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Loans - Schedule of Allowances for Loan Losses by Portfolio Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance $ 5,604 $ 5,291
PROVISION (CREDIT) FOR LOAN LOSSES 324 (160)
Charge-offs (303) (13)
Recoveries 8 336
Net recoveries (charge-offs) (295) 323
Ending balance 5,633 5,454
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 1,813 2,207
PROVISION (CREDIT) FOR LOAN LOSSES 257 (831)
Charge-offs (194) (8)
Recoveries 8 336
Net recoveries (charge-offs) (186) 328
Ending balance 1,884 1,704
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 1,735 1,264
PROVISION (CREDIT) FOR LOAN LOSSES 26 274
Charge-offs (62)  
Net recoveries (charge-offs) (62)  
Ending balance 1,699 1,538
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 1,273 1,189
PROVISION (CREDIT) FOR LOAN LOSSES (40) 114
Charge-offs (37)  
Net recoveries (charge-offs) (37)  
Ending balance 1,196 1,303
Construction & Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 237 178
PROVISION (CREDIT) FOR LOAN LOSSES 7 6
Net recoveries (charge-offs) 0  
Ending balance 244 184
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 175 141
PROVISION (CREDIT) FOR LOAN LOSSES 23 29
Charge-offs (10) (5)
Net recoveries (charge-offs) (10) (5)
Ending balance 188 165
Unallocated [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning balance 371 312
PROVISION (CREDIT) FOR LOAN LOSSES 51 248
Ending balance $ 422 $ 560