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Derivatives (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) item
Derivative [Line Items] |  |
Notional amount of derivatives | $ 6,010,689 | $ 4,301,969
Available for sale debt securities, Amortized Cost | 4,637,610 |
Fair value liability | 5,700 | 7,300
Credit risk-related contingent features, net liability position | 12,900 | 400
Credit risk-related contingent features, posted collateral | 12,400 | 300
Derivatives Designated as Hedging Instruments [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | 1,659,400 | 1,358,110
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] |  |
Derivative [Line Items] |  |
Termination fees |  | 10,600
Amortization of accumulated other comprehensive loss on terminated cash flow hedges | 4,100 | $ 6,000
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement One To Five [Member] |  |
Derivative [Line Items] |  |
Number of interest rate swap terminated | item |  | 5
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 4, Expires 2021 [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 50,000 |
Derivative maturity expiration year | 2021 |
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 | $ 475,000 |
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 | $ 550,000 |
Derivative maturity expiration year | 2023 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement 3, Expires 2024 [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 100,000 |
Derivative maturity expiration year | 2024 |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |
Derivative [Line Items] |  |
Notional amount of derivatives | $ 441,400 |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Commercial Mortgage-Backed Securities [Member] |  |
Derivative [Line Items] |  |
Available for sale debt securities, Amortized Cost | 498,300 |
Interest Rate Swaps - Securities [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] | Other Liabilities [Member] |  |
Derivative [Line Items] |  |
Basis adjustment to interest rate swaps | $ 300 |

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