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Investment Securities Temporarily Impaired Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 89,296	$ 34,420	$ 73,680
Unrealized Losses (Less than 12 months)	(1,910)	(612)	(919)
Fair Value (Estimated) (12 months or more)	1,934	2,756	6,861
Unrealized Losses (12 months or more)	(121)	(127)	(154)
Fair Value (Estimated)	91,230	37,176	80,541
Unrealized Losses	(2,031)	(739)	(1,073)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	35,681	15,817	33,514
Unrealized Losses (Less than 12 months)	(289)	(182)	(435)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	35,681	15,817	33,514
Unrealized Losses	(289)	(182)	(435)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	23,546	9,982	35,242
Unrealized Losses (Less than 12 months)	(457)	(231)	(280)
Fair Value (Estimated) (12 months or more)	1,652	2,534	6,608
Unrealized Losses (12 months or more)	(69)	(83)	(81)
Fair Value (Estimated)	25,198	12,516	41,850
Unrealized Losses	(526)	(314)	(361)
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	30,069	8,621	4,924
Unrealized Losses (Less than 12 months)	(1,164)	(199)	(204)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	30,069	8,621	4,924
Unrealized Losses	(1,164)	(199)	(204)
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)	282	222	253
Unrealized Losses (12 months or more)	(52)	(44)	(73)
Fair Value (Estimated)	282	222	253
Unrealized Losses	$ (52)	$ (44)	$ (73)

X

- 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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