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v3.25.3

Derivatives (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) SwapAgreements | Sep. 30, 2024 USD ($) SwapAgreements | Dec. 31, 2024 USD ($)
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | $ 7,745,924,000 |  | $ 7,745,924,000 |  | $ 7,392,532,000
Payments (made) received to terminate hedge instruments |  |  | 2,270,000 | $ (13,730,000) |
Fair value hedges resulting net earnings | (2,751,000) | $ (8,881,000) | (8,788,000) | (31,440,000) |
Fair value liability | 1,900,000 |  | 1,900,000 |  | 2,100,000
Credit risk-related contingent features, net liability position | 17,500,000 |  | 17,500,000 |  | 39,100,000
Credit risk-related contingent features, posted collateral | 17,800,000 |  | 17,800,000 |  | 38,000,000
Fair Value Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value hedges resulting net earnings |  |  | 203,500,000 |  |
Derivatives Designated as Hedging Instruments [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 2,122,500,000 |  | $ 2,122,500,000 |  | 1,827,500,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Payments (made) received to terminate hedge instruments |  |  |  | $ (13,700,000) |
Number of terminated interest rate swap agreements | SwapAgreements |  |  | 0 | 4 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2025 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 50,000,000 |  | $ 50,000,000 |  |
Derivative maturity expiration year |  |  | 2025 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 4, Expires 2026 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 425,000,000 |  | $ 425,000,000 |  |
Derivative maturity expiration year |  |  | 2026 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 5, Expires 2027 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 825,000,000 |  | $ 825,000,000 |  |
Derivative maturity expiration year |  |  | 2027 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 6, Expires 2028 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 50,000,000 |  | $ 50,000,000 |  |
Derivative maturity expiration year |  |  | 2028 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 7, Expires 2029 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivatives | 75,000,000 |  | $ 75,000,000 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Payments (made) received to terminate hedge instruments |  |  | $ 2,300,000 |  |
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 | 397,500,000 |  | $ 397,500,000 |  | $ 477,500,000
Fair value hedges resulting net earnings | 4,798,000 | $ 3,215,000 | 13,398,000 | $ 9,437,000 |
Derivative hedged item | 374,400,000 |  | 374,400,000 |  |
Basis adjustment associated with hedged items loss | 23,100,000 |  | 23,100,000 |  |
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 | $ 432,200,000 |  | $ 432,200,000 |  |

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