Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
INTEREST INCOME:
Interest and fees on loans	$ 66,898	$ 68,425
Interest on securities:
Taxable	8,253	8,644
Nontaxable	5,191	3,510
Interest on federal funds sold	0	10
Interest on interest bearing deposits in other financial institutions	209	95
TOTAL INTEREST INCOME	80,551	80,684
INTEREST EXPENSE:
Interest on deposits	3,730	4,173
Interest on short-term borrowings	137	329
Interest on other borrowings (includes $397 and $506 of interest expense related to derivatives reclassified from accumulated other comprehensive income for the three months ended March 31, 2017 and 2016, respectively)	3,656	3,475
TOTAL INTEREST EXPENSE	7,523	7,977
NET INTEREST INCOME	73,028	72,707
Provision for loan losses	3,641	2,067
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	69,387	70,640
NONINTEREST INCOME:
Service charges and fees	9,457	7,162
Loan servicing income	1,724	1,268
Trust fees	3,631	3,813
Brokerage and insurance commissions	1,036	1,022
Securities gains, net (includes $2,482 and $3,756 of net security gains reclassified from accumulated other comprehensive income for the three months ended March 31, 2017 and 2016, respectively)	2,482	3,526
Net gains on sale of loans held for sale	6,147	11,065
Valuation allowance on commercial servicing rights	5	0
Income on bank owned life insurance	617	522
Other noninterest income	794	1,200
TOTAL NONINTEREST INCOME	25,893	29,578
NONINTEREST EXPENSES:
Salaries and employee benefits	41,767	41,714
Occupancy	5,073	5,003
Furniture and equipment	2,501	2,113
Professional fees	8,309	7,010
FDIC insurance assessments	807	1,168
Advertising	2,424	1,284
Core deposit intangibles and customer relationship intangibles amortization	1,171	1,895
Other real estate and loan collection expenses	828	572
Loss on sales/valuations of assets, net	412	313
Other noninterest expenses	8,448	9,237
TOTAL NONINTEREST EXPENSES	71,740	70,309
Income (loss) before taxes	23,540	29,909
Income taxes (includes $778 and $1,212 of income tax expense reclassified from accumulated other comprehensive income for the three months ended March 31, 2017 and 2016, respectively)	5,530	9,900
NET INCOME	18,010	20,009
Preferred dividends	(19)	(168)
Interest expense on convertible preferred debt	5	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 17,996	$ 19,841
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 0.68	$ 0.84
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	0.68	0.82
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.11	$ 0.10