Accumulated Other Comprehensive Income (Loss) Change in other comprehensive income (loss) for the period (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance beginning of period	$ 6,467	$ 3,926	$ (1,012)
Unrealized holding gains (net of tax, $2,826, $1,511 and $3,212 for 2011, 2012 and 2013, respectively)	(6,234)	2,932	5,485
Reclassification adjustment (net of tax, $156, $151 and $142 for 2011, 2012 and 2013, respectively)	(276)	(294)	(304)
Unrealized losses on securities for which an other-than-temporary impairment loss has been recognized in earnings (net of tax, $9 in 2011)			16
Unrealized gain on interest rate swaps (net of tax, $213, $50 and $142 for 2011, 2012 and 2013, respectively)	275	(97)	(413)
Change in benefit obligation and plan assets for defined benefit pension plan (net of tax, $80 in 2011)			154
Balance end of period	232	6,467	3,926
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosures [Abstract]
Unrealized holding gains losses arising during the period, taxes	3,212	1,511	2,826
Reclassification adjustment for investment securities, taxes	142	151	156
Unrealized losses on securities for which an other-than-temporary impairment loss recognized, taxes	0	0	9
Unrealized gain on interest rate swaps, tax	142	50	213
Change in benefit obligation and plan assets for defined benefit pension plan, taxes	0	0	80
Unrealized Gains (Losses) on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance beginning of period	6,771	4,133	(1,064)
Unrealized holding gains (net of tax, $2,826, $1,511 and $3,212 for 2011, 2012 and 2013, respectively)	(6,234)	2,932	5,485
Reclassification adjustment (net of tax, $156, $151 and $142 for 2011, 2012 and 2013, respectively)	(276)	(294)	(304)
Unrealized losses on securities for which an other-than-temporary impairment loss has been recognized in earnings (net of tax, $9 in 2011)			16
Unrealized gain on interest rate swaps (net of tax, $213, $50 and $142 for 2011, 2012 and 2013, respectively)	0	0	0
Change in benefit obligation and plan assets for defined benefit pension plan (net of tax, $80 in 2011)			0
Balance end of period	261	6,771	4,133
Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance beginning of period	(304)	(207)	206
Unrealized holding gains (net of tax, $2,826, $1,511 and $3,212 for 2011, 2012 and 2013, respectively)	0	0	0
Reclassification adjustment (net of tax, $156, $151 and $142 for 2011, 2012 and 2013, respectively)	0	0	0
Unrealized losses on securities for which an other-than-temporary impairment loss has been recognized in earnings (net of tax, $9 in 2011)			0
Unrealized gain on interest rate swaps (net of tax, $213, $50 and $142 for 2011, 2012 and 2013, respectively)	275	(97)	(413)
Change in benefit obligation and plan assets for defined benefit pension plan (net of tax, $80 in 2011)			0
Balance end of period	(29)	(304)	(207)
Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance beginning of period	0	0	(154)
Unrealized holding gains (net of tax, $2,826, $1,511 and $3,212 for 2011, 2012 and 2013, respectively)	0	0	0
Reclassification adjustment (net of tax, $156, $151 and $142 for 2011, 2012 and 2013, respectively)	0	0	0
Unrealized losses on securities for which an other-than-temporary impairment loss has been recognized in earnings (net of tax, $9 in 2011)			0
Unrealized gain on interest rate swaps (net of tax, $213, $50 and $142 for 2011, 2012 and 2013, respectively)	0	0	0
Change in benefit obligation and plan assets for defined benefit pension plan (net of tax, $80 in 2011)			154
Balance end of period	$ 0	$ 0	$ 0