v3.26.1
Allowance for Credit Losses - Changes in the Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance $ 40,536 $ 40,284 $ 42,020 $ 39,669 $ 39,669
Charge-offs (174) (1,092) (980) (2,068)  
Recoveries 100 92 190 435  
Provision 1,251 1,171 483 2,419  
Ending Balance 41,713 40,455 41,713 40,455 42,020
Commercial and Agriculture [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance 4,996 6,194 5,153 6,586 6,586
Charge-offs (2) (363) (98) (435)  
Recoveries 34 44 96 335  
Provision 2,296 182 2,173 (429)  
Ending Balance 7,324 6,057 7,324 6,057 5,153
Commercial Real Estate Owner Occupied [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance 4,280 4,466 4,420 4,327 4,327
Recoveries 2   3    
Provision 79 146 (62) 285  
Ending Balance 4,361 4,612 4,361 4,612 4,420
Commercial Real Estate Non Owner Occupied [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance 11,789 11,412 12,118 11,404 11,404
Charge-offs   (550) (484) (1,350)  
Recoveries 1 3 2 3  
Provision (1,125) 456 (971) 1,264  
Ending Balance 10,665 11,321 10,665 11,321 12,118
Residential Real Estate [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance 14,486 12,455 14,718 11,866 11,866
Charge-offs (27) (115) (30) (115)  
Recoveries 21 23 34 42  
Provision (378) 712 (620) 1,282  
Ending Balance 14,102 13,075 14,102 13,075 14,718
Real Estate Construction [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance 3,502 4,017 3,842 3,708 3,708
Provision 338 (322) (2) (13)  
Ending Balance 3,840 3,695 3,840 3,695 3,842
Farm Real Estate [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance 225 264 279 226 226
Provision 1 41 (53) 79  
Ending Balance 226 305 226 305 279
Lease Financing Receivable [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance 1,008 1,277 1,169 1,361 1,361
Charge-offs (138) (62) (348) (152)  
Recoveries 40 17 44 42  
Provision 49 (18) 94 (37)  
Ending Balance 959 1,214 959 1,214 1,169
Consumer and Other [Member]          
Accounts Notes And Loans Receivable [Line Items]          
Beginning Balance 250 199 321 191 191
Charge-offs (7) (2) (20) (16)  
Recoveries 2 5 11 13  
Provision (9) (26) (76) (12)  
Ending Balance $ 236 $ 176 $ 236 $ 176 $ 321