Securities - Securities in Continuous Unrealized Loss Position (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	$ 23,925	$ 95,031
Gross Unrealised Losses, Less than 12 Months	(63)	(1,244)
Fair Value, Less than 12 Months	23,862	93,787
Amortized Cost, More than 12 Months	26,140	4,481
Gross Unrealised Losses, More than 12 Months	(494)	(314)
Fair Value, More than 12 Months	25,646	4,167
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	9,929	29,093
Gross Unrealised Losses, Less than 12 Months	(61)	(1,135)
Fair Value, Less than 12 Months	9,868	27,958
Amortized Cost, More than 12 Months	21,100	1,022
Gross Unrealised Losses, More than 12 Months	(618)	(99)
Fair Value, More than 12 Months	20,482	923
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	20,052	25,008
Gross Unrealised Losses, Less than 12 Months	(25)	(95)
Fair Value, Less than 12 Months	20,027	24,913
Amortized Cost, More than 12 Months	5,000
Gross Unrealised Losses, More than 12 Months	(34)
Fair Value, More than 12 Months	4,966
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	3,873	51,576
Gross Unrealised Losses, Less than 12 Months	(38)	(934)
Fair Value, Less than 12 Months	3,835	50,642
Amortized Cost, More than 12 Months	8,222
Gross Unrealised Losses, More than 12 Months	(108)
Fair Value, More than 12 Months	8,114
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months		6,033
Gross Unrealised Losses, Less than 12 Months		(429)
Fair Value, Less than 12 Months		5,604
Amortized Cost, More than 12 Months	6,578	1,022
Gross Unrealised Losses, More than 12 Months	(248)	(99)
Fair Value, More than 12 Months	6,330	923
Collateralized Mortgage Backed Securities [Member]
Available-for-sale, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months		18,447
Gross Unrealised Losses, Less than 12 Months		(215)
Fair Value, Less than 12 Months		18,232
Amortized Cost, More than 12 Months	12,918	4,481
Gross Unrealised Losses, More than 12 Months	(352)	(314)
Fair Value, More than 12 Months	12,566	4,167
Held-to-maturity, Continuous Unrealized Loss Position [Abstract]
Amortized Cost, Less than 12 Months	9,929	23,060
Gross Unrealised Losses, Less than 12 Months	(61)	(706)
Fair Value, Less than 12 Months	9,868	22,354
Amortized Cost, More than 12 Months	14,522
Gross Unrealised Losses, More than 12 Months	(370)
Fair Value, More than 12 Months	$ 14,152