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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance total $ 7,141 $ 2,250 $ 7,005
Total ending loans balance 7,187 2,250 7,019
Allowance For Loan Loss Allocated 184 4 202
Average Balance in Impaired Loans total 3,774 2,905 7,110
Cash/Accrual Interest Income Recognized, Total 86 95 58
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 6,210 2,219 6,428
Recorded Investment With no recorded allowance 6,256 2,218 6,442
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 3,696 2,900 6,699
Cash/Accrual Interest Income Recognized, With no recorded allowance 40 93 37
Unpaid Principal Balance With an allowance recorded 931 31 577
Recorded Investment With an allowance recorded 931 32 577
Allowance For Loan Loss Allocated 184 4 202
Average Balance in Impaired Loans With an allowance recorded 78 5 411
Cash/Accrual Interest Income Recognized, With an allowance recorded 46 2 21
Commercial [Member] | Owner Occupied Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 3,824 1,533 1,340
Recorded Investment With no recorded allowance 3,849 1,533 1,339
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 1,673 1,619 1,001
Cash/Accrual Interest Income Recognized, With no recorded allowance 11 58 22
Unpaid Principal Balance With an allowance recorded 931   410
Recorded Investment With an allowance recorded 931   410
Allowance For Loan Loss Allocated 184   105
Average Balance in Impaired Loans With an allowance recorded 78   243
Cash/Accrual Interest Income Recognized, With an allowance recorded 46   8
Commercial [Member] | Non Owner Occupied Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 554 440 4,938
Recorded Investment With no recorded allowance 570 440 4,953
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 345 871 5,417
Cash/Accrual Interest Income Recognized, With no recorded allowance   18 8
Unpaid Principal Balance With an allowance recorded     70
Recorded Investment With an allowance recorded     70
Allowance For Loan Loss Allocated     32
Average Balance in Impaired Loans With an allowance recorded     6
Cash/Accrual Interest Income Recognized, With an allowance recorded     13
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 176 118 71
Recorded Investment With no recorded allowance 174 118 71
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 233 61 6
Cash/Accrual Interest Income Recognized, With no recorded allowance 4 16 3
Commercial [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 1,656 128 79
Recorded Investment With no recorded allowance 1,663 127 79
Allowance For Loan Loss Allocated With no recorded allowance 0 0 0
Average Balance in Impaired Loans With no recorded allowance 1,445 349 275
Cash/Accrual Interest Income Recognized, With no recorded allowance $ 25 1 4
Unpaid Principal Balance With an allowance recorded   31 97
Recorded Investment With an allowance recorded   32 97
Allowance For Loan Loss Allocated   4 65
Average Balance in Impaired Loans With an allowance recorded   5 $ 162
Cash/Accrual Interest Income Recognized, With an allowance recorded   $ 2