Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Retained Earnings [Member]
Cash dividend per share	$ 0.12	$ 0.12
Accumulated Other Comprehensive Gain (Loss) [Member]
Unrealized gain on securities net of tax expense	$ 539	$ 1,003
Treasury Stock [Member]
Purchase of common stock, shares	254,340	113,500