Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets
Securities available for sale, amortized cost (in dollars)	$ 377,383	$ 343,059
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	13,915,265	13,819,319
Common stock, shares outstanding	13,915,265	13,819,319