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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment $ 5,134 $ 2,420 $ 1,914 $ 5,134 $ 1,914 $ 2,420
With a specific allowance recorded, Recorded Investment 10,125 641 1,314 10,125 1,314 641
Related Allowance 1,198 197 187 1,198 187 197
Recorded Investment 15,259 3,061 3,228 15,259 3,228 3,061
Average Recorded Investment 13,517 3,120 3,141 8,613 2,492 2,649
Consumer Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 780 648 626 780 626 648
With no related allowance recorded, Unpaid Principal Balance 780 648 626 780 626 648
With no related allowance recorded, Average Recorded Investment 791   628 688 625 626
With no related allowance recorded, Interest Income Recognized 41   9 120 24 32
With no related allowance recorded, Interest Income Recognized Cash Basis 5   3 9 7 9
With a specific allowance recorded, Recorded Investment 205 181 126 205 126 181
With a specific allowance recorded, Unpaid Principal Balance 205 184 128 205 128 184
Related Allowance 43 30 22 43 22 30
With a specific allowance recorded, Average Recorded Investment 119   172 60 220 211
With a specific allowance recorded, Interest Income Recognized 8     10    
Recorded Investment 985 829 752 985 752 829
Unpaid Principal Balance 985 832 754 985 754 832
Average Recorded Investment 910   800 748 845 837
Interest Income Recognized 49   9 130 24 32
Interest Income Recognized Cash Basis 5   3 9 7 9
Agricultural Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 1,589   406 1,589 406  
With no related allowance recorded, Unpaid Principal Balance 1,589   406 1,589 406  
With no related allowance recorded, Average Recorded Investment 873   406 451 135 204
With no related allowance recorded, Interest Income Recognized 2     6    
With a specific allowance recorded, Recorded Investment 5,425     5,425    
With a specific allowance recorded, Unpaid Principal Balance 5,425     5,425    
Related Allowance 432     432    
With a specific allowance recorded, Average Recorded Investment 5,450     2,475   22
With a specific allowance recorded, Interest Income Recognized 2     7   1
Recorded Investment 7,014   406 7,014 406  
Unpaid Principal Balance 7,014   406 7,014 406  
Average Recorded Investment 6,323   406 2,926 135 226
Interest Income Recognized 4     13   1
Agricultural [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 533 491 368 533 368 491
With no related allowance recorded, Unpaid Principal Balance 533 491 368 533 368 491
With no related allowance recorded, Average Recorded Investment 375   368 367 123 124
With no related allowance recorded, Interest Income Recognized 4     9    
With no related allowance recorded, Interest Income Recognized Cash Basis 1     1    
With a specific allowance recorded, Recorded Investment 188 200   188   200
With a specific allowance recorded, Unpaid Principal Balance 188 200   188   200
Related Allowance 28 21   28   21
With a specific allowance recorded, Average Recorded Investment 342     208 24 29
With a specific allowance recorded, Interest Income Recognized 3     6    
Recorded Investment 721 691 368 721 368 691
Unpaid Principal Balance 721 691 368 721 368 691
Average Recorded Investment 717   368 575 147 153
Interest Income Recognized 7     15    
Interest Income Recognized Cash Basis 1     1    
Commercial Real Estate [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 186 299 304 186 304 299
With no related allowance recorded, Unpaid Principal Balance 186 299 304 186 304 299
With no related allowance recorded, Average Recorded Investment 186   267 199 217 238
With no related allowance recorded, Interest Income Recognized 1   7 3 14 19
With a specific allowance recorded, Recorded Investment 3,033     3,033    
With a specific allowance recorded, Unpaid Principal Balance 3,033     3,033    
Related Allowance 44     44    
With a specific allowance recorded, Average Recorded Investment 3,046     2,389    
With a specific allowance recorded, Interest Income Recognized     14      
Recorded Investment 3,219 299 304 3,219 304 299
Unpaid Principal Balance 3,219 299 304 3,219 304 299
Average Recorded Investment 3,232   267 2,588 217 238
Interest Income Recognized 1   21 3 14 19
Commercial and Industrial [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 2,021 982 210 2,021 210 982
With no related allowance recorded, Unpaid Principal Balance 2,021 982 210 2,021 210 982
With no related allowance recorded, Average Recorded Investment 1,190   219 819 697 637
With no related allowance recorded, Interest Income Recognized 5   3 18 9 66
With a specific allowance recorded, Recorded Investment 1,274 227 1,188 1,274 1,188 227
With a specific allowance recorded, Unpaid Principal Balance 1,274 377 1,188 1,274 1,188 377
Related Allowance 651 142 165 651 165 142
With a specific allowance recorded, Average Recorded Investment 1,119   1,081 929 451 555
With a specific allowance recorded, Interest Income Recognized 3     10 37  
Recorded Investment 3,295 1,209 1,398 3,295 1,398 1,209
Unpaid Principal Balance 3,295 1,359 1,398 3,295 1,398 1,359
Average Recorded Investment 2,309   1,300 1,748 1,148 1,192
Interest Income Recognized 8   $ 3 28 $ 46 66
Consumer [Member]            
Financing Receivable, Impaired [Line Items]            
With no related allowance recorded, Recorded Investment 25     25    
With no related allowance recorded, Unpaid Principal Balance 25     25    
With no related allowance recorded, Average Recorded Investment 26     21    
With no related allowance recorded, Interest Income Recognized 21     37    
With a specific allowance recorded, Recorded Investment   33       33
With a specific allowance recorded, Unpaid Principal Balance   33       33
Related Allowance   4       4
With a specific allowance recorded, Average Recorded Investment       7   3
Recorded Investment 25 33   25   33
Unpaid Principal Balance 25 $ 33   25   33
Average Recorded Investment 26     28   $ 3
Interest Income Recognized $ 21     $ 37