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Allowance for Credit Losses (Allowance for Credit Losses Methodology) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 28, 2023
Dec. 31, 2024
Dec. 31, 2023
Allowance for credit losses on loans and leases      
Balance, beginning of period   $ 440,871 $ 301,135
Initial ACL on PCD loans acquired during the period     26,492
Provision for credit losses for loans and leases (1) $ 88,400 112,964 209,979
Charge-offs   (151,194) (116,974)
Recoveries   21,988 20,239
Net recoveries (charge-offs)   (129,206) (96,735)
Balance, end of period   424,629 440,871
Reserve for unfunded commitments      
Balance, beginning of period   23,208 14,221
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period     5,767
Provision (recapture) for credit losses on unfunded commitments   (7,040) 3,220
Balance, end of period   16,168 23,208
Total allowance for credit losses   440,797 464,079
Commercial real estate      
Allowance for credit losses on loans and leases      
Balance, beginning of period   125,888 77,813
Initial ACL on PCD loans acquired during the period     8,736
Provision for credit losses for loans and leases (1)   31,250 39,809
Charge-offs   (3,681) (803)
Recoveries   956 333
Net recoveries (charge-offs)   (2,725) (470)
Balance, end of period   154,413 125,888
Reserve for unfunded commitments      
Balance, beginning of period   11,170 7,207
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period     2,257
Provision (recapture) for credit losses on unfunded commitments   (5,238) 1,706
Balance, end of period   5,932 11,170
Total allowance for credit losses   160,345 137,058
Commercial      
Allowance for credit losses on loans and leases      
Balance, beginning of period   244,821 167,135
Initial ACL on PCD loans acquired during the period     17,204
Provision for credit losses for loans and leases (1)   94,773 153,460
Charge-offs   (139,218) (109,862)
Recoveries   18,292 16,884
Net recoveries (charge-offs)   (120,926) (92,978)
Balance, end of period   218,668 244,821
Reserve for unfunded commitments      
Balance, beginning of period   7,841 3,049
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period     3,066
Provision (recapture) for credit losses on unfunded commitments   (906) 1,726
Balance, end of period   6,935 7,841
Total allowance for credit losses   225,603 252,662
Residential      
Allowance for credit losses on loans and leases      
Balance, beginning of period   62,004 50,329
Initial ACL on PCD loans acquired during the period     454
Provision for credit losses for loans and leases (1)   (16,235) 10,645
Charge-offs   (1,956) (547)
Recoveries   887 1,123
Net recoveries (charge-offs)   (1,069) 576
Balance, end of period   44,700 62,004
Reserve for unfunded commitments      
Balance, beginning of period   2,940 3,196
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period     268
Provision (recapture) for credit losses on unfunded commitments   (856) (524)
Balance, end of period   2,084 2,940
Total allowance for credit losses   46,784 64,944
Consumer & other, net      
Allowance for credit losses on loans and leases      
Balance, beginning of period   8,158 5,858
Initial ACL on PCD loans acquired during the period     98
Provision for credit losses for loans and leases (1)   3,176 6,065
Charge-offs   (6,339) (5,762)
Recoveries   1,853 1,899
Net recoveries (charge-offs)   (4,486) (3,863)
Balance, end of period   6,848 8,158
Reserve for unfunded commitments      
Balance, beginning of period   1,257 769
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period     176
Provision (recapture) for credit losses on unfunded commitments   (40) 312
Balance, end of period   1,217 1,257
Total allowance for credit losses   $ 8,065 $ 9,415