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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

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