Securities - Contractual Maturities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) security	Sep. 30, 2015 USD ($) security	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($) security	Dec. 31, 2015 USD ($)
Amortized Cost
Due in one year or less	$ 26,880		$ 26,880
Due after one year through five years	137,448		137,448
Due after five years through ten years	24,905		24,905
Due after ten years	9,445		9,445
Amortized Cost	198,678		198,678		$ 214,105
Estimated Fair Value
Due in one year or less	27,169		27,169
Due after one year through five years	142,067		142,067
Due after five years through ten years	25,817		25,817
Due after ten years	10,179		10,179
Fair Value	205,232		205,232		$ 219,476
Proceeds from sales and maturities and related gains and losses
Proceeds from maturities and calls of securities available for sale	16,770	$ 7,520	47,400	$ 24,400
Gross realized gains from maturities and calls of securities available for sale	$ 3	$ 22	13	$ 25
Proceeds from sales of securities available for sale			897
Gross realized gains from sales of securities available for sale			61
Gross realized losses from sales of securities available for sale			$ 26
Number of available-for-sale securities sold | security	0	0		0