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Allowance for Loan Losses - Components of Impaired Loans Held-for-Investment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Commercial Loans [Member]    
Financing Receivable Impaired [Line Items]    
Recorded Investment $ 831 $ 613
Unpaid Principal Balance 1,018 834
Average Recorded Investment 840 622
Commercial Loans [Member] | Commercial Real Estate Owner Occupied    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With No Related Allowance 327  
Unpaid Principal Balance, With No Related Allowance 506  
Average Recorded Investment, With No Related Allowance 330  
Commercial Loans [Member] | Commercial Real Estate Non-Owner Occupied    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With No Related Allowance 504 613
Unpaid Principal Balance, With No Related Allowance 512 834
Average Recorded Investment, With No Related Allowance 510 622
Consumer Loans [Member]    
Financing Receivable Impaired [Line Items]    
Recorded Investment 3,236 3,289
Unpaid Principal Balance 3,628 3,425
Average Recorded Investment 3,266 3,318
Consumer Loans [Member] | Residential Real Estate Loans [Member]    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With No Related Allowance 3,022 3,110
Unpaid Principal Balance, With No Related Allowance 3,386 3,237
Average Recorded Investment, With No Related Allowance 3,047 3,134
Consumer Loans [Member] | Home Equity Term Loans [Member]    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With No Related Allowance 68 83
Unpaid Principal Balance, With No Related Allowance 83 92
Average Recorded Investment, With No Related Allowance 68 85
Consumer Loans [Member] | Home Equity Lines of Credit [Member]    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With No Related Allowance 68  
Unpaid Principal Balance, With No Related Allowance 72  
Average Recorded Investment, With No Related Allowance 70  
Consumer Loans [Member] | Other [Member]    
Financing Receivable Impaired [Line Items]    
Recorded Investment, With No Related Allowance 78 96
Unpaid Principal Balance, With No Related Allowance 87 96
Average Recorded Investment, With No Related Allowance $ 81 $ 99