Changes and Reclassifications Out of Accumulated Other Comprehensive Income - Reclassifications out of AOCI by Component of Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized (gains) losses on sale of securities									$ 178	$ 189	$ 832
Income tax expense (benefit)	577	471	586	292	491	538	324	581	1,926	1,934	1,156
Reclassified amount, net of tax	1,543	1,410	1,706	856	1,329	1,206	1,120	1,186	5,515	4,841	3,727
Effective tax rate									34.00%	34.00%	34.00%
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Realized (gains) losses on sale of securities									178	189	832
Income tax expense (benefit)									60	65	286
Reclassified amount, net of tax									$ 118	$ 124	$ 546