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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period | $ 140,200 | $ 120,500 | $ 116,000 | $ 114,400 | $ 114,400
Allowance for credit loss on PCD acquired loans |  |  | 7,726 |  |
Charge-offs | (6,396) | (6,077) | (18,982) | (18,384) | (25,728)
Recoveries | 2,096 | 2,157 | 5,767 | 6,086 |
Provision | 3,100 | 2,920 | 28,489 | 17,398 |
Balance, end of period | 139,000 | 119,500 | 139,000 | 119,500 | 116,000
Commercial Loans [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period | 66,021 | 46,708 | 45,453 | 45,903 | 45,903
Allowance for credit loss on PCD acquired loans |  |  | 7,355 |  |
Charge-offs | (655) | (1,117) | (3,410) | (2,401) |
Recoveries | 224 | 275 | 740 | 765 |
Provision | 220 | 1,372 | 15,672 | 2,971 |
Balance, end of period | 65,810 | 47,238 | 65,810 | 47,238 | 45,453
Consumer Loans [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period | 40,869 | 47,918 | 43,987 | 46,427 | 46,427
Allowance for credit loss on PCD acquired loans |  |  | 0 |  |
Charge-offs | (5,020) | (4,926) | (14,733) | (15,835) |
Recoveries | 1,809 | 1,789 | 4,781 | 4,999 |
Provision | 2,135 | 835 | 5,758 | 10,025 |
Balance, end of period | 39,793 | 45,616 | 39,793 | 45,616 | 43,987
Residential [Member] |  |  |  |  |
Activity in allowance for credit losses by portfolio segment [Roll Forward] |  |  |  |  |
Balance, beginning of period | 33,310 | 25,874 | 26,560 | 22,070 | 22,070
Allowance for credit loss on PCD acquired loans |  |  | 371 |  |
Charge-offs | (721) | (34) | (839) | (148) | (211)
Recoveries | 63 | 93 | 246 | 322 |
Provision | 745 | 713 | 7,059 | 4,402 |
Balance, end of period | $ 33,397 | $ 26,646 | $ 33,397 | $ 26,646 | $ 26,560

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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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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (1) -Publisher SEC Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph a -Subparagraph (3) -Publisher SEC Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 + Details
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