v3.26.3
Allowance for Credit Losses (ACL) - Disaggregated analysis of the changes in allowance for credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Allowance for credit losses            
Balance at beginning of period $ 586,664 $ 621,046 $ 465,280 $ 585,197 $ 465,280 $ 465,280
Allowance Adjustment - FMV for Independent merger         135,441  
Independent Day 1 Loan Net Charge-offs PCD         (56,688)  
Charge-offs       (43,901) (56,949)  
Charge-offs (17,725) (37,562)   (43,901)   (127,987)
Recoveries 5,408 5,408   13,230 13,108  
Net (charge-offs) recoveries (12,317) (32,154)   (30,671) (100,529)  
Provision (recovery) 14,571 1,241   34,392 9,970  
Balance at end of period 588,918 590,133   588,918 590,133 585,197
Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     79,971   79,971 79,971
Unfunded Commitment            
Allowance for credit losses            
Provision (recovery) of credit losses 5,800 3,800   12,700 23,200  
Unfunded Commitment | Independent            
Allowance for credit losses            
Provision (recovery) of credit losses     12,100      
Residential Mortgage Sr.            
Allowance for credit losses            
Balance at beginning of period 65,629 54,204 42,687 55,947 42,687 42,687
Allowance Adjustment - FMV for Independent merger         1,852  
Independent Day 1 Loan Net Charge-offs PCD         (61)  
Charge-offs       (4,113) (1,590)  
Charge-offs (1,472) (698)        
Recoveries 186 122   314 516  
Net (charge-offs) recoveries (1,286) (576)   (3,799) (1,135)  
Provision (recovery) 72 108   12,267 1,422  
Balance at end of period 64,415 53,736   64,415 53,736 55,947
Residential Mortgage Sr. | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     8,910   8,910 8,910
Residential Mortgage Jr.            
Allowance for credit losses            
Balance at beginning of period 1,133 868 432 1,356 432 432
Charge-offs         (14)  
Charge-offs   0        
Recoveries 55 190   152 279  
Net (charge-offs) recoveries 55 190   152 265  
Provision (recovery) 95 (54)   (225) 222  
Balance at end of period 1,283 1,004   1,283 1,004 1,356
Residential Mortgage Jr. | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     85   85 85
HELOC            
Allowance for credit losses            
Balance at beginning of period 14,085 13,884 14,845 14,150 14,845 14,845
Charge-offs       (268) (295)  
Charge-offs (69) (66)        
Recoveries 156 110   585 615  
Net (charge-offs) recoveries 87 44   317 320  
Provision (recovery) 652 872   357 (456)  
Balance at end of period 14,824 14,800   14,824 14,800 14,150
HELOC | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     91   91 91
Residential Construction            
Allowance for credit losses            
Balance at beginning of period 9,353 7,150 9,298 8,732 9,298 9,298
Provision (recovery) (349) 2,190   272 (4,658)  
Balance at end of period 9,004 9,340   9,004 9,340 8,732
Residential Construction | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     4,700   4,700 4,700
Commercial Construction and Development            
Allowance for credit losses            
Balance at beginning of period 55,076 76,297 65,553 53,494 65,553 65,553
Allowance Adjustment - FMV for Independent merger         6,448  
Charge-offs       (222) (16)  
Charge-offs (56) 0        
Recoveries 35 108   403 521  
Net (charge-offs) recoveries (21) 108   181 505  
Provision (recovery) (4,947) (18,512)   (3,567) (26,364)  
Balance at end of period 50,108 57,893   50,108 57,893 53,494
Commercial Construction and Development | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     11,751   11,751 11,751
Consumer            
Allowance for credit losses            
Balance at beginning of period 16,616 18,685 17,484 19,280 17,484 17,484
Allowance Adjustment - FMV for Independent merger         114  
Independent Day 1 Loan Net Charge-offs PCD         (2,323)  
Charge-offs       (6,768) (6,958)  
Charge-offs (2,464) (2,969)        
Recoveries 350 764   2,065 2,123  
Net (charge-offs) recoveries (2,114) (2,205)   (4,703) (7,158)  
Provision (recovery) 889 2,201   814 7,987  
Balance at end of period 15,391 18,681   15,391 18,681 19,280
Consumer | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     254   254 254
Multifamily            
Allowance for credit losses            
Balance at beginning of period 59,324 51,088 22,279 58,678 22,279 22,279
Allowance Adjustment - FMV for Independent merger         20,359  
Independent Day 1 Loan Net Charge-offs PCD         (18,065)  
Recoveries 848     1,010    
Net (charge-offs) recoveries 848 0   1,010 (18,065)  
Provision (recovery) (513) 13,825   (29) 36,535  
Balance at end of period 59,659 64,913   59,659 64,913 58,678
Multifamily | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     3,805   3,805 3,805
Municipal            
Allowance for credit losses            
Balance at beginning of period 1,819 2,279 1,197 1,799 1,197 1,197
Provision (recovery) 21 (168)   41 (1,033)  
Balance at end of period 1,840 2,111   1,840 2,111 1,799
Municipal | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     1,947   1,947 1,947
CRE Owner Occupied            
Allowance for credit losses            
Balance at beginning of period 72,196 88,223 78,753 73,871 78,753 78,753
Allowance Adjustment - FMV for Independent merger         8,075  
Independent Day 1 Loan Net Charge-offs PCD         (1,016)  
Charge-offs       (698) (1,631)  
Charge-offs (327) (655)        
Recoveries 1,907 50   2,162 167  
Net (charge-offs) recoveries 1,580 (605)   1,464 (2,480)  
Provision (recovery) (3,898) (14,023)   (5,457) (13,939)  
Balance at end of period 69,878 73,595   69,878 73,595 73,871
CRE Owner Occupied | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     3,186   3,186 3,186
Non Owner Occupied CRE            
Allowance for credit losses            
Balance at beginning of period 178,804 165,193 111,538 174,797 111,538 111,538
Allowance Adjustment - FMV for Independent merger         93,820  
Independent Day 1 Loan Net Charge-offs PCD         (13,036)  
Charge-offs       (6,291)    
Charge-offs (5,322) 0        
Recoveries 242 2,048   298 2,391  
Net (charge-offs) recoveries (5,080) 2,048   (5,993) (10,645)  
Provision (recovery) 11,317 10,022   16,237 (49,007)  
Balance at end of period 185,041 177,263   185,041 177,263 174,797
Non Owner Occupied CRE | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     31,557   31,557 31,557
C & I            
Allowance for credit losses            
Balance at beginning of period 112,629 143,175 101,214 123,093 101,214 101,214
Allowance Adjustment - FMV for Independent merger         4,773  
Independent Day 1 Loan Net Charge-offs PCD         (22,187)  
Charge-offs       (25,541) (46,445)  
Charge-offs (8,015) (33,174)        
Recoveries 1,629 2,016   6,241 6,496  
Net (charge-offs) recoveries (6,386) (31,158)   (19,300) (62,136)  
Provision (recovery) 11,232 4,780   13,682 59,261  
Balance at end of period $ 117,475 $ 116,797   $ 117,475 116,797 123,093
C & I | Initial Allowance for Non PCD loans acquired during period            
Allowance for credit losses            
Balance at beginning of period     $ 13,685   $ 13,685 $ 13,685