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Loans - Loans Individually Evaluated for Impairment by Portfolio Class of Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment $ 1,393 $ 2,420 $ 1,915 $ 2,420
With a specific allowance recorded, Recorded Investment 4,795 641 254 641
Related Allowance 766 197 59 197
Recorded Investment 6,188 3,061 2,169 3,061
Average Recorded Investment 4,314 3,120 2,135 2,649
Consumer Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 644 648 648 648
With no related allowance recorded, Unpaid Principal Balance 644 648 648 648
With no related allowance recorded, Average Recorded Investment 649   603 626
With no related allowance recorded, Interest Income Recognized 5   7 32
With no related allowance recorded, Interest Income Recognized Cash Basis 4   1 9
With a specific allowance recorded, Recorded Investment 194 181 254 181
With a specific allowance recorded, Unpaid Principal Balance 194 184 254 184
Related Allowance 34 30 59 30
With a specific allowance recorded, Average Recorded Investment 212   254 211
Recorded Investment 838 829 902 829
Unpaid Principal Balance 838 832 902 832
Average Recorded Investment 861   857 837
Interest Income Recognized 5   7 32
Interest Income Recognized Cash Basis 4   1 9
Agricultural Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 30      
With no related allowance recorded, Unpaid Principal Balance 30      
With no related allowance recorded, Average Recorded Investment 291     204
With no related allowance recorded, Interest Income Recognized 3      
With a specific allowance recorded, Recorded Investment 92      
With a specific allowance recorded, Unpaid Principal Balance 92      
Related Allowance 15      
With a specific allowance recorded, Average Recorded Investment 93     22
With a specific allowance recorded, Interest Income Recognized 2     1
Recorded Investment 122      
Unpaid Principal Balance 122      
Average Recorded Investment 384     226
Interest Income Recognized 5     1
Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 348 491   491
With no related allowance recorded, Unpaid Principal Balance 348 491   491
With no related allowance recorded, Average Recorded Investment 386     124
With no related allowance recorded, Interest Income Recognized 5      
With a specific allowance recorded, Recorded Investment 121 200   200
With a specific allowance recorded, Unpaid Principal Balance 121 200   200
Related Allowance 12 21   21
With a specific allowance recorded, Average Recorded Investment 121     29
Recorded Investment 469 691   691
Unpaid Principal Balance 469 691   691
Average Recorded Investment 507     153
Interest Income Recognized 5      
Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 186 299 192 299
With no related allowance recorded, Unpaid Principal Balance 186 299 192 299
With no related allowance recorded, Average Recorded Investment 224   193 238
With no related allowance recorded, Interest Income Recognized 3   3 19
With a specific allowance recorded, Recorded Investment 3,109      
With a specific allowance recorded, Unpaid Principal Balance 3,109      
Related Allowance 95      
With a specific allowance recorded, Average Recorded Investment 1,036      
With a specific allowance recorded, Interest Income Recognized 39      
Recorded Investment 3,295 299 192 299
Unpaid Principal Balance 3,295 299 192 299
Average Recorded Investment 1,260   193 238
Interest Income Recognized 42   3 19
Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 154 982 1,075 982
With no related allowance recorded, Unpaid Principal Balance 154 982 1,075 982
With no related allowance recorded, Average Recorded Investment 699   1,085 637
With no related allowance recorded, Interest Income Recognized 12   15 66
With a specific allowance recorded, Recorded Investment 1,279 227   227
With a specific allowance recorded, Unpaid Principal Balance 1,429 377   377
Related Allowance 610 142   142
With a specific allowance recorded, Average Recorded Investment 572     555
With a specific allowance recorded, Interest Income Recognized 7      
Recorded Investment 1,433 1,209 1,075 1,209
Unpaid Principal Balance 1,583 1,359 1,075 1,359
Average Recorded Investment 1,271   1,085 1,192
Interest Income Recognized 19   $ 15 66
Consumer [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 31      
With no related allowance recorded, Unpaid Principal Balance 31      
With no related allowance recorded, Average Recorded Investment 10      
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 21     3
Recorded Investment 31 33   33
Unpaid Principal Balance 31 $ 33   33
Average Recorded Investment $ 31     $ 3