Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest income
Loans	$ 78,703	$ 79,398	$ 79,049
Federal funds sold	295	320	255
Mortgage loans held for sale	219	344	231
Securities
Taxable	6,099	5,657	5,174
Tax-exempt	1,148	1,182	1,330
Total interest income	86,464	86,901	86,039
Interest expense
Deposits	5,011	7,166	10,105
Securities sold under agreements to repurchase	146	180	253
Federal funds purchased	32	31	38
Federal Home Loan Bank advances	887	2,461	1,460
Subordinated debentures	3,090	3,113	3,451
Total interest expense	9,166	12,951	15,307
Net interest income	77,298	73,950	70,732
Provision for loan losses	6,550	11,500	12,600
Net interest income after provision for loan losses	70,748	62,450	58,132
Non-interest income
Investment management and trust services	16,287	14,278	13,841
Service charges on deposit accounts	8,986	8,516	8,348
Bankcard transaction revenue	4,378	3,985	3,722
Mortgage banking revenue	3,978	5,771	3,049
Loss on sales of securities available for sale	(5)
Brokerage commissions and fees	2,159	2,593	2,219
Bank owned life insurance income	1,031	1,006	1,019
Gain on acquisition	449
Other	1,739	2,308	1,046
Total non-interest income	39,002	38,457	33,244
Non-interest expenses
Salaries and employee benefits	41,145	37,960	33,125
Net occupancy expense	5,615	5,651	5,192
Data processing expense	6,319	5,278	5,014
Furniture and equipment expense	1,126	1,306	1,299
FDIC insurance	1,431	1,494	1,655
Acquisition costs	1,548
Loss on other real estate owned	652	1,410	1,716
Other	13,516	12,373	11,580
Total non-interest expenses	71,352	65,472	59,581
Income before income taxes	38,398	35,435	31,795
Income tax expense	11,228	9,634	8,191
Net income	$ 27,170	$ 25,801	$ 23,604
Net income per share, basic (in dollars per share)	$ 1.91	$ 1.86	$ 1.71
Net income per share, diluted (in dollars per share)	$ 1.89	$ 1.85	$ 1.71