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Allowance for Credit Losses and Credit Quality of Loans, Allowance for Credit Losses by Portfolio Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period | $ 120,500 | $ 100,400 | $ 114,400 |  |
Allowance for credit loss on PCD acquired loans |  | 5,772 |  |  |
Charge-offs | (6,077) | (6,321) | (18,384) |  | $ (26,778)
Recoveries | 2,157 | 2,117 | 6,086 |  |
Provision | 2,920 | 12,633 | 17,398 | $ 20,148 |
Balance, end of period | 119,500 | 114,601 | 119,500 | 114,601 | 114,400
ASU 2022-02 [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period |  |  |  | 100,152 | 100,152
Allowance for credit loss on PCD acquired loans |  |  |  | 5,772 |
Charge-offs |  |  |  | (17,320) |
Recoveries |  |  |  | 5,849 |
Provision |  |  |  | 20,148 |
Balance, end of period |  | 114,601 |  | 114,601 |
Commercial Loans [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period | 46,708 | 36,963 | 45,903 |  |
Allowance for credit loss on PCD acquired loans |  | 5,300 |  |  |
Charge-offs | (1,117) | (138) | (2,401) |  |
Recoveries | 275 | 474 | 765 |  |
Provision | 1,372 | 4,121 | 2,971 |  |
Balance, end of period | 47,238 | 46,720 | 47,238 | 46,720 | 45,903
Commercial Loans [Member] | ASU 2022-02 [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period |  |  |  | 34,662 | 34,662
Allowance for credit loss on PCD acquired loans |  |  |  | 5,300 |
Charge-offs |  |  |  | (514) |
Recoveries |  |  |  | 1,112 |
Provision |  |  |  | 6,160 |
Balance, end of period |  | 46,720 |  | 46,720 |
Consumer Loans [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period | 47,918 | 47,883 | 46,427 |  |
Allowance for credit loss on PCD acquired loans |  | 19 |  |  |
Charge-offs | (4,926) | (6,167) | (15,835) |  |
Recoveries | 1,789 | 1,549 | 4,999 |  |
Provision | 835 | 3,990 | 10,025 |  |
Balance, end of period | 45,616 | 47,274 | 45,616 | 47,274 | 46,427
Consumer Loans [Member] | ASU 2022-02 [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period |  |  |  | 50,951 | 50,951
Allowance for credit loss on PCD acquired loans |  |  |  | 19 |
Charge-offs |  |  |  | (16,346) |
Recoveries |  |  |  | 4,367 |
Provision |  |  |  | 8,283 |
Balance, end of period |  | 47,274 |  | 47,274 |
Residential [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period | 25,874 | 15,554 | 22,070 |  |
Allowance for credit loss on PCD acquired loans |  | 453 |  |  |
Charge-offs | (34) | (16) | (148) |  | (517)
Recoveries | 93 | 94 | 322 |  |
Provision | 713 | 4,522 | 4,402 |  |
Balance, end of period | $ 26,646 | 20,607 | $ 26,646 | 20,607 | 22,070
Residential [Member] | ASU 2022-02 [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period |  |  |  | 14,539 | $ 14,539
Allowance for credit loss on PCD acquired loans |  |  |  | 453 |
Charge-offs |  |  |  | (460) |
Recoveries |  |  |  | 370 |
Provision |  |  |  | 5,705 |
Balance, end of period |  | $ 20,607 |  | $ 20,607 |

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- Definition Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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