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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Balance, beginning of period | $ 114,400 |  |
Charge-offs | (6,680) |  | $ (26,778)
Recoveries | 2,001 |  |
Provision | 5,579 | $ 3,909 |
Balance, end of period | 115,300 |  | 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
Charge-offs |  | (5,850) |
Recoveries |  | 2,039 |
Provision |  | 3,909 |
Balance, end of period |  | 100,250 |
Commercial Loans [Member] |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Balance, beginning of period | 45,903 |  |
Charge-offs | (985) |  |
Recoveries | 198 |  |
Provision | (644) |  |
Balance, end of period | 44,472 |  | 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
Charge-offs |  | (169) |
Recoveries |  | 541 |
Provision |  | 1,006 |
Balance, end of period |  | 36,040 |
Consumer Loans [Member] |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Balance, beginning of period | 46,427 |  |
Charge-offs | (5,581) |  |
Recoveries | 1,651 |  |
Provision | 4,922 |  |
Balance, end of period | 47,419 |  | 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
Charge-offs |  | (5,342) |
Recoveries |  | 1,377 |
Provision |  | 1,834 |
Balance, end of period |  | 48,820 |
Residential [Member] |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |
Balance, beginning of period | 22,070 |  |
Charge-offs | (114) |  | (517)
Recoveries | 152 |  |
Provision | 1,301 |  |
Balance, end of period | $ 23,409 |  | 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
Charge-offs |  | (339) |
Recoveries |  | 121 |
Provision |  | 1,069 |
Balance, end of period |  | $ 15,390 |

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