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Derivatives (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Derivative [Line Items] |  |
Notional amount of derivatives | $ 7,654,954,000 | $ 7,691,719,000
Fair value liability | 2,600,000 | 1,300,000
Credit risk-related contingent features, net liability position | 72,900,000 | 65,600,000
Credit risk-related contingent features, posted collateral | 72,500,000 | 66,000,000
Derivatives Designated as Hedging Instruments [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | 2,027,500,000 | 2,027,500,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] |  |
Derivative [Line Items] |  |
Amortization of accumulated other comprehensive loss on terminated cash flow hedges | 2,900,000 |
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 |
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 | $ 475,000,000 |
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 | $ 925,000,000 |
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 | $ 100,000,000 |
Derivative maturity expiration year | 2028 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |
Derivative [Line Items] |  |
Amortization of accumulated other comprehensive loss on terminated cash flow hedges | $ 16,600,000 |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | 477,500,000 | $ 477,500,000
Derivative hedged item | 443,100,000 |
Basis adjustment associated with hedged items loss | 34,400,000 |
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 | $ 514,300,000 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4H + Details
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