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Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 125,366 $ 121,522 $ 121,522
Charge-offs (374) (1,275) (4,051)
Recoveries 768 132 1,413
Provision (benefit) 2,663 4,015 6,482
Ending  balance 128,423 124,394 125,366
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]      
Beginning balance 6,000 5,850 5,850
Charge-offs 0 0 0
Recoveries 0 0 0
Provision for (benefit from) credit losses 1,065 290 150
Ending balance 7,065 6,140 6,000
Credit Loss [Roll Forward]      
Beginning balance 131,366 127,372 127,372
Charge-offs (374) (1,275) (4,051)
Recoveries 768 132 1,413
Provision for (benefit from) credit losses 3,728 4,305 6,632
Ending balance 135,488 130,534 131,366
Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 72,849 68,864 68,864
Charge-offs 0 0 0
Recoveries 0 0 189
Provision (benefit) (669) 3,311 3,796
Ending  balance 72,180 72,175 72,849
Consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 27,463 27,453 27,453
Charge-offs (117) (308) (814)
Recoveries 49 89 612
Provision (benefit) (1,855) 207 212
Ending  balance 25,540 27,441 27,463
Commercial and industrial      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 14,397 12,750 12,750
Charge-offs (257) (130) (1,787)
Recoveries 106 22 547
Provision (benefit) 3,315 (775) 2,887
Ending  balance 17,561 11,867 14,397
Construction      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 7,224 8,856 8,856
Charge-offs 0 0 0
Recoveries 0 0 0
Provision (benefit) 3,122 306 (1,632)
Ending  balance 10,346 9,162 7,224
Agriculture production      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 3,403 3,589 3,589
Charge-offs 0 (837) (1,450)
Recoveries 613 21 65
Provision (benefit) (1,248) 935 1,199
Ending  balance 2,768 3,708 3,403
Leases      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 30 10 10
Charge-offs 0 0 0
Recoveries 0 0 0
Provision (benefit) (2) 31 20
Ending  balance 28 41 30
CRE non-owner occupied | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 37,229 35,077 35,077
Charge-offs 0 0 0
Recoveries 0 0 187
Provision (benefit) 2,441 1,610 1,965
Ending  balance 39,670 36,687 37,229
CRE owner occupied | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 15,747 15,081 15,081
Charge-offs 0 0 0
Recoveries 0 0 2
Provision (benefit) (3,578) 1,030 664
Ending  balance 12,169 16,111 15,747
Multifamily | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 15,913 14,418 14,418
Charge-offs 0 0 0
Recoveries 0 0 0
Provision (benefit) (309) 1,264 1,495
Ending  balance 15,604 15,682 15,913
Farmland | Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 3,960 4,288 4,288
Charge-offs 0 0 0
Recoveries 0 0 0
Provision (benefit) 777 (593) (328)
Ending  balance 4,737 3,695 3,960
SFR 1-4 1st DT liens | Consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 14,227 14,009 14,009
Charge-offs 0 (26) (27)
Recoveries 0 0 0
Provision (benefit) (3,232) 157 245
Ending  balance 10,995 14,140 14,227
SFR HELOCs and junior liens | Consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 10,411 10,273 10,273
Charge-offs 0 (32) (41)
Recoveries 12 49 395
Provision (benefit) 1,227 (348) (216)
Ending  balance 11,650 9,942 10,411
Other | Consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 2,825 3,171 3,171
Charge-offs (117) (250) (746)
Recoveries 37 40 217
Provision (benefit) 150 398 183
Ending  balance $ 2,895 $ 3,359 $ 2,825