Accumulated Other Comprehensive Income Change in other comprehensive income (loss) for the period (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance beginning of period	$ 3,794	$ 232	$ 6,467
Unrealized holding gains (net of tax, $1,511, $3,212, and 1,979 for 2012, 2013 and 2014, respectively)	(2,015)	3,841	(6,234)
Reclassification adjustment (net of tax, $151, $142, and $63 for 2012, 2013 and 2014, respectively)	(92)	(123)	(276)
Unrealized gain on interest rate swaps (net of tax, $50, $142, and $82 for 2012, 2013 and 2014, respectively)	(6)	(160)	275
Reclassification adjustment for (gain) loss on interest rate swap ineffectiveness included in net income, net of tax of $2, ($2) and $0, respectively	(4)	4	0
Balance end of period	1,677	3,794	232
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Unrealized holding gains arising during the period, tax	1,037	(1,979)	3,212
Reclassification adjustment for investment securities, taxes	48	63	142
Unrealized gain (loss) on interest rate swap, tax	3	82	(142)
Reclassification adjustment for (gain) loss on interest rate swap ineffectiveness, tax	2	(2)	0
Unrealized Gains (Losses) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance beginning of period	3,979	261	6,771
Unrealized holding gains (net of tax, $1,511, $3,212, and 1,979 for 2012, 2013 and 2014, respectively)	(2,015)	3,841	(6,234)
Reclassification adjustment (net of tax, $151, $142, and $63 for 2012, 2013 and 2014, respectively)	(92)	(123)	(276)
Unrealized gain on interest rate swaps (net of tax, $50, $142, and $82 for 2012, 2013 and 2014, respectively)	0	0	0
Reclassification adjustment for (gain) loss on interest rate swap ineffectiveness included in net income, net of tax of $2, ($2) and $0, respectively	0	0
Balance end of period	1,872	3,979	261
Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance beginning of period	(185)	(29)	(304)
Unrealized holding gains (net of tax, $1,511, $3,212, and 1,979 for 2012, 2013 and 2014, respectively)	0	0	0
Reclassification adjustment (net of tax, $151, $142, and $63 for 2012, 2013 and 2014, respectively)	0	0	0
Unrealized gain on interest rate swaps (net of tax, $50, $142, and $82 for 2012, 2013 and 2014, respectively)	(6)	(160)	275
Reclassification adjustment for (gain) loss on interest rate swap ineffectiveness included in net income, net of tax of $2, ($2) and $0, respectively	(4)	4
Balance end of period	$ (195)	$ (185)	$ (29)