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Allowance for Loan Losses - Changes in the Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance $ 14,767 $ 13,679
Charge-offs (24) (239)
Recoveries 79 382
Provision 2,126  
Ending Balance 16,948 13,822
Commercial and Agriculture [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 2,219 1,747
Recoveries 1 1
Provision 180 86
Ending Balance 2,400 1,834
Commercial Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 2,541 1,962
Charge-offs   (60)
Recoveries 7 223
Provision 262 (146)
Ending Balance 2,810 1,979
Commercial Real Estate Non Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 6,584 5,803
Recoveries 3 14
Provision 1,030 172
Ending Balance 7,617 5,989
Residential Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 1,582 1,531
Charge-offs (23) (98)
Recoveries 48 124
Provision 343 (123)
Ending Balance 1,950 1,434
Real Estate Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 1,250 1,046
Charge-offs   (24)
Recoveries 1  
Provision 355 (51)
Ending Balance 1,606 971
Farm Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 344 397
Recoveries 2 1
Provision (36) (32)
Ending Balance 310 366
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 247 284
Charge-offs (1) (57)
Recoveries 17 19
Provision (17) 5
Ending Balance 246 251
Unallocated [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 0 909
Provision 9 89
Ending Balance $ 9 $ 998