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v3.26.1

Derivatives (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 USD ($) SwapAgreements | Mar. 31, 2025 USD ($) SwapAgreements | Dec. 31, 2025 USD ($)
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 8,315,062,000 |  | $ 8,040,346,000
Payments (made) received to terminate hedge instruments |  | 1,657,000 |  |
Fair value hedges resulting net earnings | [1] | 47,167,000 | $ (4,517,000) |
Fair value liability |  | 1,100,000 |  | 1,300,000
Credit risk-related contingent features, net liability position |  | 13,200,000 |  | 13,200,000
Credit risk-related contingent features, posted collateral |  | 13,600,000 |  | 13,000,000
Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | 265,000,000 | $ 125,000,000 |
Derivatives Designated as Hedging Instruments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | 2,159,000,000 |  | 2,172,500,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2026 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 350,000,000 |  |
Derivative maturity expiration year |  | 2026 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 4, Expires 2027 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 825,000,000 |  |
Derivative maturity expiration year |  | 2027 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 5, Expires 2028 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 50,000,000 |  |
Derivative maturity expiration year |  | 2028 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 6, Expires 2029 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 275,000,000 |  |
Derivative maturity expiration year |  | 2029 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 7, Expires 2030 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 300,000,000 |  |
Derivative maturity expiration year |  | 2030 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Payments (made) received to terminate hedge instruments |  | $ 1,700,000 |  |
Number of terminated interest rate swap agreements | SwapAgreements |  | 1 | 0 |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount of derivatives |  | $ 359,000,000 |  | $ 397,500,000
Fair value hedges resulting net earnings | [1] | 1,674,000 | $ 3,910,000 |
Derivative hedged item |  | 335,600,000 |  |
Basis adjustment associated with hedged items loss |  | 23,400,000 |  |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Commercial Mortgage-Backed Securities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Amortized cost basis of closed portfolio of pre-payable securities |  | $ 387,800,000 |  |
[1] | Includes the effects of both active derivative instruments and the impact from realization of basis adjustments to hedged assets resulting from previously terminated hedges.

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 + Details
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