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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | $ 43,903 | $ 23,251
Fair Values, Liabilities | [1] | 43,184 | 23,968
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 800,000 | 500,000
Fair Values, Assets | [2] | 3,330 |
Fair Values, Liabilities | [2] |  | 281
Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 1,148,279 | 1,002,350
Fair Values, Assets | [2] | 40,573 | 23,251
Fair Values, Liabilities | [2] | 43,184 | 23,687
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts | [3] | 856,332 | 780,871
Fair Values, Assets | [2],[3] | 38,389 | 20,622
Fair Values, Liabilities | [2],[3] | 40,202 | 21,007
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 88,946 | 83,430
Fair Values, Assets | [2] | 114 | 83
Fair Values, Liabilities | [2] | 243 | 162
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 105,357 | 55,128
Fair Values, Assets | [2] | 23 | 263
Fair Values, Liabilities | [2] | 1,404 | 336
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 62,622 | 38,853
Fair Values, Assets | [2] | 703 | 243
Fair Values, Liabilities | [2] | 12 | 167
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 35,022 | 44,068
Fair Values, Assets | [2] | 1,344 | 2,040
Fair Values, Liabilities | [2] | 1,323 | 2,015
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 800,000 | 500,000
Fair Values, Assets | [2] | $ 3,330 |
Fair Values, Liabilities | [2] |  | $ 281
[1] | For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.
[2] | Derivative assets and liabilities are reported with other assets or other liabilities, respectively, in the consolidated balance sheets.
[3] | The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions.

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