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Allowance for Credit Losses (ACL) - Disaggregated analysis of the changes in allowance for credit losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Allowance for credit losses      
Balance at beginning of period $ 456,573 $ 356,444 $ 356,444
Charge-offs (7,940) (4,627) (40,648)
Recoveries 5,261 3,589  
Net (charge-offs) recoveries (2,679) (1,038)  
Provision (recovery) 15,760 15,239  
Balance at end of period 469,654 370,645 456,573
Unfunded Commitment      
Allowance for credit losses      
Provision (recovery) (3,100) 17,900  
Residential Mortgage Sr.      
Allowance for credit losses      
Balance at beginning of period 78,052 72,188 72,188
Charge-offs (343) (2)  
Recoveries 123 294  
Net (charge-offs) recoveries (220) 292  
Provision (recovery) 9,652 4,871  
Balance at end of period 87,484 77,351 78,052
Residential Mortgage Jr.      
Allowance for credit losses      
Balance at beginning of period 745 405 405
Recoveries 39 5  
Net (charge-offs) recoveries 39 5  
Provision (recovery) 446 (61)  
Balance at end of period 1,230 349 745
HELOC      
Allowance for credit losses      
Balance at beginning of period 10,942 14,886 14,886
Charge-offs (110) (39)  
Recoveries 292 245  
Net (charge-offs) recoveries 182 206  
Provision (recovery) 600 (774)  
Balance at end of period 11,724 14,318 10,942
Residential Construction      
Allowance for credit losses      
Balance at beginning of period 5,024 8,974 8,974
Charge-offs (304)    
Recoveries 7 72  
Net (charge-offs) recoveries (297) 72  
Provision (recovery) (175) 130  
Balance at end of period 4,552 9,176 5,024
Commercial Construction and Development      
Allowance for credit losses      
Balance at beginning of period 65,772 45,410 45,410
Charge-offs (1,475)    
Recoveries 1,007 258  
Net (charge-offs) recoveries (468) 258  
Provision (recovery) (4,444) 9,401  
Balance at end of period 60,860 55,069 65,772
Consumer      
Allowance for credit losses      
Balance at beginning of period 23,331 22,767 22,767
Charge-offs (2,497) (2,729)  
Recoveries 1,125 584  
Net (charge-offs) recoveries (1,372) (2,145)  
Provision (recovery) 1,394 2,697  
Balance at end of period 23,353 23,319 23,331
Multifamily      
Allowance for credit losses      
Balance at beginning of period 13,766 3,684 3,684
Recoveries 25    
Net (charge-offs) recoveries 25    
Provision (recovery) 3,221 1,823  
Balance at end of period 17,012 5,507 13,766
Municipal      
Allowance for credit losses      
Balance at beginning of period 900 849 849
Provision (recovery) (24) 30  
Balance at end of period 876 879 900
CRE Owner Occupied      
Allowance for credit losses      
Balance at beginning of period 71,580 58,083 58,083
Recoveries 103 293  
Net (charge-offs) recoveries 103 293  
Provision (recovery) 914 (835)  
Balance at end of period 72,597 57,541 71,580
Non Owner Occupied CRE      
Allowance for credit losses      
Balance at beginning of period 137,055 78,485 78,485
Charge-offs (71) (51)  
Recoveries 10 106  
Net (charge-offs) recoveries (61) 55  
Provision (recovery) (2,296) 3,933  
Balance at end of period 134,698 82,473 137,055
C & I      
Allowance for credit losses      
Balance at beginning of period 49,406 50,713 50,713
Charge-offs (3,140) (1,806)  
Recoveries 2,530 1,732  
Net (charge-offs) recoveries (610) (74)  
Provision (recovery) 6,472 (5,976)  
Balance at end of period $ 55,268 $ 44,663 $ 49,406