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Allowance for Credit Losses (Allowance for Credit Losses Methodology) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 28, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Allowance for credit losses on loans and leases          
Balance, beginning of period   $ 418,671 $ 404,603 $ 440,871 $ 301,135
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date         26,492
Provision for credit losses for loans and leases (1) $ 88,400 30,498 35,082 82,734 156,796
Charge-offs   (34,976) (28,719) (120,930) (82,466)
Recoveries   5,861 5,594 17,379 14,603
Net recoveries (charge-offs)   (29,115) (23,125) (103,551) (67,863)
Balance, end of period   420,054 416,560 420,054 416,560
Reserve for unfunded commitments          
Balance, beginning of period   19,928 19,827 23,208 14,221
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period         5,767
Provision (recapture) for credit losses on unfunded commitments   (1,729) 1,655 (5,009) 1,494
Balance, end of period   18,199 21,482 18,199 21,482
Total allowance for credit losses   438,253 438,042 438,253 438,042
Commercial real estate          
Allowance for credit losses on loans and leases          
Balance, beginning of period   143,146 118,954 125,888 77,813
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date         8,736
Provision for credit losses for loans and leases (1)   15,026 2,734 32,121 35,046
Charge-offs   0 0 (746) (174)
Recoveries   44 31 953 298
Net recoveries (charge-offs)   44 31 207 124
Balance, end of period   158,216 121,719 158,216 121,719
Reserve for unfunded commitments          
Balance, beginning of period   9,946 10,000 11,170 7,207
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period         2,257
Provision (recapture) for credit losses on unfunded commitments   (2,188) (11) (3,412) 525
Balance, end of period   7,758 9,989 7,758 9,989
Total allowance for credit losses   165,974 131,708 165,974 131,708
Commercial          
Allowance for credit losses on loans and leases          
Balance, beginning of period   219,714 211,651 244,821 167,135
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date         17,204
Provision for credit losses for loans and leases (1)   16,710 35,952 63,466 106,979
Charge-offs   (32,645) (26,629) (113,438) (77,913)
Recoveries   5,258 4,901 14,188 12,470
Net recoveries (charge-offs)   (27,387) (21,728) (99,250) (65,443)
Balance, end of period   209,037 225,875 209,037 225,875
Reserve for unfunded commitments          
Balance, beginning of period   6,547 5,821 7,841 3,049
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period         3,066
Provision (recapture) for credit losses on unfunded commitments   509 1,579 (785) 1,285
Balance, end of period   7,056 7,400 7,056 7,400
Total allowance for credit losses   216,093 233,275 216,093 233,275
Residential          
Allowance for credit losses on loans and leases          
Balance, beginning of period   48,885 65,941 62,004 50,329
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date         454
Provision for credit losses for loans and leases (1)   (2,520) (4,619) (15,226) 10,605
Charge-offs   (936) (206) (1,930) (458)
Recoveries   143 156 724 342
Net recoveries (charge-offs)   (793) (50) (1,206) (116)
Balance, end of period   45,572 61,272 45,572 61,272
Reserve for unfunded commitments          
Balance, beginning of period   2,278 3,018 2,940 3,196
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period         268
Provision (recapture) for credit losses on unfunded commitments   (156) 67 (818) (379)
Balance, end of period   2,122 3,085 2,122 3,085
Total allowance for credit losses   47,694 64,357 47,694 64,357
Consumer Portfolio Segment [Member]          
Allowance for credit losses on loans and leases          
Balance, beginning of period   6,926 8,057 8,158 5,858
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date         98
Provision for credit losses for loans and leases (1)   1,282 1,015 2,373 4,166
Charge-offs   (1,395) (1,884) (4,816) (3,921)
Recoveries   416 506 1,514 1,493
Net recoveries (charge-offs)   (979) (1,378) (3,302) (2,428)
Balance, end of period   7,229 7,694 7,229 7,694
Reserve for unfunded commitments          
Balance, beginning of period   1,157 988 1,257 769
Off-Balance-Sheet, Credit Loss, Liability, acquired during the period         176
Provision (recapture) for credit losses on unfunded commitments   106 20 6 63
Balance, end of period   1,263 1,008 1,263 1,008
Total allowance for credit losses   $ 8,492 $ 8,702 $ 8,492 $ 8,702