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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, 2021
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 31, 2020
Financing Receivable, Impaired [Line Items]              
With a specific allowance recorded, Recorded Investment $ 8,976 $ 9,360 $ 9,872 $ 8,976 $ 9,872 $ 9,360  
Related Allowance 1,156 1,657 1,170 1,156 1,170 1,657  
Recorded Investment 12,039 14,532 12,567 12,039 12,567 14,532  
Average Recorded Investment 12,206 14,868 8,352 12,836 6,333 10,234  
With no related allowance recorded, Recorded Investment 3,063 5,172 2,695 3,063 2,695 5,172  
Consumer Real Estate [Member]              
Financing Receivable, Impaired [Line Items]              
With a specific allowance recorded, Recorded Investment   202 60   60 202  
With a specific allowance recorded, Unpaid Principal Balance   202 60   60 202  
Related Allowance   31 16   16 31 $ 16
With a specific allowance recorded, Average Recorded Investment 55   194 117 203 126  
With a specific allowance recorded, Interest Income Recognized     1   3    
With a specific allowance recorded, Interest Income Recognized Cash Basis     1   1 3  
Recorded Investment 770 1,001 847 770 847 1,001 847
Unpaid Principal Balance 823 1,001 847 823 847 1,001 847
Average Recorded Investment 549   818 618 840 864  
Interest Income Recognized 1   5 3 11 22  
Interest Income Recognized Cash Basis 3   1 7 4 13  
With no related allowance recorded, Recorded Investment 770 799 787 770 787 799  
With no related allowance recorded, Unpaid Principal Balance 823 799 787 823 787 799  
With no related allowance recorded, Average Recorded Investment 494   624 501 637 738  
With no related allowance recorded, Interest Income Recognized 1   4 3 8 22  
With no related allowance recorded, Interest Income Recognized Cash Basis 3     7 3 10  
Agricultural Real Estate [Member]              
Financing Receivable, Impaired [Line Items]              
With a specific allowance recorded, Recorded Investment 5,794 5,210 5,469 5,794 5,469 5,210  
With a specific allowance recorded, Unpaid Principal Balance 5,794 5,210 5,469 5,794 5,469 5,210  
Related Allowance 914 600 438 914 438 600 438
With a specific allowance recorded, Average Recorded Investment 5,556   1,884 5,357 988 3,175  
With a specific allowance recorded, Interest Income Recognized     1   3 6  
With a specific allowance recorded, Interest Income Recognized Cash Basis           102  
Recorded Investment 6,522 6,756 5,990 6,522 5,990 6,756 5,990
Unpaid Principal Balance 6,522 6,759 5,990 6,522 5,990 6,759 5,990
Average Recorded Investment 6,550   2,071 6,619 1,227 3,904  
Interest Income Recognized 22   6 44 10 24  
Interest Income Recognized Cash Basis           114  
With no related allowance recorded, Recorded Investment 728 1,546 521 728 521 1,546  
With no related allowance recorded, Unpaid Principal Balance 728 1,549 521 728 521 1,549  
With no related allowance recorded, Average Recorded Investment 994   187 1,262 239 729  
With no related allowance recorded, Interest Income Recognized 22   5 44 7 18  
With no related allowance recorded, Interest Income Recognized Cash Basis           12  
Agricultural [Member]              
Financing Receivable, Impaired [Line Items]              
With a specific allowance recorded, Recorded Investment 117 176 240 117 240 176  
With a specific allowance recorded, Unpaid Principal Balance 117 176 240 117 240 176  
Related Allowance 117 116 98 117 98 116 98
With a specific allowance recorded, Average Recorded Investment 39   161 127 141 188  
With a specific allowance recorded, Interest Income Recognized     9        
Recorded Investment 248 467 623 248 623 467 623
Unpaid Principal Balance 348 467 623 348 623 467 623
Average Recorded Investment 223   501 303 504 580  
