v3.25.4
Loans and Allowance for Credit Losses - Impaired Loans, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance $ 8,486 $ 5,608
With no related allowance recorded, Recorded Investment 6,284 5,082
With no related allowance recorded, Average Recorded Investment 12,932 6,058
With no related allowance recorded, Interest Income Recognized 104 245
With related allowance recorded, Unpaid Principal Balance 39,540 29,796
With related allowance recorded, Recorded Investment 33,992 21,968
With an allowance recorded, Allowance for Credit Losses Allocated 5,365 4,599
With an allowance recorded, Average Recorded Investment 23,617 20,769
With an allowance recorded, Interest Income Recognized 572 347
Unpaid Principal Balance 48,026 35,404
Recorded Investment 40,276 27,050
Average Recorded Investment 36,549 26,827
Interest Income Recognized 676 592
Commercial Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 3,795 3,068
With no related allowance recorded, Recorded Investment 3,734 3,068
With no related allowance recorded, Average Recorded Investment 3,470 3,542
With no related allowance recorded, Interest Income Recognized 66 104
With related allowance recorded, Unpaid Principal Balance 7,461 4,719
With related allowance recorded, Recorded Investment 6,758 4,390
With an allowance recorded, Allowance for Credit Losses Allocated 1,639 1,015
With an allowance recorded, Average Recorded Investment 6,821 3,382
With an allowance recorded, Interest Income Recognized 182 105
Commercial and Industrial [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 2,146 0
With no related allowance recorded, Recorded Investment 707  
With no related allowance recorded, Average Recorded Investment 6,995 398
With no related allowance recorded, Interest Income Recognized 5 0
With related allowance recorded, Unpaid Principal Balance 24,794 12,424
With related allowance recorded, Recorded Investment 20,820 7,798
With an allowance recorded, Allowance for Credit Losses Allocated 2,303 1,482
With an allowance recorded, Average Recorded Investment 9,584 6,760
With an allowance recorded, Interest Income Recognized 289 164
Residential Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 610 19
With no related allowance recorded, Recorded Investment 552  
With no related allowance recorded, Average Recorded Investment 110 0
With no related allowance recorded, Interest Income Recognized 31 1
With related allowance recorded, Unpaid Principal Balance 3,975 5,260
With related allowance recorded, Recorded Investment 3,704 4,670
With an allowance recorded, Allowance for Credit Losses Allocated 875 1,145
With an allowance recorded, Average Recorded Investment 4,103 5,011
With an allowance recorded, Interest Income Recognized 66 40
Agricultural Real Estate [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 297 2,490
With no related allowance recorded, Recorded Investment 0 2,014
With no related allowance recorded, Average Recorded Investment 1,583 2,009
With no related allowance recorded, Interest Income Recognized 2 140
With related allowance recorded, Unpaid Principal Balance 1,694 5,594
With related allowance recorded, Recorded Investment 1,167 3,737
With an allowance recorded, Allowance for Credit Losses Allocated 262 697
With an allowance recorded, Average Recorded Investment 1,747 3,520
With an allowance recorded, Interest Income Recognized 5 10
Consumer [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 14 31
With no related allowance recorded, Interest Income Recognized   0
With related allowance recorded, Unpaid Principal Balance 719 846
With related allowance recorded, Recorded Investment 681 781
With an allowance recorded, Allowance for Credit Losses Allocated 162 187
With an allowance recorded, Average Recorded Investment 753 706
With an allowance recorded, Interest Income Recognized 19 22
Agricultural [Member]    
Financing Receivable Impaired [Line Items]    
With no related allowance recorded, Unpaid Principal Balance 1,624 0
With no related allowance recorded, Recorded Investment 1,291  
With no related allowance recorded, Average Recorded Investment 774 109
With no related allowance recorded, Interest Income Recognized   0
With related allowance recorded, Unpaid Principal Balance 897 953
With related allowance recorded, Recorded Investment 862 592
With an allowance recorded, Allowance for Credit Losses Allocated 124 73
With an allowance recorded, Average Recorded Investment 609 1,390
With an allowance recorded, Interest Income Recognized $ 11 $ 6