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 and fees on loans and leases:
Taxable	$ 63,173	$ 65,479	$ 67,902
Exempt from federal income taxes	4,777	4,725	4,918
Total interest and fees on loans and leases	67,950	70,204	72,820
Interest and dividends on investment securities:
Taxable	5,432	5,951	8,063
Exempt from federal income taxes	4,071	4,335	4,469
Other interest income	126	164	116
Total interest income	77,579	80,654	85,468
Interest expense
Interest on demand deposits	478	686	939
Interest on savings deposits	313	790	1,468
Interest on time deposits	3,795	5,162	6,576
Interest on short-term borrowings	48	326	332
Interest on long-term borrowings	483	1,210	1,413
Total interest expense	5,117	8,174	10,728
Net interest income	72,462	72,480	74,740
Provision for loan and lease losses	11,228	10,035	17,479
Net interest income after provision for loan and lease losses	61,234	62,445	57,261
Noninterest income
Trust fee income	7,303	6,777	6,344
Service charges on deposit accounts	4,451	4,429	5,057
Investment advisory commission and fee income	6,817	5,363	5,373
Insurance commission and fee income	10,220	8,531	7,733
Other service fee income	7,390	5,855	5,240
Bank owned life insurance income	2,968	2,670	1,668
Other-than-temporary impairment on equity securities		(13)	(16)
Net gain on sales of investment securities	3,389	305	1,417
Net gain on mortgage banking activities	4,523	6,088	1,868
Net (loss) gain on dispositions and sales of fixed assets	(6)	1,257	(12)
Net gain (loss) on sales and write-downs of other real estate owned	626	(1,904)	(798)
Loss on termination of interest rate swap	(1,866)
Other	969	902	533
Total noninterest income	46,784	40,260	34,407
Noninterest expense
Salaries and benefits	39,522	37,306	33,124
Commissions	8,512	6,981	5,106
Net occupancy	5,869	5,716	5,782
Equipment	4,865	4,486	4,002
Marketing and advertising	1,948	1,725	1,760
Deposit insurance premiums	1,553	1,689	2,039
Restructuring charges	534
Other	18,330	18,379	16,197
Total noninterest expense	81,133	76,282	68,010
Income before income taxes	26,885	26,423	23,658
Income taxes	5,696	5,551	4,776
Net income	$ 21,189	$ 20,872	$ 18,882
Net income per share:
Basic	$ 1.28	$ 1.25	$ 1.13
Diluted	$ 1.27	$ 1.24	$ 1.13
Dividends declared	$ 0.80	$ 0.80	$ 0.80