Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Loans and leases, including fees	$ 482,086	$ 449,502	$ 390,983
Securities:
Taxable	58,148	53,877	43,504
Nontaxable	6,405	5,282	5,667
Dividends	39	228	103
Other	117	94	129
Total Interest Income	546,795	508,983	440,386
Interest Expense
Deposits	31,207	29,603	29,441
Short-term borrowings	7,075	5,638	4,423
Long-term borrowings	10,291	7,445	10,480
Total Interest Expense	48,573	42,686	44,344
Net Interest Income	498,222	466,297	396,042
Provision for credit losses	40,441	38,648	31,090
Net Interest Income After Provision for Credit Losses	457,781	427,649	364,952
Non-Interest Income
Impairment losses on securities			(27)
Net impairment losses on securities			(27)
Service charges	70,698	68,267	68,221
Trust	20,934	19,365	16,751
Insurance commissions and fees	16,270	16,758	16,598
Securities commissions and fees	13,642	11,453	11,286
Net securities gains	822	11,717	808
Mortgage banking operations	8,619	3,705	3,452
Bank owned life insurance	8,010	7,716	6,874
Other	23,415	19,293	11,815
Total Non-Interest Income	162,410	158,274	135,778
Non-Interest Expense
Salaries and employee benefits	202,068	195,016	179,971
Net occupancy	33,670	32,281	26,474
Equipment	31,869	29,245	25,214
Amortization of intangibles	8,305	9,717	8,407
Outside services	34,698	33,208	30,257
FDIC insurance	12,888	13,258	10,192
Supplies	8,064	7,102	6,887
State taxes	8,139	6,954	4,256
Telephone	6,234	5,710	5,063
Advertising and promotional	8,396	7,824	6,349
Loan related	6,161	4,933	3,945
Other real estate owned	4,637	4,401	3,215
Merger and acquisition related	3,033	9,611	8,210
Other	22,387	19,993	19,730
Total Non-Interest Expense	390,549	379,253	338,170
Income Before Income Taxes	229,642	206,670	162,560
Income taxes	69,993	62,620	44,756
Net Income	159,649	144,050	117,804
Preferred stock dividends	8,041	8,352
Net Income Available to Common Stockholders	$ 151,608	$ 135,698	$ 117,804
Net Income per Common Share
Basic	$ 0.87	$ 0.81	$ 0.81
Diluted	0.86	0.80	0.80
Cash Dividends Paid per Common Share	$ 0.48	$ 0.48	$ 0.48