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Allowance for Credit Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance $ 108,407 $ 96,049 $ 105,680 $ 85,376 $ 85,376
ACL on PCD Loans   0      
Charge-offs (276) (401) (2,034) (1,144) (1,585)
Recoveries 218 356 388 1,530 1,907
Provision (benefit) 8,980 1,940 13,295 10,145 17,945
Ending  Balance 117,329 97,944 117,329 97,944 105,680
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning Balance 4,195 3,915 4,315 3,790 3,790
ACL on PCD Loans        
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) 670 160 550 285 525
Ending  Balance 4,865 4,075 4,865 4,075 4,315
Credit Loss [Roll Forward]          
Beginning Balance 112,602 99,964 109,995 89,166 89,166
ACL on PCD Loans   0      
Charge-offs (276) (401) (2,034) (1,144) (1,585)
Recoveries 218 356 388 1,530 1,907
Provision (benefit) 9,650 2,100 13,845 10,430 18,470
Ending  Balance 122,194 102,019 122,194 102,019 109,995
ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       2,037 2,037
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]          
Beginning Balance       0 0
Credit Loss [Roll Forward]          
Beginning Balance       2,037 2,037
Commercial Real Estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 64,937 54,992 61,381 51,140 51,140
ACL on PCD Loans   0      
Charge-offs 0 0 0 (294) (294)
Recoveries 1 1 1 1 3
Provision (benefit) 6,078 457 9,634 3,030 8,959
Ending  Balance 71,016 55,450 71,016 55,450 61,381
Commercial Real Estate | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       1,573 1,573
Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 24,896 23,679 24,639 23,474 23,474
ACL on PCD Loans   0      
Charge-offs (163) (166) (347) (285) (594)
Recoveries 63 230 179 516 743
Provision (benefit) 1,717 188 2,042 82 872
Ending  Balance 26,513 23,931 26,513 23,931 24,639
Consumer | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       144 144
Commercial and industrial          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 12,069 9,042 13,597 3,862 3,862
ACL on PCD Loans        
Charge-offs (113) (235) (1,687) (565) (697)
Recoveries 123 124 176 1,011 1,157
Provision (benefit) (432) 1,048 (439) 5,590 9,194
Ending  Balance 11,647 9,979 11,647 9,979 13,597
Commercial and industrial | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       81 81
Construction          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 5,655 7,437 5,142 5,667 5,667
ACL on PCD Loans        
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) 1,376 85 1,889 1,654 (726)
Ending  Balance 7,031 7,522 7,031 7,522 5,142
Construction | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       201 201
Agriculture production          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 833 883 906 1,215 1,215
ACL on PCD Loans        
Charge-offs 0 0 0 0 0
Recoveries 31 1 32 2 4
Provision (benefit) 241 162 167 (209) (351)
Ending  Balance 1,105 1,046 1,105 1,046 906
Agriculture production | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       38 38
Leases          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 17 16 15 18 18
ACL on PCD Loans        
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) 0 0 2 (2) (3)
Ending  Balance 17 16 17 16 15
Leases | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       0 0
CRE non-owner occupied | Commercial Real Estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 32,963 28,055 30,962 25,739 25,739
ACL on PCD Loans        
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 1
Provision (benefit) 79 26 2,080 1,596 4,476
Ending  Balance 33,042 28,081 33,042 28,081 30,962
CRE non-owner occupied | Commercial Real Estate | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       746 746
CRE owner occupied | Commercial Real Estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 14,559 12,071 14,014 10,691 10,691
ACL on PCD Loans        
Charge-offs 0 0 0 0 0
Recoveries 1 1 1 1 2
Provision (benefit) 5,648 548 6,193 1,865 3,258
Ending  Balance 20,208 12,620 20,208 12,620 14,014
CRE owner occupied | Commercial Real Estate | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       63 63
Multifamily | Commercial Real Estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 13,873 11,987 13,132 12,395 12,395
ACL on PCD Loans        
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision (benefit) 202 (192) 943 (600) 737
Ending  Balance 14,075 11,795 14,075 11,795 13,132
Multifamily | Commercial Real Estate | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       0 0
Farmland | Commercial Real Estate          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 3,542 2,879 3,273 2,315 2,315
ACL on PCD Loans        
Charge-offs 0 0 0 (294) (294)
Recoveries 0 0 0 0 0
Provision (benefit) 149 75 418 169 488
Ending  Balance 3,691 2,954 3,691 2,954 3,273
Farmland | Commercial Real Estate | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       764 764
SFR 1-4 1st DT liens | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 11,920 10,669 11,268 10,723 10,723
ACL on PCD Loans        
Charge-offs 0 0 0 0 0
Recoveries 0 1 0 41 79
Provision (benefit) 1,214 (359) 1,866 (597) 322
Ending  Balance 13,134 10,311 13,134 10,311 11,268
SFR 1-4 1st DT liens | Consumer | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       144 144
SFR HELOCs and junior liens | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 10,914 10,843 11,413 10,510 10,510
ACL on PCD Loans        
Charge-offs 0 0 (42) 0 (22)
Recoveries 37 153 102 328 429
Provision (benefit) (343) 595 (865) 753 496
Ending  Balance 10,608 11,591 10,608 11,591 11,413
SFR HELOCs and junior liens | Consumer | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       0 0
Other | Consumer          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance 2,062 2,167 1,958 2,241 2,241
ACL on PCD Loans        
Charge-offs (163) (166) (305) (285) (572)
Recoveries 26 76 77 147 235
Provision (benefit) 846 (48) 1,041 (74) 54
Ending  Balance $ 2,771 $ 2,029 $ 2,771 2,029 1,958
Other | Consumer | ACL of PCD Loans          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning Balance       $ 0 $ 0