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Investments - Below investment grade securities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Schedule of Available-for-sale Securities
Debt securities, amortized cost	$ 426,092
Available-for-sale investment securities	430,260		$ 432,535
Unrealized Gain (Loss)	4,168	$ 8,896
Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Debt securities, amortized cost	2,636		$ 3,079
Unrealized Gain (Loss)	1,624
Below investment grade | Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Debt securities, amortized cost	$ 2,234

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- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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