Securities - Securities in Continuous Unrealized Loss Position (Details 3) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	$ 14,018	$ 60,966
Gross Unrealized Losses, Less than 12 Months	(19)	(138)
Fair Value, Less than 12 Months	13,999	60,828
Amortized Cost, More than 12 Months	6,977	16,999
Gross Unrealized Losses, More than 12 Months	(159)	(345)
Fair Value, More than 12 Months	6,818	16,654
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	8,593	12,414
Gross Unrealized Losses, Less than 12 Months	(70)	(92)
Fair Value, Less than 12 Months	8,523	12,322
Amortized Cost, More than 12 Months	16,043	18,552
Gross Unrealized Losses, More than 12 Months	(227)	(468)
Fair Value, More than 12 Months	$ 15,816	$ 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	$ 10,010	$ 37,049
Gross Unrealized Losses, Less than 12 Months	(3)	(85)
Fair Value, Less than 12 Months	10,007	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	4,008	20,403
Gross Unrealized Losses, Less than 12 Months	(16)	(53)
Fair Value, Less than 12 Months	3,992	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	1,690
Gross Unrealized Losses, Less than 12 Months	(34)
Fair Value, Less than 12 Months	1,656
Amortized Cost, More than 12 Months	2,590	4,564
Gross Unrealized Losses, More than 12 Months	(78)	(122)
Fair Value, More than 12 Months	2,512	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	6,977	12,559
Gross Unrealized Losses, More than 12 Months	(159)	(289)
Fair Value, More than 12 Months	6,818	12,270
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	6,903	12,414
Gross Unrealized Losses, Less than 12 Months	(36)	(92)
Fair Value, Less than 12 Months	6,867	12,322
Amortized Cost, More than 12 Months	13,453	13,988
Gross Unrealized Losses, More than 12 Months	(149)	(346)
Fair Value, More than 12 Months	$ 13,304	$ 13,642