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Investment Securities Temporarily Impaired Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 215,897	$ 34,420	$ 21,483
Unrealized Losses (Less than 12 months)	(15,841)	(612)	(194)
Fair Value (Estimated) (12 months or more)	1,695	2,756	5,328
Unrealized Losses (12 months or more)	(107)	(127)	(283)
Fair Value (Estimated)	217,592	37,176	26,811
Unrealized Losses	(15,948)	(739)	(477)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	85,453	15,817	7,942
Unrealized Losses (Less than 12 months)	(5,944)	(182)	(33)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	85,453	15,817	7,942
Unrealized Losses	(5,944)	(182)	(33)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	58,706	9,982	9,822
Unrealized Losses (Less than 12 months)	(2,039)	(231)	(110)
Fair Value (Estimated) (12 months or more)	1,585	2,534	5,137
Unrealized Losses (12 months or more)	(99)	(83)	(148)
Fair Value (Estimated)	60,291	12,516	14,959
Unrealized Losses	(2,138)	(314)	(258)
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	71,738	8,621	3,719
Unrealized Losses (Less than 12 months)	(7,858)	(199)	(51)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	71,738	8,621	3,719
Unrealized Losses	(7,858)	(199)	(51)
Equity Securities, Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	0	0
Unrealized Losses (Less than 12 months)	0	0	0
Fair Value (Estimated) (12 months or more)	110	222	191
Unrealized Losses (12 months or more)	(8)	(44)	(135)
Fair Value (Estimated)	110	222	191
Unrealized Losses	$ (8)	$ (44)	$ (135)

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- Definition

Amount of the excess of amortized cost basis over fair value of securities that have been in a loss position for twelve months or longer for securities which are categorized neither as held-to-maturity nor trading securities.

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