Other Operating Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Postage and supplies	$ 2,052	$ 2,239	$ 2,031
Promotional expense	2,345	1,646	1,588
Professional fees	2,183	3,141	1,892
Outside service fees	2,729	2,628	2,282
Data processing services	373	362	356
Telecommunications	754	641	627
Other	1,080	1,849	1,987
Total other operating expense	$ 11,516	$ 12,506	$ 10,763