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Derivative Activities (Derivative Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Assets Liabilities At Fair Value Net [Line Items]
Derivative Assets	$ 8,107us-gaap_DerivativeAssets	$ 20,502us-gaap_DerivativeAssets
Derivative Liabilities	11,221us-gaap_DerivativeLiabilities	14,937us-gaap_DerivativeLiabilities
Options tied to Standard & Poor 500 Stock Market Index [Member]
Derivative Assets Liabilities At Fair Value Net [Line Items]
Derivative Assets	5,555	16,430
Designated as Hedging Instrument [Member]
Derivative Assets Liabilities At Fair Value Net [Line Items]
Derivative Assets	0	850
Derivative Liabilities	8,585	11,757
Not Designated as Hedging Instrument [Member]
Derivative Assets Liabilities At Fair Value Net [Line Items]
Derivative Assets	2,399	2,861
Derivative Liabilities	2,399	2,861
Interest Rate Cap [Member]
Derivative Assets Liabilities At Fair Value Net [Line Items]
Derivative Assets	152	319
Derivative Liabilities	152	319
Other derivative
Derivative Assets Liabilities At Fair Value Net [Line Items]
Derivative Assets	1	42
Derivative Liabilities	$ 85	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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