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Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 124,455 $ 123,517 $ 125,366 $ 121,522 $ 121,522
Charge-offs (737) (444) (9,706) (3,329) (4,051)
Recoveries 123 367 993 897 1,413
Provision (benefit) 730 320 7,918 4,670 6,482
Ending  balance 124,571 123,760 124,571 123,760 125,366
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning balance 7,205 6,210 6,000 5,850 5,850
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision for (benefit from) credit losses (60) (100) 1,145 260 150
Ending balance 7,145 6,110 7,145 6,110 6,000
Credit Loss [Roll Forward]          
Beginning balance 131,660 129,727 131,366 127,372 127,372
Charge-offs (737) (444) (9,706) (3,329) (4,051)
Recoveries 123 367 993 897 1,413
Provision for (benefit from) credit losses 670 220 9,063 4,930 6,632
Ending balance 131,716 129,870 131,716 129,870 131,366
Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 74,484 73,032 72,849 68,864 68,864
Charge-offs 0 0 0 0 0
Recoveries 0 1 1 2 189
Provision (benefit) 533 (1,694) 2,167 2,473 3,796
Ending  balance 75,017 71,339 75,017 71,339 72,849
Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 25,318 27,674 27,463 27,453 27,453
Charge-offs (142) (170) (459) (605) (814)
Recoveries 34 259 123 480 612
Provision (benefit) 538 (259) (1,379) 176 212
Ending  balance 25,748 27,504 25,748 27,504 27,463
Commercial and industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 10,024 12,128 14,397 12,750 12,750
Charge-offs (595) (274) (9,236) (1,274) (1,787)
Recoveries 89 106 255 389 547
Provision (benefit) (429) 2,493 3,673 2,588 2,887
Ending  balance 9,089 14,453 9,089 14,453 14,397
Construction          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 10,995 7,466 7,224 8,856 8,856
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) (203) (347) 3,568 (1,737) (1,632)
Ending  balance 10,792 7,119 10,792 7,119 7,224
Agriculture production          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 3,609 3,180 3,403 3,589 3,589
Charge-offs 0 0 (11) (1,450) (1,450)
Recoveries 0 1 614 26 65
Provision (benefit) 292 131 (105) 1,147 1,199
Ending  balance 3,901 3,312 3,901 3,312 3,403
Leases          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 25 37 30 10 10
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) (1) (4) (6) 23 20
Ending  balance 24 33 24 33 30
CRE non-owner occupied | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 40,921 37,155 37,229 35,077 35,077
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 187
Provision (benefit) 258 (949) 3,950 1,129 1,965
Ending  balance 41,179 36,206 41,179 36,206 37,229
CRE owner occupied | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 11,578 15,873 15,747 15,081 15,081
Charge-offs 0 0 0 0 0
Recoveries 0 1 1 2 2
Provision (benefit) 352 (492) (3,818) 299 664
Ending  balance 11,930 15,382 11,930 15,382 15,747
Multifamily | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 15,097 15,973 15,913 14,418 14,418
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) 609 (238) (207) 1,317 1,495
Ending  balance 15,706 15,735 15,706 15,735 15,913
Farmland | Commercial real estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 6,888 4,031 3,960 4,288 4,288
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) (686) (15) 2,242 (272) (328)
Ending  balance 6,202 4,016 6,202 4,016 3,960
SFR 1-4 1st DT liens | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 11,135 14,604 14,227 14,009 14,009
Charge-offs 0 0 0 (26) (27)
Recoveries 0 0 0 0 0
Provision (benefit) (113) (238) (3,205) 383 245
Ending  balance 11,022 14,366 11,022 14,366 14,227
SFR HELOCs and junior liens | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 12,021 10,087 10,411 10,273 10,273
Charge-offs 0 0 0 (41) (41)
Recoveries 4 196 20 296 395
Provision (benefit) 337 (98) 1,931 (343) (216)
Ending  balance 12,362 10,185 12,362 10,185 10,411
Other | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,162 2,983 2,825 3,171 3,171
Charge-offs (142) (170) (459) (538) (746)
Recoveries 30 63 103 184 217
Provision (benefit) 314 77 (105) 136 183
Ending  balance $ 2,364 $ 2,953 $ 2,364 $ 2,953 $ 2,825