Supplementary Income Statement Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Notes to Financial Statements
Other service charges, commissions, and fees - debit interchange income	$ 5,262	$ 4,757	$ 3,608
Other service charges, commissions, and fees - other interchange income	1,213	1,033	912
Other operating expenses - interchange expense	2,416	2,042	1,736
Other operating expenses - stationery and supplies	2,240	2,867	2,563
Other operating expenses - telephone expense	1,683	2,127	2,053
Other operating expenses - FDIC insurance expense	2,678	3,008	4,387
Other operating expenses - repossession and collection - non-covered	3,107	3,492	2,138
Other operating expenses - repossession and collection - covered, net of FDIC reimbursement and rental income	1,642	1,968	2,617
Other operating expenses - outside consultants	1,916	1,842	1,185
Other operating expenses - legal and audit	$ 1,722	$ 1,595	$ 1,572