Securities - Contractual Maturities of Securities (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Available-for-sale, Amortized Cost
Due in one year or less	$ 65,053		$ 65,053
Due after one year through five years	30,016		30,016
Available-for-sale, Amortized Cost	209,659		209,659		$ 185,931
Available-for-sale, Fair Value
Due in one year or less	65,038		65,038
Due after one year through five years	30,088		30,088
Available-for-sale Securities, Total	211,463		211,463		187,565
Held-to-maturity, Amortized Cost
Held-to-maturity, Amortized Cost	47,419		47,419		50,713
Held-to-maturity, Fair Value
Held-to-maturity, Fair Value	47,344		47,344		50,725
Proceeds from sale of securities
Proceeds from Sale of Held-to-maturity Securities	0	$ 0	0	$ 0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale, Amortized Cost
Debt maturities without single maturity date	87,738		87,738
Available-for-sale, Amortized Cost	87,738		87,738		100,002
Available-for-sale, Fair Value
Debt maturities without single maturity date	89,604		89,604
Available-for-sale Securities, Total	89,604		89,604		101,916
Held-to-maturity, Amortized Cost
Debt maturities without single maturity date	16,919		16,919
Held-to-maturity, Amortized Cost	16,919		16,919		16,823
Held-to-maturity, Fair Value
Debt maturities without single maturity date	17,133		17,133
Held-to-maturity, Fair Value	17,133		17,133		17,185
Collateralized Mortgage Backed Securities [Member]
Available-for-sale, Amortized Cost
Debt maturities without single maturity date	26,852		26,852
Available-for-sale, Amortized Cost	26,852		26,852		28,821
Available-for-sale, Fair Value
Debt maturities without single maturity date	26,733		26,733
Available-for-sale Securities, Total	26,733		26,733		28,605
Held-to-maturity, Amortized Cost
Debt maturities without single maturity date	30,500		30,500
Held-to-maturity, Amortized Cost	30,500		30,500		33,890
Held-to-maturity, Fair Value
Debt maturities without single maturity date	30,211		30,211
Held-to-maturity, Fair Value	$ 30,211		$ 30,211		$ 33,540