Consolidated Statement of Comprehensive Income Statement of Comprehensive Income Footnote (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Gain on securities	$ 0us-gaap_GainLossOnInvestments	$ 0us-gaap_GainLossOnInvestments	$ 89us-gaap_GainLossOnInvestments	$ 4,752us-gaap_GainLossOnInvestments	$ (272)us-gaap_GainLossOnInvestments	$ 5,222us-gaap_GainLossOnInvestments	$ 0us-gaap_GainLossOnInvestments	$ 409us-gaap_GainLossOnInvestments	$ 4,841us-gaap_GainLossOnInvestments	$ 5,359us-gaap_GainLossOnInvestments	$ 1,239us-gaap_GainLossOnInvestments
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent									0	0	(1,115)
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net									$ 0	$ 0	$ 1,115

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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