CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
INTEREST INCOME:
Interest and fees on loans	$ 100,456	$ 85,651
Interest on securities:
Taxable	15,876	11,577
Nontaxable	3,093	3,579
Interest on federal funds sold	4	0
Interest on interest bearing deposits in other financial institutions	1,292	407
TOTAL INTEREST INCOME	120,721	101,214
INTEREST EXPENSE:
Interest on deposits	13,213	5,766
Interest on short-term borrowings	889	268
Interest on other borrowings (includes $165 and $197 of interest expense related to derivatives reclassified from accumulated other comprehensive income for the three months ended March 31, 2019 and 2018, respectively)	3,664	3,596
TOTAL INTEREST EXPENSE	17,766	9,630
NET INTEREST INCOME	102,955	91,584
Provision for loan losses	1,635	4,263
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	101,320	87,321
NONINTEREST INCOME:
Revenue from contract with customers	18,002	15,666
Loan servicing income	1,729	1,754
Securities gains, net (includes $1,575 and $1,441 of net security gains reclassified from accumulated other comprehensive income for the three months ended March 31, 2019 and 2018, respectively)	1,575	1,441
Unrealized gain/(loss) on equity securities, net	258	(28)
Net gains on sale of loans held for sale	3,176	4,051
Servicing Rights Impairment (Recovery)	(589)	(2)
Income on bank owned life insurance	899	614
Other noninterest income	1,667	1,220
TOTAL NONINTEREST INCOME	26,717	24,716
NONINTEREST EXPENSES:
Salaries and employee benefits	50,285	48,710
Occupancy	6,607	6,043
Furniture and equipment	2,692	2,749
Professional fees	11,379	9,448
Advertising	2,325	1,940
Core deposit intangibles and customer relationship intangibles amortization	2,842	1,863
Other real estate and loan collection expenses	701	732
Gain on sales/valuations of assets, net	(3,004)	(197)
Restructuring expenses	3,227	2,564
Other noninterest expenses	11,176	9,794
TOTAL NONINTEREST EXPENSES	88,230	83,646
INCOME BEFORE INCOME TAXES	39,807	28,391
Income taxes (includes $358 and $261 of income tax expense reclassified from accumulated other comprehensive income for the three months ended March 31, 2019 and 2018, respectively)	8,310	5,123
NET INCOME	31,497	23,268
Preferred dividends	0	(13)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 31,497	$ 23,255
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 0.91	$ 0.76
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	0.91	0.76
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.16	$ 0.13
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 12,794	$ 10,079
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	4,474	4,680
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	$ 734	$ 907