Securities (Unrealized Loss NOT deemed to be OTTI) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014 holding	Dec. 31, 2013 holding
Summary of gross unrealized losses and fair value of investments
No of holdings	67	221
Fair value, less than 12 months	$ 43,990	$ 433,230
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(512)	(13,520)
Fair value, 12 months or longer	160,232	10,928
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(7,958)	(2,490)
Fair value, Total	204,222	444,158
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position aggregate loss	(8,470)	(16,010)
U. S. Government Agency Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	3	39
Fair value, less than 12 months	493	39,950
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(2)	(885)
Fair value, 12 months or longer	9,981
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(27)
Fair value, Total	10,474	39,950
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position aggregate loss	(29)	(885)
Agency Mortgage-Backed Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	34	124
Fair value, less than 12 months	665	202,004
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(6)	(5,217)
Fair value, 12 months or longer	46,015	5,108
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(1,363)	(372)
Fair value, Total	46,680	207,112
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position aggregate loss	(1,369)	(5,589)
Agency Collateralized Mortgage Obligations [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	15	19
Fair value, less than 12 months	42,761	183,721
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(502)	(7,278)
Fair value, 12 months or longer	100,254	0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(4,809)
Fair value, Total	143,015	183,721
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position aggregate loss	(5,311)	(7,278)
US States and Political Subdivisions Debt Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings		13
Fair value, less than 12 months		3,838
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(28)
Fair value, 12 months or longer		0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months
Fair value, Total		3,838
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position aggregate loss		(28)
Pooled Trust Preferred Securities Issued by Banks and Insurers [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	7	2
Fair value, less than 12 months	0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months
Fair value, 12 months or longer	2,520	2,300
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(1,594)	(1,913)
Fair value, Total	2,520	2,300
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position aggregate loss	(1,594)	(1,913)
Single Trust Preferred Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings		2
Fair value, less than 12 months		1,341
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months		(22)
Fair value, 12 months or longer		0
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months
Fair value, Total		1,341
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position aggregate loss		(22)
Marketable Equity Securities [Member]
Summary of gross unrealized losses and fair value of investments
No of holdings	8	22
Fair value, less than 12 months	71	2,376
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for less than 12 months	(2)	(90)
Fair value, 12 months or longer	1,462	3,520
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position for more than 12 months	(165)	(205)
Fair value, Total	1,533	5,896
Unrealized loss position for available for sale and held to maturity securities in a continuous loss position aggregate loss	$ (167)	$ (295)