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Loans - Schedule of Allowances for Loan Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance $ 5,907 $ 5,604
Provision for loan losses 285 324
Charge-offs (70) (303)
Recoveries 165 8
Net charge-offs 95 (295)
Ending balance 6,287 5,633
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 2,178 1,813
Provision for loan losses (339) 257
Charge-offs (5) (194)
Recoveries 163 8
Net charge-offs 158 (186)
Ending balance 1,997 1,884
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 1,791 1,735
Provision for loan losses 17 26
Charge-offs   (62)
Net charge-offs   (62)
Ending balance 1,808 1,699
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 1,245 1,273
Provision for loan losses (24) (40)
Charge-offs   (37)
Recoveries 1  
Net charge-offs 1 (37)
Ending balance 1,222 1,196
Construction & Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 258 237
Provision for loan losses (88) 7
Ending balance 170 244
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 306 175
Provision for loan losses 83 23
Charge-offs (65) (10)
Recoveries 1  
Net charge-offs (64) (10)
Ending balance 325 188
Unallocated [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 129 371
Provision for loan losses 636 51
Ending balance $ 765 $ 422