CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Interest income:
Interest and fees on loans	$ 46,412	$ 47,077	$ 93,530	$ 94,715
Interest and dividends on taxable investments	12,566	17,450	27,782	31,725
Interest and dividends on nontaxable investments	5,162	6,018	10,753	11,616
Total interest income	64,140	70,545	132,065	138,056
Interest expense:
Interest on deposits	2,703	4,380	5,845	9,889
Interest on borrowings	2,375	7,713	8,105	15,113
Interest on subordinated debt held by unconsolidated subsidiary trusts	630	681	1,258	1,374
Total interest expense	5,708	12,774	15,208	26,376
Net interest income	58,432	57,771	116,857	111,680
Provision for loan losses	1,321	2,155	2,714	3,799
Net interest income after provision for loan losses	57,111	55,616	114,143	107,881
Noninterest income:
Deposit service fees	12,345	11,035	23,940	21,404
Other banking services	1,020	896	2,058	1,890
Benefit trust, administration, consulting and actuarial fees	9,397	8,664	19,167	17,637
Wealth management services	4,045	3,101	7,743	6,233
Gain on sales of investment securities	16,008	0	63,799	0
Loss on debt extinguishments	(15,717)	0	(63,500)	0
Total noninterest income	27,098	23,696	53,207	47,164
Noninterest expenses:
Salaries and employee benefits	30,286	26,844	60,769	54,269
Occupancy and equipment	6,750	6,130	13,815	12,593
Data processing and communications	6,600	5,817	13,336	11,417
Amortization of intangible assets	1,140	1,045	2,319	2,131
Legal and professional fees	1,526	1,755	3,466	3,946
Office supplies and postage	1,518	1,382	3,013	2,850
Business development and marketing	1,804	1,876	3,283	3,048
FDIC insurance premiums	945	903	2,000	1,809
Acquisition expenses	0	164	0	424
Other	3,807	3,454	6,927	6,286
Total noninterest expenses	54,376	49,370	108,928	98,773
Income before income taxes	29,833	29,942	58,422	56,272
Income taxes	8,711	8,871	17,059	16,375
Net income	$ 21,122	$ 21,071	$ 41,363	$ 39,897
Basic earnings per share (in dollars per share)	$ 0.53	$ 0.53	$ 1.03	$ 1.02
Diluted earnings per share (in dollars per share)	$ 0.52	$ 0.53	$ 1.02	$ 1.01