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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance total $ 7,347 $ 6,696 $ 7,141
Total ending loans balance 7,351 6,697 7,172
Allowance For Loan Loss Allocated 541 1,035 184
Average Balance in Impaired Loans total 10,395 7,368 3,774
Cash/Accrual Interest Income Recognized, Total 490 128 86
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 6,061 4,968 6,210
Recorded Investment With no recorded allowance 6,064 4,969 6,241
Average Balance in Impaired Loans With no recorded allowance 9,040 5,454 3,696
Cash/Accrual Interest Income Recognized, With no recorded allowance 444 110 40
Unpaid Principal Balance With an allowance recorded 1,286 1,728 931
Recorded Investment With an allowance recorded 1,287 1,728 931
Allowance For Loan Loss Allocated 541 1,035 184
Average Balance in Impaired Loans With an allowance recorded 1,355 1,914 78
Cash/Accrual Interest Income Recognized, With an allowance recorded 46 18 46
Commercial [Member] | Owner Occupied Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 3,192 2,814 1,255
Recorded Investment With no recorded allowance 3,193 2,815 1,270
Average Balance in Impaired Loans With no recorded allowance 3,608 3,168 1,168
Cash/Accrual Interest Income Recognized, With no recorded allowance 246 77 4
Unpaid Principal Balance With an allowance recorded   827 704
Recorded Investment With an allowance recorded   827 704
Allowance For Loan Loss Allocated   145 78
Average Balance in Impaired Loans With an allowance recorded   864 59
Cash/Accrual Interest Income Recognized, With an allowance recorded     33
Commercial [Member] | Non Owner Occupied Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 937 860 3,123
Recorded Investment With no recorded allowance 937 860 3,139
Average Balance in Impaired Loans With no recorded allowance 2,810 1,096 850
Cash/Accrual Interest Income Recognized, With no recorded allowance 98 12 7
Unpaid Principal Balance With an allowance recorded 119 186 227
Recorded Investment With an allowance recorded 119 186 227
Allowance For Loan Loss Allocated 25 30 106
Average Balance in Impaired Loans With an allowance recorded 130 180 19
Cash/Accrual Interest Income Recognized, With an allowance recorded   4 13
Commercial [Member] | Development & Spec Land [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 73 68 176
Recorded Investment With no recorded allowance 73 68 176
Average Balance in Impaired Loans With no recorded allowance 158 71 233
Cash/Accrual Interest Income Recognized, With no recorded allowance     4
Commercial [Member] | Commercial and Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Unpaid Principal Balance With no recorded allowance 1,859 1,226 1,656
Recorded Investment With no recorded allowance 1,861 1,226 1,656
Average Balance in Impaired Loans With no recorded allowance 2,464 1,119 1,445
Cash/Accrual Interest Income Recognized, With no recorded allowance 100 21 $ 25
Unpaid Principal Balance With an allowance recorded 1,167 715  
Recorded Investment With an allowance recorded 1,168 715  
Allowance For Loan Loss Allocated 516 860  
Average Balance in Impaired Loans With an allowance recorded 1,225 870  
Cash/Accrual Interest Income Recognized, With an allowance recorded $ 46 $ 14