Investment Securities, Held-to-maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Amortized cost and fair value of the held to maturity securities [Abstract]
Amortized Cost	$ 63,543	$ 70,946
Gross Unrecognized Gains	4,146	4,396
Gross Unrecognized Losses	0	0
Fair Value	67,689	75,342
Mortgage-backed securities and collateralized mortgage obligations-residential [Member]
Amortized cost and fair value of the held to maturity securities [Abstract]
Amortized Cost	53,576	60,986
Gross Unrecognized Gains	3,225	3,334
Gross Unrecognized Losses	0	0
Fair Value	56,801	64,320
Corporate bonds [Member]
Amortized cost and fair value of the held to maturity securities [Abstract]
Amortized Cost	9,967	9,960
Gross Unrecognized Gains	921	1,062
Gross Unrecognized Losses	0	0
Fair Value	$ 10,888	$ 11,022