Securities Sold under Agreement to Repurchase and Other Borrowings (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Summary of securities sold under an agreement to repurchase and other borrowings
Securities sold under agreement to repurchase-term, Amount	$ 90,000	$ 90,000
Other borrowings, Amount	598	618
Total repurchase agreements and other, Amount	$ 90,598	$ 90,618
Securities sold under agreement to repurchase-term, Weighted average rate	4.01%	4.01%
Other borrowings, Weighted average rate	4.00%	4.00%
Total repurchase agreements and other, Weighted average rate	4.01%	4.01%