Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Consolidated Balance Sheets
Securities available for sale, amortized cost (in dollars)	$ 440,104	$ 493,066
Preferred stock, par value (in dollars per share)
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	14,658,954	14,608,556
Common stock, shares outstanding	14,658,954	14,608,556