Consolidated Statements of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INTEREST INCOME
Loans		$ 616,037	$ 352,351	$ 265,652
Interest bearing balances due from banks and federal funds sold		5,996	1,933	756
Investment securities		57,318	40,115	33,479
Mortgage loans held for sale		1,336	605	1,102
Assets held in trading accounts		0	0	16
TOTAL INTEREST INCOME		680,687	395,004	301,005
INTEREST EXPENSE
Deposits		87,210	27,756	15,217
Federal funds purchased and securities sold under agreements to repurchase		423	347	273
Other borrowings		23,654	8,621	4,148
Subordinated notes and debentures		16,848	3,350	2,161
TOTAL INTEREST EXPENSE		128,135	40,074	21,799
NET INTEREST INCOME		552,552	354,930	279,206
Provision for loan losses		38,148	26,393	20,065
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES		514,404	328,537	259,141
NON-INTEREST INCOME
Investment banking income		3,141	2,793	3,471
Bank owned life insurance income		4,415	3,503	3,324
Gain on sale of securities, net		61	1,059	5,848
Other income		19,863	19,268	18,788
TOTAL NON-INTEREST INCOME		143,896	138,765	139,382
NON-INTEREST EXPENSE
Salaries and employee benefits		216,743	154,314	133,457
Occupancy expense, net		29,610	21,159	18,667
Furniture and equipment expense		16,323	19,366	16,683
Other real estate and foreclosure expense		4,480	3,042	4,461
Deposit insurance		8,721	3,696	3,469
Merger related costs		4,777	21,923	4,835
Other operating expenses		111,575	88,879	73,513
TOTAL NON-INTEREST EXPENSE		392,229	312,379	255,085
INCOME BEFORE INCOME TAXES		266,071	154,923	143,438
Provision for income taxes		50,358	61,983	46,624
NET INCOME		215,713	92,940	96,814
Preferred stock dividends		0	0	24
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS		$ 215,713	$ 92,940	$ 96,790
Basic earnings per share (in dollars per share)	[1]	$ 2.34	$ 1.34	$ 1.58
Diluted earnings per share (in dollars per share)	[1]	$ 2.32	$ 1.33	$ 1.56
Trust income
NON-INTEREST INCOME
NON-INTEREST INCOME		$ 23,128	$ 18,570	$ 15,442
Service charges on deposit accounts
NON-INTEREST INCOME
NON-INTEREST INCOME		42,508	36,079	32,414
Other service charges and fees
NON-INTEREST INCOME
NON-INTEREST INCOME		7,469	9,919	12,872
Mortgage and SBA lending income
NON-INTEREST INCOME
NON-INTEREST INCOME		11,043	13,316	16,483
Debit and credit card fees
NON-INTEREST INCOME
NON-INTEREST INCOME		$ 32,268	$ 34,258	$ 30,740

[1] Per share amounts for the years ended 2017 and 2016 have been restated to reflect the effect of the two-for-one stock split on February 8, 2018.