Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Retained Earnings [Member]
Cash dividend per share	$ 0.24	$ 0.24
Accumulated Other Comprehensive Gain (Loss) [Member]
Unrealized gain (loss) on securities net of tax expense (benefit)	$ (3,378)	$ 1,254
Treasury Stock [Member]
Purchase of common stock, shares	314,961	513,737