired loans, related allowance 2   2    
Impaired loans with no related allowance recorded, average recorded investment 976 1,198 981 1,007  
Impaired loans with an allowance recorded, average recorded investment 209   212    
Impaired loans, average recorded investment 1,185 1,198 1,193 1,007  
Impaired loans with no related allowance recorded, interest income recognized 18 31 37 46  
Impaired loans, interest income recognized 18 31 37 46  
Commercial Real Estate 1-4 Family Investment [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired loans with no related allowance recorded, recorded investment 854   854   879
Impaired loans with an allowance recorded, recorded investment         186
Impaired loans, recorded investment 854   854   1,065
Impaired loans with no related allowance recorded, unpaid principal balance 854   854   879
Impaired loans with an allowance recorded, unpaid principal balance         193
Impaired loans, unpaid principal balance 854   854   1,072
Impaired loans, related allowance 0   0   7
Impaired loans with no related allowance recorded, average recorded investment 861 814 868 817  
Impaired loans with an allowance recorded, average recorded investment   193   192  
Impaired loans, average recorded investment 861 1,007 868 1,009  
Impaired loans with no related allowance recorded, interest income recognized 7 6 14 11  
Impaired loans, interest income recognized 7 6 14 11  
Commercial Land and Land Development [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired loans with no related allowance recorded, average recorded investment   219   218  
Impaired loans, average recorded investment   219   218  
Residential Real Estate [Member]          
Financing Receivable, Impaired [Line Items]          
Impaired loans with no related allowance recorded, recorded investment 2,365   2,365   2,526
Impaired loans with an allowance recorded, recorded investment 119   119   121
Impaired loans, recorded investment 2,484   2,484   2,647
Impaired loans with no related allowance recorded, unpaid principal balance 2,502   2,502   2,644
Impaired loans with an allowance recorded, unpaid principal balance 119   119   121
Impaired loans, unpaid principal balance 2,621   2,621   2,785
Impaired loans, related allowance 33   33   $ 7
Impaired loans with no related allowance recorded, average recorded investment 2,522 2,431 2,555 2,530  
Impaired loans with an allowance recorded, average recorded investment 120 123 120 123  
Impaired loans, average recorded investment 2,642 2,554 2,675 2,653  
Impaired loans with no related allowance recorded, interest income recognized 30 41 61 86  
Impaired loans with an allowance recorded, interest income recognized 1 1 2 2  
Impaired loans, interest income recognized $ 31 $ 42 $ 63 $ 88