v3.26.1
Loans and Allowance for Credit Losses - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing Receivable Impaired [Line Items]          
With no related allowance recorded, Unpaid Principal Balance $ 18,929   $ 18,929   $ 8,486
With no related allowance recorded, Recorded Investment 17,414   17,414   6,284
With related allowance recorded, Unpaid Principal Balance 52,543   52,543   39,540
With related allowance recorded, Recorded Investment 43,060   43,060   33,992
With an allowance recorded, Allowance for Credit Losses Allocated 8,260   8,260   5,365
Unpaid Principal Balance 71,472   71,472   48,026
Recorded Investment 60,474   60,474   40,276
With no related allowance recorded, Average Recorded Investment 14,675 $ 14,416 11,878 $ 11,304  
With no related allowance recorded, Interest Income Recognized 78 149 174 181  
With an allowance recorded, Average Recorded Investment 41,783 21,146 39,186 21,421  
With an allowance recorded, Interest Income Recognized 40 55 44 60  
Average Recorded Investment 56,458 35,562 51,064 32,725  
Interest Income Recognized 118 204 218 241  
Commercial Real Estate [Member]          
Financing Receivable Impaired [Line Items]          
With no related allowance recorded, Unpaid Principal Balance 8,171   8,171   3,795
With no related allowance recorded, Recorded Investment 7,664   7,664   3,734
With related allowance recorded, Unpaid Principal Balance 14,402   14,402   7,461
With related allowance recorded, Recorded Investment 13,009   13,009   6,758
With an allowance recorded, Allowance for Credit Losses Allocated 2,836   2,836   1,639
With no related allowance recorded, Average Recorded Investment 6,005 3,295 5,248 3,219  
With no related allowance recorded, Interest Income Recognized 34 8 34 8  
With an allowance recorded, Average Recorded Investment 12,321 5,416 10,467 5,074  
With an allowance recorded, Interest Income Recognized 8 32 8 32  
Commercial and Industrial [Member]          
Financing Receivable Impaired [Line Items]          
With no related allowance recorded, Unpaid Principal Balance 3,573   3,573   2,146
With no related allowance recorded, Recorded Investment 3,386   3,386   707
With related allowance recorded, Unpaid Principal Balance 31,377   31,377   24,794
With related allowance recorded, Recorded Investment 23,779   23,779   20,820
With an allowance recorded, Allowance for Credit Losses Allocated 3,912   3,912   2,303
With no related allowance recorded, Average Recorded Investment 2,898 8,584 2,168 5,723  
With no related allowance recorded, Interest Income Recognized 6 125 101 125  
With an allowance recorded, Average Recorded Investment 23,258 7,802 22,445 7,801  
With an allowance recorded, Interest Income Recognized 26 13 30 17  
Residential Real Estate [Member]          
Financing Receivable Impaired [Line Items]          
With no related allowance recorded, Unpaid Principal Balance 2,079   2,079   610
With no related allowance recorded, Recorded Investment 2,038   2,038   552
With related allowance recorded, Unpaid Principal Balance 4,128   4,128   3,975
With related allowance recorded, Recorded Investment 3,880   3,880   3,704
With an allowance recorded, Allowance for Credit Losses Allocated 935   935   875
With no related allowance recorded, Average Recorded Investment 1,019   864    
With no related allowance recorded, Interest Income Recognized 35   36    
With an allowance recorded, Average Recorded Investment 3,674 4,477 3,683 4,542  
With an allowance recorded, Interest Income Recognized 3 4 3 4  
Agricultural Real Estate [Member]          
Financing Receivable Impaired [Line Items]          
With no related allowance recorded, Unpaid Principal Balance 2,483   2,483   297
With no related allowance recorded, Recorded Investment 2,090   2,090    
With related allowance recorded, Unpaid Principal Balance 1,437   1,437   1,694
With related allowance recorded, Recorded Investment 1,257   1,257   1,167
With an allowance recorded, Allowance for Credit Losses Allocated 297   297   262
With no related allowance recorded, Average Recorded Investment 2,090 1,892 1,393 1,932  
With no related allowance recorded, Interest Income Recognized   16   48  
With an allowance recorded, Average Recorded Investment 1,460 1,296 1,363 2,110  
With an allowance recorded, Interest Income Recognized   0      
Agricultural [Member]          
Financing Receivable Impaired [Line Items]          
With no related allowance recorded, Unpaid Principal Balance 2,604   2,604   1,624
With no related allowance recorded, Recorded Investment 2,236   2,236   1,291
With related allowance recorded, Unpaid Principal Balance 446   446   897
With related allowance recorded, Recorded Investment 425   425   862
With an allowance recorded, Allowance for Credit Losses Allocated 106   106   124
With no related allowance recorded, Average Recorded Investment 2,663 645 2,205 430  
With no related allowance recorded, Interest Income Recognized 3   3    
With an allowance recorded, Average Recorded Investment 346 1,353 518 1,099  
With an allowance recorded, Interest Income Recognized 1 0 1    
Consumer [Member]          
Financing Receivable Impaired [Line Items]          
With no related allowance recorded, Unpaid Principal Balance 19   19   14
With related allowance recorded, Unpaid Principal Balance 753   753   719
With related allowance recorded, Recorded Investment 710   710   681
With an allowance recorded, Allowance for Credit Losses Allocated 174   174   $ 162
With an allowance recorded, Average Recorded Investment 724 802 710 795  
With an allowance recorded, Interest Income Recognized $ 2 $ 6 $ 2 $ 7