Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
INTEREST INCOME
Interest and fees on loans	$ 159,656	$ 151,945
Interest and dividends on investment securities:
Taxable	25,516	25,092
Tax exempt	7,830	7,887
Other interest	1,067	1,692
Total interest income	194,069	186,616
INTEREST EXPENSE
Interest on deposits	11,766	7,619
Interest on Federal funds purchased and securities sold under agreements to repurchase	296	231
Interest on other short-term funding	515	81
Interest on long-term funding	9,505	10,872
Total interest expense	22,082	18,803
NET INTEREST INCOME	171,987	167,813
Provision for credit losses	20,000	4,500
Net interest income after provision for credit losses	151,987	163,313
NONINTEREST INCOME
Trust service fees	11,447	12,087
Service charges on deposit accounts	16,273	15,806
Card-based and other nondeposit fees	11,991	12,416
Insurance commissions	21,382	19,728
Brokerage and annuity commissions	3,794	3,683
Mortgage banking, net	4,204	7,408
Capital market fees, net	3,538	2,467
Bank owned life insurance income	4,770	2,875
Asset gains, net	524	833
Investment securities gains, net	3,098	0
Other	2,171	2,510
Total noninterest income	83,192	79,813
NONINTEREST EXPENSE
Personnel expense	101,398	100,152
Occupancy	13,802	17,683
Equipment	5,446	5,772
Technology	14,264	15,558
Business development and advertising	8,211	5,327
Other intangible amortization	504	801
Loan expense	3,221	2,996
Legal and professional fees	5,025	4,538
Foreclosure / OREO expense	1,877	1,162
FDIC expense	7,750	6,500
Other	12,473	13,503
Total noninterest expense	173,971	173,992
Income before income taxes	61,208	69,134
Income tax expense	18,674	22,462
Net income	42,534	46,672
Preferred stock dividends	2,198	1,228
Net income available to common equity	$ 40,336	$ 45,444
Earnings per common share:
Basic (in usd per share)	$ 0.27	$ 0.30
Diluted (in usd per share)	$ 0.27	$ 0.30
Average common shares outstanding:
Basic (in shares)	148,601	150,070
Diluted (in shares)	149,454	151,164