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Non-performing Assets and Impaired Loans - Commercial Loans Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance total $ 2,250 $ 7,005 $ 11,053
Total ending loans balance 2,250 7,019 11,055
Allowance For Loan Loss Allocated 4 202 1,589
Average Balance in Impaired Loans total 2,905 7,110 5,277
Cash/Accrual Interest Income Recognized, Total 95 58 379
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 2,219 6,428 3,216
Recorded Investment With no recorded allowance 2,218 6,442 3,218
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 2,900 6,699 2,343
Cash/Accrual Interest Income Recognized, With no recorded allowance 93 37 143
Unpaid Principal Balance With an allowance recorded 31 577 7,837
Recorded Investment With an allowance recorded 32 577 7,837
Allowance For Loan Loss Allocated 4 202 1,589
Average Balance in Impaired Loans With an allowance recorded 5 411 2,934
Cash/Accrual Interest Income Recognized, With an allowance recorded 2 21 236
Commercial [Member] | Owner Occupied Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 1,533 1,340 1,169
Recorded Investment With no recorded allowance 1,533 1,339 1,170
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 1,619 1,001 645
Cash/Accrual Interest Income Recognized, With no recorded allowance 58 22 65
Unpaid Principal Balance With an allowance recorded   410 422
Recorded Investment With an allowance recorded   410 422
Allowance For Loan Loss Allocated   105 165
Average Balance in Impaired Loans With an allowance recorded   243 141
Cash/Accrual Interest Income Recognized, With an allowance recorded   8 16
Commercial [Member] | Non Owner Occupied Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 440 4,938 1,193
Recorded Investment With no recorded allowance 440 4,953 1,194
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 871 5,417 1,341
Cash/Accrual Interest Income Recognized, With no recorded allowance 18 8 51
Unpaid Principal Balance With an allowance recorded   70 6,453
Recorded Investment With an allowance recorded   70 6,453
Allowance For Loan Loss Allocated   32 744
Average Balance in Impaired Loans With an allowance recorded   6 1,995
Cash/Accrual Interest Income Recognized, With an allowance recorded   13 208
Commercial [Member] | Residential Development [Member]      
Financing Receivable, Impaired [Line Items]      
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Commercial [Member] | Development & Spec Land Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 118 71  
Recorded Investment With no recorded allowance 118 71  
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 61 6  
Cash/Accrual Interest Income Recognized, With no recorded allowance 16 3  
Commercial [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 128 79 854
Recorded Investment With no recorded allowance 127 79 854
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 349 275 357
Cash/Accrual Interest Income Recognized, With no recorded allowance 1 4 27
Unpaid Principal Balance With an allowance recorded 31 97 962
Recorded Investment With an allowance recorded 32 97 962
Allowance For Loan Loss Allocated 4 65 680
Average Balance in Impaired Loans With an allowance recorded 5 $ 162 798
Cash/Accrual Interest Income Recognized, With an allowance recorded $ 2   $ 12