Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013
Available-for-sale securities [Abstract]
Fair/Book Value, Total	$ 399,743		$ 404,639		$ 515,573
Held To Maturity Securities [Abstract]
Book Value	65,655		68,505		67,708
Fair Value	66,109
Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	400,956		408,897		506,048
Gross Unrealized Gains	4,228		3,455		10,850
Gross Unrealized Losses	5,441		7,713		1,325
Fair/Book Value, Total	399,743		404,639		515,573
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months Fair Value	127,107		211,033		133,929
12 Months or More Fair Value	18,455		2,457		0
Total Fair Value	145,562		213,490		133,929
Less Than 12 Months Unrealized Loss	4,545		7,672		1,325
12 Months or More Unrealized Loss	896		41		0
Total Unrealized Loss	5,441		7,713		1,325
Held-to-maturity Securities [Member]
Held To Maturity Securities [Abstract]
Book Value	65,655		68,505		67,708
Gross Unrealized Gains	711		812		1,904
Gross Unrealized Losses	257		627		22
Fair Value	66,109		68,690		69,590
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than Twelve Months Fair Value	9,038		9,518		2,841
Twelve Months or More Fair Value	0		0		0
Total Fair Value	9,038		9,518		2,841
Less than 12 Months Unrealized Loss	257		627		22
12 Months or Longer Unrealized Loss	0		0		0
Total Unrealized Loss	257		627		22
Government Agency & Government Sponsored Entities [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	18,242		28,287		26,436
Gross Unrealized Gains	184		149		256
Gross Unrealized Losses	0		0		0
Fair/Book Value, Total	18,426		28,436		26,692
Obligations of States and Political Subdivisions [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost					5,643
Gross Unrealized Gains					0
Gross Unrealized Losses					0
Fair/Book Value, Total					5,643
Obligations of States and Political Subdivisions [Member] | Held-to-maturity Securities [Member]
Held To Maturity Securities [Abstract]
Book Value	62,890		65,685		65,165
Gross Unrealized Gains	711		812		1,896
Gross Unrealized Losses	257		627		22
Fair Value	63,344		65,870		67,039
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than Twelve Months Fair Value	9,038		9,518		2,841
Twelve Months or More Fair Value	0		0		0
Total Fair Value	9,038		9,518		2,841
Less than 12 Months Unrealized Loss	257		627		22
12 Months or Longer Unrealized Loss	0		0		0
Total Unrealized Loss	257		627		22
Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	331,434	[1]	329,469	[1]	423,298	[1]
Gross Unrealized Gains	3,674	[1]	3,026	[1]	10,273	[1]
Gross Unrealized Losses	5,378	[1]	7,566	[1]	1,286	[1]
Fair/Book Value, Total	329,730	[1]	324,929	[1]	432,285	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months Fair Value	123,313		195,736		115,238
12 Months or More Fair Value	15,981		0		0
Total Fair Value	139,294		195,736		115,238
Less Than 12 Months Unrealized Loss	4,506		7,566		1,286
12 Months or More Unrealized Loss	872		0		0
Total Unrealized Loss	5,378		7,566		1,286
Mortgage Backed Securities [Member] | Held-to-maturity Securities [Member]
Held To Maturity Securities [Abstract]
Book Value	4		45		341
Gross Unrealized Gains	0		0		8
Gross Unrealized Losses	0		0		0
Fair Value	4		45		349
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Total Unrealized Loss	0		0		0
Corporate Securities [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	49,045		49,247		49,846
Gross Unrealized Gains	370		280		321
Gross Unrealized Losses	63		147		39
Fair/Book Value, Total	49,352		49,380		50,128
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months Fair Value	3,794		15,297		18,691
12 Months or More Fair Value	2,474		2,457		0
Total Fair Value	6,268		17,754		18,691
Less Than 12 Months Unrealized Loss	39		106		39
12 Months or More Unrealized Loss	24		41		0
Total Unrealized Loss	63		147		39
Other [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	2,235		1,894		825
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	0		0		0
Fair/Book Value, Total	2,235		1,894		825
Other [Member] | Held-to-maturity Securities [Member]
Held To Maturity Securities [Abstract]
Book Value	2,761		2,775		2,202
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	0		0		0
Fair Value	2,761		2,775		2,202
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Total Unrealized Loss	$ 0		$ 0		$ 0

[1] All Mortgage Backed Securities consist of securities collateralized by residential real estate and were issued by an agency or government sponsored entity of the U.S. government.