Securities - Securities in Continuous Unrealized Loss Position (Details 3) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	$ 62,630	$ 60,966
Gross Unrealized Losses, Less than 12 Months	(93)	(138)
Fair Value, Less than 12 Months	62,537	60,828
Amortized Cost, More than 12 Months	7,302	16,999
Gross Unrealized Losses, More than 12 Months	(239)	(345)
Fair Value, More than 12 Months	7,063	16,654
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	14,869	12,414
Gross Unrealized Losses, Less than 12 Months	(126)	(92)
Fair Value, Less than 12 Months	14,743	12,322
Amortized Cost, More than 12 Months	16,785	18,552
Gross Unrealized Losses, More than 12 Months	(412)	(468)
Fair Value, More than 12 Months	$ 16,373	$ 18,084
Investment Securities Continuous Unrealized Loss Position Qualitative Disclosure Abstract
Securities in Unrealized Loss Position, Continuour Unrealized Loss as percent of Amortized Cost	10	10
US Treasury and Government [Member]
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	$ 50,049	$ 37,049
Gross Unrealized Losses, Less than 12 Months	(29)	(85)
Fair Value, Less than 12 Months	50,020	36,964
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	12,581	20,403
Gross Unrealized Losses, Less than 12 Months	(64)	(53)
Fair Value, Less than 12 Months	12,517	20,350
Amortized Cost, More than 12 Months		4,440
Gross Unrealized Losses, More than 12 Months		(56)
Fair Value, More than 12 Months		4,384
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	3,490
Gross Unrealized Losses, Less than 12 Months	(75)
Fair Value, Less than 12 Months	3,415
Amortized Cost, More than 12 Months	2,611	4,564
Gross Unrealized Losses, More than 12 Months	(113)	(122)
Fair Value, More than 12 Months	2,498	4,442
Collateralized Mortgage Backed Securities [Member]
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months		3,514
Fair Value, Less than 12 Months		3,514
Amortized Cost, More than 12 Months	7,302	12,559
Gross Unrealized Losses, More than 12 Months	(239)	(289)
Fair Value, More than 12 Months	7,063	12,270
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	11,379	12,414
Gross Unrealized Losses, Less than 12 Months	(51)	(92)
Fair Value, Less than 12 Months	11,328	12,322
Amortized Cost, More than 12 Months	14,174	13,988
Gross Unrealized Losses, More than 12 Months	(299)	(346)
Fair Value, More than 12 Months	$ 13,875	$ 13,642