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Derivatives (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) item | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |  |
Notional amount of derivatives | $ 2,849,743 |  | $ 2,799,296
Deposits | 26,959 | $ 12,819 |
Cash Flow Hedge [Member] |  |  |
Derivative [Line Items] |  |  |
Impact to interest income from cash flow hedges | (600) | 100 |
Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Impact to interest income of the fair value hedges | 100 | (100) |
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | 1,358,110 |  | 1,358,110
Interest Rate Swaps [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative income reflected in income statement | 1,500 | $ 500 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | 875,000 |  | 875,000
Termination fees | 10,600 |  |
Amortization of accumulated other comprehensive loss on terminated cash flow hedges | $ 1,000 |  |
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 agreements | item | 5 |  |
Number of interest rate swap terminated | item | 5 |  |
Notional amount of derivatives | $ 450,000 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date One [Member] | Swap Agreement 1, Expires 2022 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | $ 425,000 |  |
Derivative maturity expiration year | 2022 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Two [Member] | Swap Agreement 2, Expires 2023 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | $ 350,000 |  |
Derivative maturity expiration year | 2023 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Three [Member] | Swap Agreement 3, Expires 2024 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | $ 100,000 |  |
Derivative maturity expiration year | 2024 |  |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | $ 483,110 |  | $ 483,110

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