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	$ 61,007	$ 54,901	$ 170,290	$ 165,247
Interest and dividends on investment securities:
Taxable	7,259	7,660	22,208	23,377
Exempt from federal taxes	1,085	1,153	3,265	3,594
Interest on deposits in banks	374	207	830	717
Interest on federal funds sold	3	8	7	17
Total interest income	69,728	63,929	196,600	192,952
Interest expense:
Interest on deposits	3,487	3,821	10,238	12,214
Interest on securities sold under repurchase agreements	52	58	181	232
Interest on other borrowed funds	27	0	27	0
Interest on long-term debt	482	487	1,431	1,450
Interest on preferred stock pending redemption	0	0	0	159
Interest on subordinated debentures held by subsidiary trusts	598	607	1,778	1,904
Total interest expense	4,646	4,973	13,655	15,959
Net interest income	65,082	58,956	182,945	176,993
Provision for loan losses	261	(3,000)	(6,740)	(2,125)
Net interest income after provision for loan losses	64,821	61,956	189,685	179,118
Non-interest income:
Other service charges, commissions and fees	10,458	9,286	29,313	26,519
Income from the origination and sale of loans	7,346	7,934	18,386	28,652
Investment Advisory, Management and Administrative Fees	5,157	4,581	14,221	12,735
Service charges on deposit accounts	4,331	4,360	12,135	12,751
Investment securities gains, net	(8)	30	80	26
Other income	2,079	1,416	5,905	5,322
Total non-interest income	29,363	27,607	80,040	86,005
Non-interest expense:
Salaries and wages	25,914	22,806	72,796	69,681
Employee benefits	7,841	7,328	23,318	23,049
Occupancy, net	4,534	4,292	13,026	12,381
Furniture and equipment	3,338	3,147	9,696	9,362
Outsourced technology services	2,346	2,295	6,955	6,647
OREO expense, net of income	(58)	18	(211)	999
Professional fees	1,233	1,135	3,881	3,398
FDIC insurance premiums	1,172	1,205	3,381	3,938
Mortgage servicing rights amortization	591	629	1,774	2,187
Mortgage servicing rights impairment recovery	(61)	(62)	(117)	(121)
Core deposit intangibles amortization	688	355	1,396	1,064
Other expenses	12,368	9,431	33,672	31,699
Non-core acquisition expenses	5,052	0	5,649	0
Total non-interest expense	64,958	52,579	175,216	164,284
Income before income tax expense	29,226	36,984	94,509	100,839
Income tax expense	10,071	13,172	32,884	35,478
Net income	$ 19,155	$ 23,812	$ 61,625	$ 65,361
Basic earnings per common share	$ 0.43	$ 0.54	$ 1.39	$ 1.50
Diluted earnings per common share	$ 0.42	$ 0.54	$ 1.37	$ 1.49