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Investment Securities Amortized Cost and Estimated Fair Value of Available for Sale 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]
Amortized Cost	$ 277,948	$ 279,399	$ 306,206
Unrealized Gains	9,940	12,753	11,389
Unrealized Losses	(1,519)	(538)	(484)
Fair Value (Estimated)	286,369	291,614	317,111
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	153,477	164,752	226,671
Unrealized Gains	4,028	4,636	5,805
Unrealized Losses	(308)	(295)	(361)
Fair Value (Estimated)	157,197	169,093	232,115
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	122,893	113,069	77,672
Unrealized Gains	5,866	8,074	5,540
Unrealized Losses	(1,159)	(199)	(50)
Fair Value (Estimated)	127,600	120,944	83,162
Equity Securities, Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,578	1,578	1,863
Unrealized Gains	46	43	44
Unrealized Losses	(52)	(44)	(73)
Fair Value (Estimated)	$ 1,572	$ 1,577	$ 1,834

X

- Definition

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

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