Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Disclosure Other Comprehensive Income Loss Detail [Line Items]
Unrealized holding gains (losses) on available-for-sale securities during the period, pre-tax	$ 4,087		$ (2,534)
Reclassification adjustment for (gains) losses included in net income, pre-tax	0	[1]	(14)	[1]
Net unrealized gains (losses) on available-for-sale securities, pre-tax	4,087		(2,548)
Unrealized holding gains (losses) on available-for-sale securities during the period, tax	(1,432)		887
Reclassification adjustment for (gains) losses included in net income, tax	0	[1]	5	[1]
Income tax effect	(1,432)		892
Unrealized holding gains (losses) on available-for-sale securities during the period, after-tax	2,655		(1,647)
Reclassification adjustment for (gains) losses included in net income, after-tax	0	[1]	(9)	[1]
Net unrealized gains (losses) on available-for-sale securities, after-tax	$ 2,655		$ (1,656)

[1] Pre-tax reclassification adjustments relating to available-for-sale securities are reported in security gains and the tax impact is included in income tax expense on the consolidated statements of income.