Condensed Consolidated Statements of Income and Other Comprehensive Income (unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Interest income:
Interest and fees on loans, including loans held for sale	$ 32,848	$ 35,052
Interest and dividends on securities
Taxable	2,895	2,771
Tax exempt	558	477
Interest and dividends on Federal Reserve Bank and Federal Home Loan Bank stock	348	364
Other, including interest on federal funds sold	127	162
Total interest income	36,776	38,826
Interest expense:
Interest on deposits	3,019	4,471
Interest on repurchase agreements and other short-term borrowings	263	338
Interest on advances from Federal Home Loan Bank	7	11
Interest on long-term debt	290	1,000
Total interest expense	3,579	5,820
Net interest income	33,197	33,006
Provision for loan losses	1,559	1,160
Net interest income after provision for loan losses	31,638	31,846
Noninterest income:
Service charges on deposit accounts	5,767	5,872
Gains on sales of loans, net	1,397	617
Trust income	2,000	1,613
Loan related fees	948	1,287
Bank owned life insurance	421	428
Other noninterest income	1,387	1,370
Total noninterest income	11,920	11,187
Noninterest expense:
Officer salaries and employee benefits	2,551	2,356
Other salaries and employee benefits	10,431	10,457
Occupancy, net	1,927	1,853
Equipment	978	918
Data processing	1,813	1,579
Bank franchise tax	1,123	1,155
Legal fees	606	601
Professional fees	382	260
FDIC insurance	602	657
Other real estate owned provision and expense	1,839	790
Other noninterest expense	4,047	5,124
Total noninterest expense	26,299	25,750
Income before income taxes	17,259	17,283
Income taxes	5,439	5,414
Net income	11,820	11,869
Unrealized holding gains on securities available-for-sale:
Unrealized holding gains arising during the period	(2,586)	(2,202)
Tax benefit	(905)	(771)
Other comprehensive income, net of tax	(1,681)	(1,431)
Comprehensive income	$ 10,139	$ 10,438
Basic earnings per share (in dollars per share)	$ 0.76	$ 0.77
Diluted earnings per share (in dollars per share)	$ 0.76	$ 0.77
Weighted average shares outstanding-basic (in shares)	15,539	15,407
Weighted average shares outstanding-diluted (in shares)	15,592	15,456
Dividends declared per share (in dollars per share)	$ 0.315	$ 0.310