Securities - Contractual Maturities of Securities (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Available-for-sale, Amortized Cost
Due in one year or less	$ 72,066		$ 72,066
Due after one year through five years	22,989		22,989
Available-for-sale, Amortized Cost	202,772		202,772		$ 185,931
Available-for-sale, Fair Value
Due in one year or less	72,093		72,093
Due after one year through five years	23,060		23,060
Available-for-sale Securities, Total	204,880		204,880		187,565
Held-to-maturity, Amortized Cost
Held-to-maturity, Amortized Cost	44,678		44,678		50,713
Held-to-maturity, Fair Value
Held-to-maturity, Fair Value	44,901		44,901		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	81,890		81,890
Available-for-sale, Amortized Cost	81,890		81,890		100,002
Available-for-sale, Fair Value
Debt maturities without single maturity date	83,980		83,980
Available-for-sale Securities, Total	83,980		83,980		101,916
Held-to-maturity, Amortized Cost
Debt maturities without single maturity date	16,053		16,053
Held-to-maturity, Amortized Cost	16,053		16,053		16,823
Held-to-maturity, Fair Value
Debt maturities without single maturity date	16,362		16,362
Held-to-maturity, Fair Value	16,362		16,362		17,185
Collateralized Mortgage Backed Securities [Member]
Available-for-sale, Amortized Cost
Debt maturities without single maturity date	25,827		25,827
Available-for-sale, Amortized Cost	25,827		25,827		28,821
Available-for-sale, Fair Value
Debt maturities without single maturity date	25,747		25,747
Available-for-sale Securities, Total	25,747		25,747		28,605
Held-to-maturity, Amortized Cost
Debt maturities without single maturity date	28,625		28,625
Held-to-maturity, Amortized Cost	28,625		28,625		33,890
Held-to-maturity, Fair Value
Debt maturities without single maturity date	28,539		28,539
Held-to-maturity, Fair Value	$ 28,539		$ 28,539		$ 33,540