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Derivative and Hedging Activities, Derivative Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Notional Amount | $ 550,000 | $ 100,000 |
Derivative Liability, Notional Amount | 50,000 | 300,000 |
Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | 48,495 | 79,807 |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 25,348 | 14,369 |
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | 15,132 | 12,667 |
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset | 15,132 | 12,667 |
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset | 12,922 | 35,190 |
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset | 6,960 | 250 |
Derivative Asset | 20,441 | 31,950 |
Derivative Liability | 3,256 | 1,452 |
Other Assets [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | 90,842 | 98,854 |
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | 15,132 | 12,667 |
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash, Offset Against Derivative Asset | 12,922 | 35,190 |
Derivative Asset | 62,788 | 50,997 |
Other Liabilities [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 114,564 | 178,573 |
Derivative Liability, Subject to Master Netting Arrangement, Asset Offset | 15,132 | 12,667 |
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset | 6,960 | 250 |
Derivative Liability | 92,472 | 165,656 |
Designated as Hedging Instrument | Other Assets [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | 12,013 | 5,418 |
Designated as Hedging Instrument | Other Assets [Member] | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Notional Amount | 2,900,000 | 1,950,000 |
Designated as Hedging Instrument | Other Assets [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Notional Amount | 186,363 | 127,518 |
Designated as Hedging Instrument | Other Liabilities [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 912 | 3,539 |
Designated as Hedging Instrument | Other Liabilities [Member] | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability, Notional Amount | 150,000 | 1,150,000 |
Designated as Hedging Instrument | Other Liabilities [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability, Notional Amount | 253,556 | 216,665 |
Not Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Subject to Master Netting Arrangement, before Offset | 78,829 | 93,436 |
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Notional Amount | 5,068,235 | 3,858,867 |
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Notional Amount | 85,329 | 68,028 |
Not Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest Rate Lock Commitments [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Notional Amount | 63,721 | 28,580 |
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability, Subject to Master Netting Arrangement, before Offset | 113,652 | 175,034 |
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability, Notional Amount | 6,225,864 | 6,992,894 |
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Foreign Exchange Forward [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability, Notional Amount | 88,149 | 74,199 |
Not Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Forward Commitments to Sell Residential Mortgage Loans |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability, Notional Amount | 134,996 | 85,000 |
Fair Value, Inputs, Level 2 |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset, Notional Amount | 3,300 | 300 |
Derivative Liability, Notional Amount | 0 | 1,400 |
Fair Value, Measurements, Recurring | Interest Rate Lock Commitments [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 1,129 | 327 |
Fair Value, Measurements, Recurring | Designated as Hedging Instrument | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 11,063 | 2,960 |
Derivative Liability | 46 | 2,976 |
Fair Value, Measurements, Recurring | Not Designated as Hedging Instrument [Member] | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 74,500 | 88,541 |
Derivative Liability | 110,250 | 170,928 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Forward [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 3,200 | 4,315 |
Derivative Liability | 2,952 | 4,106 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Interest Rate Lock Commitments [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Designated as Hedging Instrument | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 11,063 | 2,960 |
Derivative Liability | 46 | 2,976 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Designated as Hedging Instrument | Foreign Exchange Forward [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 949 | 2,457 |
Derivative Liability | 866 | 563 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument [Member] | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 74,500 | 88,541 |
Derivative Liability | 110,250 | 170,928 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Derivative Financial Instruments, Assets [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 1,129 | 327 | $ 439
Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Forward Commitments |  | 300 |
Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Interest Rate Lock Commitements |  | 300 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Interest Rate Lock Commitments [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 1,129 | 327 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Designated as Hedging Instrument | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Derivative Liability | 0 | 0 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Not Designated as Hedging Instrument [Member] | Interest Rate Contract |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 0 | 0 |
Derivative Liability | 0 | 0 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Not Designated as Hedging Instrument [Member] | Interest Rate Lock Commitments [Member] |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Asset | 1,129 | 580 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Not Designated as Hedging Instrument [Member] | Forward Commitments to Sell Residential Mortgage Loans |  |  |
Derivative Instrument Detail [Abstract] |  |  |
Derivative Liability | $ 450 | $ 0 |

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- Definition Fair Value, Net Derivative Asset (Liability) Measured On Recurring Basis With Unobservable Inputs - Forward Commitments + References No definition available. + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 + Details
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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-7A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5C -Subparagraph (SX 210.12-13C(Column F)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5B -Subparagraph (SX 210.12-13B(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13(Column A)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5C -Subparagraph (SX 210.12-13C(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5A -Subparagraph (SX 210.12-13A(Column D)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5B -Subparagraph (SX 210.12-13B(Column B)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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