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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 198,135	$ 169,277	$ 177,264
Unrealized Gains	4,315	3,264	4,161
Unrealized Losses	(6,900)	(14,205)	(6,635)
Fair Value (Estimated)	195,550	158,336	174,790
US Treasury and Government [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	92,324	92,280	92,179
Unrealized Gains	5	1	10
Unrealized Losses	(6,343)	(12,757)	(5,944)
Fair Value (Estimated)	85,986	79,524	86,245
Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	65,835	35,712	42,389
Unrealized Gains	1,851	1,440	1,883
Unrealized Losses	(526)	(1,336)	(625)
Fair Value (Estimated)	67,160	35,816	43,647
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	39,676	40,985	42,396
Unrealized Gains	2,459	1,823	2,268
Unrealized Losses	(31)	(112)	(66)
Fair Value (Estimated)	42,104	42,696	44,598
Corporate Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	300	300	300
Unrealized Gains	0	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	$ 300	$ 300	$ 300