Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Loans, including fees	$ 524,060	$ 530,308	$ 540,667
Investment securities:
Taxable	45,279	50,651	54,321
Tax-exempt	7,879	8,977	9,475
Dividends	985	1,338	1,411
Loans held for sale	801	786	1,551
Other interest income	4,785	4,018	2,264
Total Interest Income	583,789	596,078	609,689
Interest Expense
Deposits	40,482	35,110	36,770
Short-term borrowings	372	1,608	2,420
Long-term debt	42,941	44,493	43,305
Total Interest Expense	83,795	81,211	82,495
Net Interest Income	499,994	514,867	527,194
Provision for credit losses	2,250	12,500	40,500
Net Interest Income After Provision for Credit Losses	497,744	502,367	486,694
Non-Interest Income
Service charges on deposit accounts	50,097	49,293	55,470
Investment management and trust services	44,056	44,605	41,706
Other service charges and fees	43,992	39,896	36,957
Mortgage banking income	18,208	17,107	30,656
Other	16,420	14,437	14,871
Investment securities gains (losses):
Net gains on sales of investment securities	9,066	2,071	8,128
Net other-than-temporary impairment losses	0	(30)	(124)
Investment securities gains, net	9,066	2,041	8,004
Total Non-Interest Income	181,839	167,379	187,664
Non-Interest Expense
Salaries and employee benefits	260,832	251,021	253,240
Net occupancy expense	47,777	48,130	46,944
Other outside services	27,785	28,404	18,856
Data processing	19,894	17,162	16,555
Software	14,746	12,758	11,560
Equipment expense	14,514	13,567	15,419
FDIC insurance expense	11,470	10,958	11,605
Professional fees	11,244	12,097	13,150
Supplies and postage	10,202	9,795	10,210
Marketing	7,324	8,133	7,705
Telecommunications	6,350	6,870	7,362
Loss on redemption of trust preferred securities	5,626	0	0
Other real estate owned and repossession expense	3,630	3,270	7,364
Operating risk loss	3,624	4,271	9,290
Intangible amortization	247	1,259	2,438
Other	34,895	31,551	29,735
Total Non-Interest Expense	480,160	459,246	461,433
Income Before Income Taxes	199,423	210,500	212,925
Income taxes	49,921	52,606	51,085
Net Income	$ 149,502	$ 157,894	$ 161,840
PER COMMON SHARE:
Net Income (Basic) (usd per share)	$ 0.85	$ 0.85	$ 0.84
Net Income (Diluted) (usd per share)	0.85	0.84	0.83
Cash Dividends (usd per share)	$ 0.38	$ 0.34	$ 0.32