CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Interest income:
Interest and fees on loans	$ 99,319	$ 98,070	$ 96,796
Interest on securities: Taxable	18,704	21,824	29,423
Interest on securities: Nontaxable	3,002	3,077	3,116
Dividends on corporate stock and Federal Home Loan Bank stock	252	198	245
Other interest income	69	85	50
Total interest income	121,346	123,254	129,630
Interest expense:
Deposits	15,692	20,312	32,638
Federal Home Loan Bank advances	18,158	22,786	28,172
Junior subordinated debentures	1,568	1,989	1,947
Other interest expense	973	976	981
Total interest expense	36,391	46,063	63,738
Net interest income	84,955	77,191	65,892
Provision for loan losses	4,700	6,000	8,500
Net interest income after provision for loan losses	80,255	71,191	57,392
Noninterest income:
Trust and investment advisory fees	22,532	20,670	18,128
Mutual fund fees	4,287	4,423	4,140
Financial planning, commissions and other service fees	1,487	1,299	1,518
Wealth management services	28,306	26,392	23,786
Service charges on deposit accounts	3,455	3,587	3,667
Merchant processing fees	9,905	9,156	7,844
Card interchange fees	2,249	1,975	1,628
Income from bank-owned life insurance	1,939	1,887	1,794
Net gains on loan sales and commissions on loans originated for others	5,074	4,052	4,352
Net realized gains on securities	698	729	314
Net gains (losses) on interest rate swap contracts	6	(36)	697
Equity in losses of unconsolidated subsidiaries	(213)	(337)	0
Other income	1,536	1,485	1,708
Noninterest income, excluding other-than-temporary impairment losses	52,955	48,890	45,790
Total other-than-temporary impairment losses on securities	(54)	(245)	(6,650)
Portion of loss recognized in other comprehensive income (before tax)	(137)	(172)	3,513
Net impairment losses recognized in earnings	(191)	(417)	(3,137)
Total noninterest income	52,764	48,473	42,653
Noninterest expense:
Salaries and employee benefits	51,095	47,429	41,917
Net occupancy	5,295	4,851	4,790
Equipment	4,344	4,099	3,917
Merchant processing costs	8,560	7,822	6,652
Outsourced services	3,530	3,304	3,169
FDIC deposit insurance costs	2,043	3,163	4,397
Legal, audit and professional fees	1,927	1,813	2,443
Advertising and promotion	1,819	1,633	1,687
Amortization of intangibles	951	1,091	1,209
Foreclosed property costs	878	841	72
Debt prepayment penalties	694	752	0
Other expenses	9,237	8,513	7,350
Total noninterest expense	90,373	85,311	77,603
Income before income taxes	42,646	34,353	22,442
Income tax expense	12,922	10,302	6,346
Net income	$ 29,724	$ 24,051	$ 16,096
Weighted average common shares outstanding - basic	16,254	16,114	15,995
Weighted average common shares outstanding - diluted	16,284	16,123	16,041
Per share information:
Basic earnings per common share	$ 1.82	$ 1.49	$ 1.01
Diluted earnings per common share	$ 1.82	$ 1.49	$ 1.00
Cash dividends declared per share	$ 0.88	$ 0.84	$ 0.84