Securities - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Available-for-sale, Amortized Cost
Due in one year or less	$ 24,016		$ 24,016
Due after one year through five years	9,770		9,770
Due after ten years	236		236
Total	34,022		34,022
Available-for-sale, Amortized Cost	195,788		195,788		$ 275,379
Available-for-sale, Fair Value
Due in one year or less	24,039		24,039
Due after one year through five years	9,809		9,809
Due after five years through ten years	246		246
Total	34,094		34,094
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	34,022		34,022
Available-for-sale Securities, Total	197,401		197,401		276,021
Held-to-maturity, Amortized Cost
Held-to-maturity, Amortized Cost	39,628		39,628		42,130
Held-to-maturity, Fair Value
Held-to-maturity, Fair Value	39,909		39,909		41,996
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
Available-for-sale, Amortized Cost	114,716		114,716		129,752
Available-for-sale, Fair Value
Available-for-sale Securities, Total	116,179		116,179		130,705
Held-to-maturity, Amortized Cost
Held-to-maturity, Amortized Cost	15,464		15,464		15,002
Held-to-maturity, Fair Value
Held-to-maturity, Fair Value	15,753		15,753		15,179
Collateralized Mortgage Backed Securities [Member]
Available-for-sale, Amortized Cost
Debt maturities without single maturity date	161,766		161,766
Available-for-sale, Amortized Cost	47,050		47,050		51,569
Available-for-sale, Fair Value
Mortgage-backed securities and collateralized mortgage obligations	163,307		163,307
Available-for-sale Securities, Total	47,128		47,128		51,329
Held-to-maturity, Amortized Cost
Debt maturities without single maturity date	39,628		39,628
Held-to-maturity, Amortized Cost	24,164		24,164		27,128
Held-to-maturity, Fair Value
Debt maturities without single maturity date	39,909		39,909
Held-to-maturity, Fair Value	$ 24,156		$ 24,156		$ 26,817