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Allowance for Credit Losses (ACL) - Disaggregated analysis of the changes in allowance for credit losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for credit losses      
Balance at beginning of period $ 356,444 $ 301,807 $ 457,309
Charge-offs (40,648) (23,446) (16,899)
Recoveries 15,782 19,173 13,800
Net (charge-offs) recoveries (24,866) (4,273) (3,099)
Provision (benefit) 124,995 31,455 (152,403)
Balance at end of period 456,573 356,444 301,807
Unfunded Commitment      
Allowance for credit losses      
Provision (recovery) 10,900 (36,700) 12,900
Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 13,758    
Balance at end of period   13,758  
Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 13,697    
Balance at end of period   13,697  
Residential Mortgage Sr.      
Allowance for credit losses      
Balance at beginning of period 72,188 47,036 63,561
Charge-offs (187) (197) (204)
Recoveries 922 1,233 1,547
Net (charge-offs) recoveries 735 1,036 1,343
Provision (benefit) 5,129 22,953 (17,868)
Balance at end of period 78,052 72,188 47,036
Residential Mortgage Sr. | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 811    
Balance at end of period   811  
Residential Mortgage Sr. | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 352    
Balance at end of period   352  
Residential Mortgage Jr.      
Allowance for credit losses      
Balance at beginning of period 405 611 1,238
Charge-offs   (19)  
Recoveries 108 231 146
Net (charge-offs) recoveries 108 212 146
Provision (benefit) 232 (444) (773)
Balance at end of period 745 405 611
Residential Mortgage Jr. | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 26    
Balance at end of period   26  
HELOC      
Allowance for credit losses      
Balance at beginning of period 14,886 13,325 16,698
Charge-offs (177) (445) (1,002)
Recoveries 1,250 3,981 2,256
Net (charge-offs) recoveries 1,073 3,536 1,254
Provision (benefit) (5,017) (2,107) (4,627)
Balance at end of period 10,942 14,886 13,325
HELOC | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 132    
Balance at end of period   132  
Residential Construction      
Allowance for credit losses      
Balance at beginning of period 8,974 4,997 4,914
Charge-offs   (21) (29)
Recoveries 128 8 60
Net (charge-offs) recoveries 128 (13) 31
Provision (benefit) (4,078) 3,988 52
Balance at end of period 5,024 8,974 4,997
Residential Construction | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 2    
Balance at end of period   2  
Commercial Construction and Development      
Allowance for credit losses      
Balance at beginning of period 45,410 37,593 67,197
Charge-offs (225) (4) (87)
Recoveries 687 1,104 1,861
Net (charge-offs) recoveries 462 1,100 1,774
Provision (benefit) 19,900 4,744 (31,378)
Balance at end of period 65,772 45,410 37,593
Commercial Construction and Development | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 86    
Balance at end of period   86  
Commercial Construction and Development | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 1,887    
Balance at end of period   1,887  
Consumer      
Allowance for credit losses      
Balance at beginning of period 22,767 23,149 26,562
Charge-offs (12,042) (10,214) (8,809)
Recoveries 2,247 2,426 2,075
Net (charge-offs) recoveries (9,795) (7,788) (6,734)
Provision (benefit) 10,359 7,355 3,321
Balance at end of period 23,331 22,767 23,149
Consumer | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 51    
Balance at end of period   51  
Multifamily      
Allowance for credit losses      
Balance at beginning of period 3,684 4,921 7,887
Recoveries 41   3
Net (charge-offs) recoveries 41   3
Provision (benefit) 10,041 (1,663) (2,969)
Balance at end of period 13,766 3,684 4,921
Multifamily | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 426    
Balance at end of period   426  
Municipal      
Allowance for credit losses      
Balance at beginning of period 849 565 1,510
Provision (benefit) 51 284 (945)
Balance at end of period 900 849 565
CRE Owner Occupied      
Allowance for credit losses      
Balance at beginning of period 58,083 61,794 97,104
Charge-offs (126) (1,976) (2,052)
Recoveries 938 1,327 970
Net (charge-offs) recoveries 812 (649) (1,082)
Provision (benefit) 12,685 (7,990) (34,228)
Balance at end of period 71,580 58,083 61,794
CRE Owner Occupied | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 2,409    
Balance at end of period   2,409  
CRE Owner Occupied | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 2,519    
Balance at end of period   2,519  
Non Owner Occupied CRE      
Allowance for credit losses      
Balance at beginning of period 78,485 79,649 124,421
Charge-offs (304) (368) (863)
Recoveries 962 581 1,070
Net (charge-offs) recoveries 658 213 207
Provision (benefit) 57,912 (4,074) (44,979)
Balance at end of period 137,055 78,485 79,649
Non Owner Occupied CRE | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 2,697    
Balance at end of period   2,697  
C & I      
Allowance for credit losses      
Balance at beginning of period 50,713 28,167 46,217
Charge-offs (27,587) (10,202) (3,853)
Recoveries 8,499 8,282 3,812
Net (charge-offs) recoveries (19,088) (1,920) (41)
Provision (benefit) 17,781 8,409 (18,009)
Balance at end of period 49,406 50,713 $ 28,167
C & I | Initial PCD Allowance      
Allowance for credit losses      
Balance at beginning of period 10,452    
Balance at end of period   10,452  
C & I | Initial Non PCD Allowance      
Allowance for credit losses      
Balance at beginning of period $ 5,605    
Balance at end of period   $ 5,605