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Derivatives (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Derivative [Line Items] |  |
Notional amount of derivatives | $ 8,576,234 | $ 8,649,657
Fair value liability | 2,300 | 4,100
Credit risk-related contingent features, net liability position | 15,600 | 49,400
Credit risk-related contingent features, posted collateral | 14,900 | 15,000
Derivatives Designated as Hedging Instruments [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | 2,984,900 | 2,962,650
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 | 23,700 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 1, Expires 2022 [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 125,000 |
Derivative maturity expiration year | 2022 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 2, Expires 2023 [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 150,000 |
Derivative maturity expiration year | 2023 |
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 |
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 | $ 600,000 |
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 | $ 1,000,000 |
Derivative maturity expiration year | 2027 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 6, Expires Thereafter [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 100,000 |
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 | 74,000 |
Basis adjustment associated with hedged items | 62,700 |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | 934,900 | $ 1,837,650
Derivative hedged item | 872,200 |
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 | $ 1,000,000 |

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