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Investment Securities Temporarily Impaired Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 240,605	$ 34,420	$ 15,315
Unrealized Losses (Less than 12 months)	(19,958)	(612)	(119)
Fair Value (Estimated) (12 months or more)	3,470	2,756	3,295
Unrealized Losses (12 months or more)	(166)	(127)	(135)
Fair Value (Estimated)	244,075	37,176	18,610
Unrealized Losses	(20,124)	(739)	(254)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	82,752	15,817	1,199
Unrealized Losses (Less than 12 months)	(8,684)	(182)	(21)
Fair Value (Estimated) (12 months or more)	0	0	0
Unrealized Losses (12 months or more)	0	0	0
Fair Value (Estimated)	82,752	15,817	1,199
Unrealized Losses	(8,684)	(182)	(21)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	84,609	9,982	12,990
Unrealized Losses (Less than 12 months)	(2,514)	(231)	(76)
Fair Value (Estimated) (12 months or more)	3,086	2,534	3,104
Unrealized Losses (12 months or more)	(133)	(83)	(31)
Fair Value (Estimated)	87,695	12,516	16,094
Unrealized Losses	(2,647)	(314)	(107)
US States and Political Subdivisions Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	73,244	8,621	1,123
Unrealized Losses (Less than 12 months)	(8,760)	(199)	(22)
Fair Value (Estimated) (12 months or more)	334	0	0
Unrealized Losses (12 months or more)	(30)	0	0
Fair Value (Estimated)	73,578	8,621	1,123
Unrealized Losses	(8,790)	(199)	(22)
Equity Securities, Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	0	3
Unrealized Losses (Less than 12 months)	0	0	0
Fair Value (Estimated) (12 months or more)	50	222	191
Unrealized Losses (12 months or more)	(3)	(44)	(104)
Fair Value (Estimated)	50	222	194
Unrealized Losses	$ (3)	$ (44)	$ (104)

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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