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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 1,071 $ 1,808 $ 804 $ 1,071 $ 804 $ 1,808
With a specific allowance recorded, Recorded Investment 1,105 246 648 1,105 648 246
Related Allowance 235 31 132 235 132 31
Recorded Investment 2,176 2,054 1,452 2,176 1,452 2,054
Average Recorded Investment 2,201 $ 2,533 1,452 2,168 1,570 $ 1,958
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 643   606 643 606  
With no related allowance recorded, Unpaid Principal Balance 643   606 643 606  
With no related allowance recorded, Average Recorded Investment 644   526 624 509  
With no related allowance recorded, Interest Income Recognized 8   6 15 14  
With no related allowance recorded, Interest Income Recognized Cash Basis 3   4 4 10  
With a specific allowance recorded, Recorded Investment 219   254 219 254  
With a specific allowance recorded, Unpaid Principal Balance 219   254 219 254  
Related Allowance 54   46 54 46  
With a specific allowance recorded, Average Recorded Investment 235   152 244 116  
Recorded Investment 862   860 862 860  
Unpaid Principal Balance 862   860 862 860  
Average Recorded Investment 879   678 868 625  
Interest Income Recognized 8   6 15 14  
Interest Income Recognized Cash Basis 3   4 4 10  
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Average Recorded Investment         34  
Average Recorded Investment         34  
Agricultural [Member]            
Financing Receivable, Impaired [Line Items]            
With a specific allowance recorded, Recorded Investment 74     74    
With a specific allowance recorded, Unpaid Principal Balance 74     74    
Related Allowance 26     26    
With a specific allowance recorded, Average Recorded Investment 74     37    
Recorded Investment 74     74    
Unpaid Principal Balance 74     74    
Average Recorded Investment 74     37    
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 191   198 191 198  
With no related allowance recorded, Unpaid Principal Balance 191   198 191 198  
With no related allowance recorded, Average Recorded Investment 191   199 192 200  
With no related allowance recorded, Interest Income Recognized 3   3 7 5  
With a specific allowance recorded, Average Recorded Investment     139   279  
Recorded Investment 191   198 191 198  
Unpaid Principal Balance 191   198 191 198  
Average Recorded Investment 191   338 192 479  
Interest Income Recognized 3   3 7 5  
Commercial and Industrial [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 237     237    
With no related allowance recorded, Unpaid Principal Balance 237     237    
With no related allowance recorded, Average Recorded Investment 787     936 104  
With no related allowance recorded, Interest Income Recognized 3     6    
With a specific allowance recorded, Recorded Investment 812   394 812 394  
With a specific allowance recorded, Unpaid Principal Balance 812   394 812 394  
Related Allowance 155   86 155 86  
With a specific allowance recorded, Average Recorded Investment 270   436 135 328  
With a specific allowance recorded, Interest Income Recognized 12   4 23 8  
Recorded Investment 1,049   394 1,049 394  
Unpaid Principal Balance 1,049   394 1,049 394  
Average Recorded Investment 1,057   436 1,071 432  
Interest Income Recognized $ 15   $ 4 $ 29 $ 8