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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, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment $ 6,604 $ 5,172 $ 1,393 $ 5,172
With a specific allowance recorded, Recorded Investment 5,532 9,360 4,795 9,360
Related Allowance 1,109 1,657 766 1,657
Recorded Investment 12,136 14,532 6,188 14,532
Average Recorded Investment 13,467 14,868 4,314 10,234
Consumer Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 817 799 644 799
With no related allowance recorded, Unpaid Principal Balance 817 799 644 799
With no related allowance recorded, Average Recorded Investment 508   649 738
With no related allowance recorded, Interest Income Recognized 1   5 22
With no related allowance recorded, Interest Income Recognized Cash Basis 2   4 10
With a specific allowance recorded, Recorded Investment 134 202 194 202
With a specific allowance recorded, Unpaid Principal Balance 134 202 194 202
Related Allowance 23 31 34 31
With a specific allowance recorded, Average Recorded Investment 179   212 126
With a specific allowance recorded, Interest Income Recognized Cash Basis 2     3
Recorded Investment 951 1,001 838 1,001
Unpaid Principal Balance 951 1,001 838 1,001
Average Recorded Investment 687   861 864
Interest Income Recognized 1   5 22
Interest Income Recognized Cash Basis 4   4 13
Agricultural Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 1,526 1,546 30 1,546
With no related allowance recorded, Unpaid Principal Balance 1,526 1,549 30 1,549
With no related allowance recorded, Average Recorded Investment 1,531   291 729
With no related allowance recorded, Interest Income Recognized 23   3 18
With no related allowance recorded, Interest Income Recognized Cash Basis       12
With a specific allowance recorded, Recorded Investment 5,106 5,210 92 5,210
With a specific allowance recorded, Unpaid Principal Balance 5,106 5,210 92 5,210
Related Allowance 1,086 600 15 600
With a specific allowance recorded, Average Recorded Investment 5,160   93 3,175
With a specific allowance recorded, Interest Income Recognized     2 6
With a specific allowance recorded, Interest Income Recognized Cash Basis       102
Recorded Investment 6,632 6,756 122 6,756
Unpaid Principal Balance 6,632 6,759 122 6,759
Average Recorded Investment 6,691   384 3,904
Interest Income Recognized 23   5 24
Interest Income Recognized Cash Basis       114
Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment   291 348 291
With no related allowance recorded, Unpaid Principal Balance   291 348 291
With no related allowance recorded, Average Recorded Investment 168   386 392
With no related allowance recorded, Interest Income Recognized     5 3
With no related allowance recorded, Interest Income Recognized Cash Basis       3
With a specific allowance recorded, Recorded Investment 292 176 121 176
With a specific allowance recorded, Unpaid Principal Balance 292 176 121 176
Related Allowance   116 12 116
With a specific allowance recorded, Average Recorded Investment 214   121 188
With a specific allowance recorded, Interest Income Recognized 4      
Recorded Investment 292 467 469 467
Unpaid Principal Balance 292 467 469 467
Average Recorded Investment 382   507 580
Interest Income Recognized 4   5 3
Interest Income Recognized Cash Basis       3
Commercial Real Estate [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 2,905 185 186 185
With no related allowance recorded, Unpaid Principal Balance 2,905 185 186 185
With no related allowance recorded, Average Recorded Investment 2,306   224 195
With no related allowance recorded, Interest Income Recognized 31   3 13
With no related allowance recorded, Interest Income Recognized Cash Basis 3      
With a specific allowance recorded, Recorded Investment   2,765 3,109 2,765
With a specific allowance recorded, Unpaid Principal Balance   2,765 3,109 2,765
Related Allowance   20 95 20
With a specific allowance recorded, Average Recorded Investment 917   1,036 2,524
With a specific allowance recorded, Interest Income Recognized     39 128
Recorded Investment 2,905 2,950 3,295 2,950
Unpaid Principal Balance 2,905 2,950 3,295 2,950
Average Recorded Investment 3,223   1,260 2,719
Interest Income Recognized 31   42 141
Interest Income Recognized Cash Basis 3      
Commercial and Industrial [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 1,335 2,328 154 2,328
With no related allowance recorded, Unpaid Principal Balance 1,467 2,328 154 2,328
With no related allowance recorded, Average Recorded Investment 1,793   699 1,222
With no related allowance recorded, Interest Income Recognized 17   12 26
With no related allowance recorded, Interest Income Recognized Cash Basis 1     5
With a specific allowance recorded, Recorded Investment   1,007 1,279 1,007
With a specific allowance recorded, Unpaid Principal Balance   1,007 1,429 1,007
Related Allowance   890 610 890
With a specific allowance recorded, Average Recorded Investment 670   572 916
With a specific allowance recorded, Interest Income Recognized     7 52
Recorded Investment 1,335 3,335 1,433 3,335
Unpaid Principal Balance 1,467 3,335 1,583 3,335
Average Recorded Investment 2,463   1,271 2,138
Interest Income Recognized 17   19 78
Interest Income Recognized Cash Basis 1     5
Consumer [Member]        
Financing Receivable, Impaired [Line Items]        
With no related allowance recorded, Recorded Investment 21 23 31 23
With no related allowance recorded, Unpaid Principal Balance 21 23 31 23
With no related allowance recorded, Average Recorded Investment 21   10 16
With a specific allowance recorded, Average Recorded Investment     21 11
With a specific allowance recorded, Interest Income Recognized       1
Recorded Investment 21 23 31 23
Unpaid Principal Balance 21 $ 23 31 23
Average Recorded Investment $ 21   $ 31 27
Interest Income Recognized       $ 1