Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest Income
Interest and fees on loans	$ 175,014	$ 166,071
Interest and dividends on investment securities:
Taxable	17,589	13,999
Tax-exempt	4,031	3,690
Dividends	2,151	1,480
Interest on federal funds sold and other short-term investments	331	357
Total interest income	199,116	185,597
Interest on deposits:
Savings, NOW and money market	10,183	9,243
Time	9,553	9,585
Interest on short-term borrowings	3,901	1,872
Interest on long-term borrowings and junior subordinated debentures	12,950	16,744
Total interest expense	36,587	37,444
Net Interest Income	162,529	148,153
Provision for credit losses	2,470	800
Net Interest Income After Provision for Credit Losses	160,059	147,353
Non-Interest Income
Trust and investment services	2,744	2,440
Insurance commissions	5,061	4,708
Service charges on deposit accounts	5,236	5,103
(Losses) gains on securities transactions, net	(23)	271
Fees from loan servicing	1,815	1,594
Gains on sales of loans, net	4,128	1,795
Bank owned life insurance	2,463	1,963
Other	3,635	3,574
Total non-interest income	25,059	21,448
Non-Interest Expense
Salary and employee benefits expense	63,716	60,259
Net occupancy and equipment expense	23,035	22,789
FDIC insurance assessment	5,127	5,099
Amortization of other intangible assets	2,536	2,849
Professional and legal fees	4,695	3,895
Amortization of tax credit investments	5,324	7,264
Telecommunication expense	2,659	2,386
Other	13,860	13,684
Total non-interest expense	120,952	118,225
Income Before Income Taxes	64,166	50,576
Income tax expense	18,071	14,389
Net Income	46,095	36,187
Dividends on preferred stock	1,797	1,797
Net Income Available to Common Shareholders	$ 44,298	$ 34,390
Earnings Per Common Share:
Basic (usd per share)	$ 0.17	$ 0.14
Diluted (usd per share)	0.17	0.14
Cash Dividends Declared per Common Share (usd per share)	$ 0.11	$ 0.11
Weighted Average Number of Common Shares Outstanding:
Basic (in shares)	263,797,024	254,075,349
Diluted (in shares)	264,546,266	254,347,420