CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest income:
Interest and fees on loans	$ 46,073	$ 46,412	$ 91,766	$ 93,530
Interest and dividends on taxable investments	12,772	12,566	25,242	27,782
Interest and dividends on nontaxable investments	5,264	5,162	10,340	10,753
Total interest income	64,109	64,140	127,348	132,065
Interest expense:
Interest on deposits	2,068	2,703	4,303	5,845
Interest on borrowings	254	2,375	537	8,105
Interest on subordinated debt held by unconsolidated subsidiary trusts	617	630	1,229	1,258
Total interest expense	2,939	5,708	6,069	15,208
Net interest income	61,170	58,432	121,279	116,857
Provision for loan losses	1,900	1,321	2,900	2,714
Net interest income after provision for loan losses	59,270	57,111	118,379	114,143
Noninterest income:
Deposit service fees	13,172	12,345	25,427	23,940
Other banking services	1,608	1,020	2,798	2,058
Employee benefit services	10,448	9,397	20,883	19,167
Wealth management services	4,438	4,045	8,912	7,743
Gain on sales of investment securities	0	16,008	0	63,799
Loss on debt extinguishments	0	(15,717)	0	(63,500)
Total noninterest income	29,666	27,098	58,020	53,207
Noninterest expenses:
Salaries and employee benefits	30,409	30,286	61,149	60,769
Occupancy and equipment	6,916	6,750	14,608	13,815
Data processing and communications	7,251	6,600	14,054	13,336
Amortization of intangible assets	1,101	1,140	2,242	2,319
Legal and professional fees	1,507	1,526	3,454	3,466
Office supplies and postage	1,647	1,518	3,198	3,013
Business development and marketing	1,930	1,804	3,660	3,283
FDIC insurance premiums	947	945	1,966	2,000
Acquisition expenses	0	0	123	5
Other	3,456	3,807	6,632	6,922
Total noninterest expenses	55,164	54,376	111,086	108,928
Income before income taxes	33,772	29,833	65,313	58,422
Income taxes	10,096	8,711	19,463	17,059
Net income	$ 23,676	$ 21,122	$ 45,850	$ 41,363
Basic earnings per share (in dollars per share)	$ 0.58	$ 0.53	$ 1.13	$ 1.03
Diluted earnings per share (in dollars per share)	$ 0.57	$ 0.52	$ 1.11	$ 1.02
Cash dividends declared per share (in dollars per share)	$ 0.28	$ 0.27	$ 0.56	$ 0.54