CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest income:
Interest and fees on loans	$ 50,702	$ 45,094	$ 142,470	$ 134,618
Interest and dividends on taxable investments	14,278	11,928	41,147	35,029
Interest and dividends on nontaxable investments	5,438	5,575	16,938	16,625
Total interest income	70,418	62,597	200,555	186,272
Interest expense:
Interest on deposits	6,887	7,296	19,684	23,646
Interest on borrowings	7,466	7,468	22,146	22,617
Interest on subordinated debt held by unconsolidated subsidiary trusts	1,497	1,509	4,447	4,458
Total interest expense	15,850	16,273	46,277	50,721
Net interest income	54,568	46,324	154,278	135,551
Less: provision for loan losses	1,043	1,400	3,143	5,270
Net interest income after provision for loan losses	53,525	44,924	151,135	130,281
Noninterest income:
Deposit service fees	11,134	11,180	31,307	33,036
Mortgage banking and other services	1,499	2,078	3,920	4,116
Benefit plan administration, consulting and actuarial fees	7,685	7,256	23,722	22,415
Wealth management services	2,904	2,400	7,866	7,442
Gain (loss) on investment securities & debt extinguishments, net	(6)	0	8	0
Total noninterest income	23,216	22,914	66,823	67,009
Operating expenses:
Salaries and employee benefits	26,543	23,056	75,185	68,501
Occupancy and equipment	6,103	5,575	18,413	17,414
Data processing and communications	5,330	5,430	15,278	15,853
Amortization of intangible assets	1,161	1,277	3,251	4,985
Legal and professional fees	1,640	1,014	4,286	3,819
Office supplies and postage	1,300	1,382	3,873	3,942
Business development and marketing	1,096	1,250	4,534	3,995
Acquisition expenses and special charges	381	57	4,689	256
Other	4,539	5,311	13,026	14,000
Total operating expenses	48,093	44,352	142,535	132,765
Income before income taxes	28,648	23,486	75,423	64,525
Income taxes	8,640	6,224	21,269	17,099
Net income	$ 20,008	$ 17,262	$ 54,154	$ 47,426
Basic earnings per share (in dollars per share)	$ 0.54	$ 0.52	$ 1.52	$ 1.43
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.51	$ 1.50	$ 1.42
Dividends declared per share (in dollars per share)	$ 0.26	$ 0.24	$ 0.74	$ 0.70