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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance total $ 6,696 $ 7,141 $ 2,250
Total ending loans balance 6,708 7,187 2,250
Allowance For Loan Loss Allocated 1,035 184 4
Average Balance in Impaired Loans total 7,368 3,774 2,905
Cash/Accrual Interest Income Recognized, Total 128 86 95
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 4,968 6,210 2,219
Recorded Investment With no recorded allowance 4,980 6,256 2,218
Average Balance in Impaired Loans With no recorded allowance 5,454 3,696 2,900
Cash/Accrual Interest Income Recognized, With no recorded allowance 110 40 93
Unpaid Principal Balance With an allowance recorded 1,728 931 31
Recorded Investment With an allowance recorded 1,728 931 32
Allowance For Loan Loss Allocated 1,035 184 4
Average Balance in Impaired Loans With an allowance recorded 1,914 78 5
Cash/Accrual Interest Income Recognized, With an allowance recorded 18 46 2
Commercial [Member] | Owner Occupied Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 2,696 3,824 1,533
Recorded Investment With no recorded allowance 2,689 3,849 1,533
Average Balance in Impaired Loans With no recorded allowance 3,048 1,673 1,619
Cash/Accrual Interest Income Recognized, With no recorded allowance 71 11 58
Unpaid Principal Balance With an allowance recorded 827 931  
Recorded Investment With an allowance recorded 828 931  
Allowance For Loan Loss Allocated 145 184  
Average Balance in Impaired Loans With an allowance recorded 864 78  
Cash/Accrual Interest Income Recognized, With an allowance recorded   46  
Commercial [Member] | Non Owner Occupied Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 860 554 440
Recorded Investment With no recorded allowance 888 570 440
Average Balance in Impaired Loans With no recorded allowance 1,096 345 871
Cash/Accrual Interest Income Recognized, With no recorded allowance 12   18
Unpaid Principal Balance With an allowance recorded 186    
Recorded Investment With an allowance recorded 186    
Allowance For Loan Loss Allocated 30    
Average Balance in Impaired Loans With an allowance recorded 180    
Cash/Accrual Interest Income Recognized, With an allowance recorded 4    
Commercial [Member] | Development & Spec Land [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 68 176 118
Recorded Investment With no recorded allowance 66 174 118
Average Balance in Impaired Loans With no recorded allowance 71 233 61
Cash/Accrual Interest Income Recognized, With no recorded allowance   4 16
Commercial [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 1,344 1,656 128
Recorded Investment With no recorded allowance 1,337 1,663 127
Average Balance in Impaired Loans With no recorded allowance 1,239 1,445 349
Cash/Accrual Interest Income Recognized, With no recorded allowance 27 25 1
Unpaid Principal Balance With an allowance recorded 715   31
Recorded Investment With an allowance recorded 714   32
Allowance For Loan Loss Allocated 860   4
Average Balance in Impaired Loans With an allowance recorded 870 $ 0 5
Cash/Accrual Interest Income Recognized, With an allowance recorded $ 14   $ 2