Interest Income Recognized 4   13 6 8 3  
Interest Income Recognized Cash Basis           3  
With no related allowance recorded, Recorded Investment 131 291 383 131 383 291  
With no related allowance recorded, Unpaid Principal Balance 231 291 383 231 383 291  
With no related allowance recorded, Average Recorded Investment 184   340 176 363 392  
With no related allowance recorded, Interest Income Recognized 4   4 6 8 3  
With no related allowance recorded, Interest Income Recognized Cash Basis           3  
Commercial Real Estate [Member]              
Financing Receivable, Impaired [Line Items]              
With a specific allowance recorded, Recorded Investment 3,065 2,765 3,072 3,065 3,072 2,765  
With a specific allowance recorded, Unpaid Principal Balance 3,065 2,765 3,072 3,065 3,072 2,765  
Related Allowance 125 20 58 125 58 20 58
With a specific allowance recorded, Average Recorded Investment 3,087   3,085 2,002 2,061 2,524  
With a specific allowance recorded, Interest Income Recognized 27   39 54 78 128  
With a specific allowance recorded, Interest Income Recognized Cash Basis 3     3      
Recorded Investment 3,246 2,950 3,258 3,246 3,258 2,950 3,258
Unpaid Principal Balance 3,246 2,950 3,258 3,246 3,258 2,950 3,258
Average Recorded Investment 3,567   3,271 3,395 2,266 2,719  
Interest Income Recognized 31   39 62 82 141  
Interest Income Recognized Cash Basis 6     9      
With no related allowance recorded, Recorded Investment 181 185 186 181 186 185  
With no related allowance recorded, Unpaid Principal Balance 181 185 186 181 186 185  
With no related allowance recorded, Average Recorded Investment 480   186 1,393 205 195  
With no related allowance recorded, Interest Income Recognized 4     8 4 13  
With no related allowance recorded, Interest Income Recognized Cash Basis 3     6      
Commercial and Industrial [Member]              
Financing Receivable, Impaired [Line Items]              
With a specific allowance recorded, Recorded Investment   1,007 1,031   1,031 1,007  
With a specific allowance recorded, Unpaid Principal Balance   1,007 1,031   1,031 1,007  
Related Allowance   890 560   560 890 560
With a specific allowance recorded, Average Recorded Investment     1,095 335 834 916  
With a specific allowance recorded, Interest Income Recognized     11   27 52  
Recorded Investment 1,236 3,335 1,822 1,236 1,822 3,335 1,822
Unpaid Principal Balance 1,367 3,335 1,822 1,367 1,822 3,335 1,822
Average Recorded Investment 1,298   1,663 1,881 1,467 2,138  
Interest Income Recognized 6   15 23 33 78  
Interest Income Recognized Cash Basis 2     3   5  
With no related allowance recorded, Recorded Investment 1,236 2,328 791 1,236 791 2,328  
With no related allowance recorded, Unpaid Principal Balance 1,367 2,328 791 1,367 791 2,328  
With no related allowance recorded, Average Recorded Investment 1,298   568 1,546 633 1,222  
With no related allowance recorded, Interest Income Recognized 6   4 23 6 26  
With no related allowance recorded, Interest Income Recognized Cash Basis 2     3   5  
Consumer [Member]              
Financing Receivable, Impaired [Line Items]              
With a specific allowance recorded, Average Recorded Investment         10 11  
With a specific allowance recorded, Interest Income Recognized           1  
Recorded Investment 17 23 27 17 27 23 27
Unpaid Principal Balance 27 23 27 27 27 23 $ 27
Average Recorded Investment 19   28 20 29 27  
Interest Income Recognized         1 1  
With no related allowance recorded, Recorded Investment 17 23 27 17 27 23  
With no related allowance recorded, Unpaid Principal Balance 27 $ 23 27 27 27 23  
With no related allowance recorded, Average Recorded Investment $ 19   $ 28 $ 20 19 $ 16  
With no related allowance recorded, Interest Income Recognized         $ 1