Investment Securities HTM Gross Unrealized Losses (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAbstract
Unrealized losses on held to maturity securities, less than 12 months	$ (168)	$ (5,339)
Unrealized losses on held to maturity securities, 12 months or more	(1,298)	(383)
Total unrealized losses on held to maturity securities	(1,466)	(5,722)
Fair value of unrealized losses on held to maturity securities, less than 12 months	19,880	124,435
Fair value of unrealized losses on held to maturity securities, 12 months or more	59,720	5,010
Total fair value of unrealized losses on held to maturity securities	79,600	129,445
Obligations of state and political subdivisions (municipal securities) [Member]
HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAbstract
Unrealized losses on held to maturity securities, less than 12 months	(168)	(5,339)
Unrealized losses on held to maturity securities, 12 months or more	(1,298)	(383)
Total unrealized losses on held to maturity securities	(1,466)	(5,722)
Fair value of unrealized losses on held to maturity securities, less than 12 months	19,880	124,435
Fair value of unrealized losses on held to maturity securities, 12 months or more	59,720	5,010
Total fair value of unrealized losses on held to maturity securities	$ 79,600	$ 129,445
Obligations of state and political subdivisions (municipal securities) [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Less Than One Year [Member]
HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAbstract
Number of held to maturity securities in a continuous unrealized loss position less than twelve months	44	298
Obligations of state and political subdivisions (municipal securities) [Member] | Held To Maturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions Greater Than Or Equal To One Year [Member]
HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAbstract
Number of held to maturity securities in a continuous unrealized loss position less than twelve months	132	10