Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	$ 2,752	$ 85	$ 8,145	$ 2,931
Available-for-sale Securities, Gross Realized Losses	(22)	0	(50)	0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	(97)	(43)	(124)	(100)
Available-for-sale Securities, Gross Realized Gain (Loss)	2,633	42	7,971	2,831
Equity Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	2,135	0	4,357	2,603
Available-for-sale Securities, Gross Realized Losses	0	0	(28)	0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	0	(24)	(27)	(81)
Available-for-sale Securities, Gross Realized Gain (Loss)	2,135	(24)	4,302	2,522
Debt Securities [Member]
Gain (Loss) on Investments [Line Items]
Gross Realized Gains	617	85	3,788	328
Available-for-sale Securities, Gross Realized Losses	(22)	0	(22)	0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	(97)	(19)	(97)	(19)
Available-for-sale Securities, Gross Realized Gain (Loss)	$ 498	$ 66	$ 3,669	$ 309