CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income:
Interest and fees on loans	$ 46,883	$ 47,606	$ 138,649	$ 141,136
Interest and dividends on taxable investments	12,239	13,394	37,481	41,176
Interest and dividends on nontaxable investments	5,165	5,132	15,505	15,885
Total interest income	64,287	66,132	191,635	198,197
Interest expense:
Interest on deposits	1,962	2,530	6,265	8,375
Interest on borrowings	308	2,368	846	10,473
Interest on subordinated debt held by unconsolidated subsidiary trusts	623	633	1,852	1,891
Total interest expense	2,893	5,531	8,963	20,739
Net interest income	61,394	60,601	182,672	177,458
Provision for loan losses	1,747	2,093	4,647	4,807
Net interest income after provision for loan losses	59,647	58,508	178,025	172,651
Noninterest income:
Deposit service fees	13,833	12,703	39,260	36,643
Other banking services	1,867	1,671	4,665	3,729
Employee benefit services	10,755	9,397	31,638	28,564
Wealth management services	4,617	3,823	13,529	11,566
Gain on sales of investment securities	0	0	0	63,799
Loss on debt extinguishments	0	0	0	(63,500)
Total noninterest income	31,072	27,594	89,092	80,801
Noninterest expenses:
Salaries and employee benefits	30,941	30,448	92,090	91,217
Occupancy and equipment	6,617	6,448	21,224	20,263
Data processing and communications	7,475	6,998	21,529	20,334
Amortization of intangible assets	1,051	1,089	3,293	3,408
Legal and professional fees	1,973	1,897	5,427	5,363
Office supplies and postage	1,466	1,566	4,664	4,579
Business development and marketing	1,764	1,973	5,424	5,256
FDIC insurance premiums	952	923	2,918	2,923
Acquisition expenses and litigation settlement	2,800	71	2,923	76
Other	3,772	3,631	10,404	10,553
Total noninterest expenses	58,811	55,044	169,896	163,972
Income before income taxes	31,908	31,058	97,221	89,480
Income taxes	9,537	9,069	29,001	26,128
Net income	$ 22,371	$ 21,989	$ 68,220	$ 63,352
Basic earnings per share (in dollars per share)	$ 0.55	$ 0.55	$ 1.67	$ 1.58
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.54	$ 1.65	$ 1.56
Cash dividends declared per share (in dollars per share)	$ 0.30	$ 0.28	$ 0.86	$ 0.82