Condensed Consolidated Balance Sheets (unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Cash and due from banks	$ 54,589	$ 73,451
Interest bearing deposits	111,128	127,438
Federal funds sold	2,227	6,671
Cash and cash equivalents	167,944	207,560
Certificates of deposit in other banks	9,320	5,336
Securities available-for-sale at fair value (amortized cost of $660,611 and $583,858, respectively)	677,510	603,343
Securities held-to-maturity at amortized cost (fair value of $1,656 and $1,659, respectively)	1,662	1,662
Loans held for sale	1,449	22,486
Loans	2,563,314	2,550,573
Allowance for loan losses	(33,393)	(33,245)
Net loans	2,529,921	2,517,328
Premises and equipment, net	53,491	54,321
Federal Home Loan Bank stock	25,673	25,673
Federal Reserve Bank stock	4,886	4,885
Goodwill	65,490	65,490
Core deposit intangible (net of accumulated amortization of $7,765 and $7,712, respectively)	850	904
Bank owned life insurance	53,166	44,893
Mortgage servicing rights	2,652	2,364
Other real estate owned	45,720	47,537
Other assets	32,361	31,882
Total assets	3,672,095	3,635,664
Deposits
Noninterest bearing	619,819	606,448
Interest bearing	2,313,761	2,297,400
Total deposits	2,933,580	2,903,848
Repurchase agreements	213,573	210,120
Federal funds purchased and other short-term borrowings	15,272	12,314
Advances from Federal Home Loan Bank	1,387	1,429
Long-term debt	61,341	61,341
Other liabilities	40,308	46,268
Total liabilities	3,265,461	3,235,320
Shareholders' equity:
Preferred stock, 300,000 shares authorized and unissued	0	0
Common stock, $5 par value, shares authorized 25,000,000; shares outstanding 2013 - 15,653,090; 2012 - 15,612,935	78,266	78,065
Capital surplus	161,520	160,670
Retained earnings	155,864	148,944
Accumulated other comprehensive income, net of tax	10,984	12,665
Total shareholders' equity	406,634	400,344
Total liabilities and shareholders' equity	$ 3,672,095	$ 3,635,664