Securities - Contractual Maturities of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Available-for-sale, Amortized Cost
Due in one year or less	$ 22,007		$ 22,007
Due after one year through five years	105,101		105,101
Due after ten years	236		236
Total	127,344		127,344
Available-for-sale, Amortized Cost	279,055		279,055		$ 275,379
Available-for-sale, Fair Value
Due in one year or less	22,050		22,050
Due after one year through five years	105,101		105,101
Due after five years through ten years	247		247
Total	127,398		127,398
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	127,344		127,344
Available-for-sale Securities, Total	280,560		280,560		276,021
Held-to-maturity, Amortized Cost
Held-to-maturity, Amortized Cost	37,729		37,729		42,130
Held-to-maturity, Fair Value
Held-to-maturity, Fair Value	38,006		38,006		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	107,017		107,017		129,752
Available-for-sale, Fair Value
Available-for-sale Securities, Total	108,262		108,262		130,705
Held-to-maturity, Amortized Cost
Held-to-maturity, Amortized Cost	15,088		15,088		15,002
Held-to-maturity, Fair Value
Held-to-maturity, Fair Value	15,413		15,413		15,179
Collateralized Mortgage Backed Securities [Member]
Available-for-sale, Amortized Cost
Debt maturities without single maturity date	151,711		151,711
Available-for-sale, Amortized Cost	44,694		44,694		51,569
Available-for-sale, Fair Value
Mortgage-backed securities and collateralized mortgage obligations	153,162		153,162
Available-for-sale Securities, Total	44,900		44,900		51,329
Held-to-maturity, Amortized Cost
Debt maturities without single maturity date	37,729		37,729
Held-to-maturity, Amortized Cost	22,641		22,641		27,128
Held-to-maturity, Fair Value
Debt maturities without single maturity date	38,006		38,006
Held-to-maturity, Fair Value	$ 22,593		$ 22,593		$ 26,817