Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013
Available-for-sale securities [Abstract]
Fair/Book Value, Total	$ 401,732		$ 404,639		$ 475,414
Held To Maturity Securities [Abstract]
Book Value	70,340		68,505		67,059
Fair Value	70,933
Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	398,343		408,897		478,813
Gross Unrealized Gains	6,275		3,455		4,708
Gross Unrealized Losses	2,886		7,713		8,107
Fair/Book Value, Total	401,732		404,639		475,414
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months Fair Value	8,390		211,033		235,960
12 Months or More Fair Value	95,730		2,457		0
Total Fair Value	104,120		213,490		235,960
Less Than 12 Months Unrealized Loss	4		7,672		8,107
12 Months or More Unrealized Loss	2,882		41		0
Total Unrealized Loss	2,886		7,713		8,107
Held-to-maturity Securities [Member]
Held To Maturity Securities [Abstract]
Book Value	70,340		68,505		67,059
Gross Unrealized Gains	683		812		1,255
Gross Unrealized Losses	90		627		531
Fair Value	70,933		68,690		67,783
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than Twelve Months Fair Value	4,740		9,518		9,626
Twelve Months or More Fair Value	5,137		0		0
Total Fair Value	9,877		9,518		9,626
Less than 12 Months Unrealized Loss	32		627		531
12 Months or Longer Unrealized Loss	58		0		0
Total Unrealized Loss	90		627		531
Government Agency & Government Sponsored Entities [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	18,230		28,287		26,327
Gross Unrealized Gains	194		149		155
Gross Unrealized Losses	0		0		0
Fair/Book Value, Total	18,424		28,436		26,482
Obligations of States and Political Subdivisions [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost					5,612
Gross Unrealized Gains					0
Gross Unrealized Losses					0
Fair/Book Value, Total					5,612
Obligations of States and Political Subdivisions [Member] | Held-to-maturity Securities [Member]
Held To Maturity Securities [Abstract]
Book Value	67,866		65,685		64,648
Gross Unrealized Gains	683		812		1,252
Gross Unrealized Losses	90		627		531
Fair Value	68,459		65,870		65,369
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Less than Twelve Months Fair Value	4,740		9,518		9,626
Twelve Months or More Fair Value	5,137		0		0
Total Fair Value	9,877		9,518		9,626
Less than 12 Months Unrealized Loss	32		627		531
12 Months or Longer Unrealized Loss	58		0		0
Total Unrealized Loss	90		627		531
Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	323,518	[1]	329,469	[1]	396,041	[1]
Gross Unrealized Gains	5,688	[1]	3,026	[1]	4,373	[1]
Gross Unrealized Losses	2,871	[1]	7,566	[1]	7,840	[1]
Fair/Book Value, Total	326,335	[1]	324,929	[1]	392,574	[1]
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months Fair Value	0		195,736		205,363
12 Months or More Fair Value	92,992		0		0
Total Fair Value	92,992		195,736		205,363
Less Than 12 Months Unrealized Loss	0		7,566		7,840
12 Months or More Unrealized Loss	2,871		0		0
Total Unrealized Loss	2,871		7,566		7,840
Mortgage Backed Securities [Member] | Held-to-maturity Securities [Member]
Held To Maturity Securities [Abstract]
Book Value			45		217
Gross Unrealized Gains			0		3
Gross Unrealized Losses			0		0
Fair Value			45		220
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]
Total Unrealized Loss			0		0
Corporate Securities [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	54,283		49,247		49,647
Gross Unrealized Gains	393		280		180
Gross Unrealized Losses	15		147		267
Fair/Book Value, Total	54,661		49,380		49,560
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Less Than 12 Months Fair Value	8,390		15,297		30,597
12 Months or More Fair Value	2,738		2,457		0
Total Fair Value	11,128		17,754		30,597
Less Than 12 Months Unrealized Loss	4		106		267
12 Months or More Unrealized Loss	11		41		0
Total Unrealized Loss	15		147		267
Other [Member] | Available-for-sale Securities [Member]
Available-for-sale securities [Abstract]
Amortized Cost	2,312		1,894		1,186
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	0		0		0
Fair/Book Value, Total	2,312		1,894		1,186
Other [Member] | Held-to-maturity Securities [Member]
Held To Maturity Securities [Abstract]
Book Value	2,474		2,775		2,194
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	0		0		0
Fair Value	2,474		2,775		2,194
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.