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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 281,740	$ 169,277	$ 172,251
Unrealized Gains	4,935	3,264	3,779
Unrealized Losses	(5,896)	(14,205)	(9,761)
Fair Value (Estimated)	280,779	158,336	166,269
US Treasury and Government [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	92,332	92,280	92,226
Unrealized Gains	2	1	11
Unrealized Losses	(5,271)	(12,757)	(8,684)
Fair Value (Estimated)	87,063	79,524	83,553
Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	61,138	35,712	37,915
Unrealized Gains	1,695	1,440	1,701
Unrealized Losses	(587)	(1,336)	(997)
Fair Value (Estimated)	62,246	35,816	38,619
US States and Political Subdivisions Debt Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	127,970	40,985	41,810
Unrealized Gains	3,238	1,823	2,067
Unrealized Losses	(38)	(112)	(80)
Fair Value (Estimated)	131,170	42,696	43,797
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