Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
INTEREST INCOME
Loans	$ 187,566	$ 159,440
Interest bearing balances due from banks and federal funds sold	2,441	2,154
Investment securities	18,943	16,281
Mortgage loans held for sale	281	210
TOTAL INTEREST INCOME	209,231	178,085
INTEREST EXPENSE
Deposits	31,277	30,750
Federal funds purchased and securities sold under agreements to repurchase	759	136
Other borrowings	4,877	6,793
Subordinated notes and debentures	4,835	4,411
TOTAL INTEREST EXPENSE	41,748	42,090
NET INTEREST INCOME	167,483	135,995
Provision for credit loss expense	26,134	9,285
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	141,349	126,710
NON-INTEREST INCOME
Investment banking income	877	618
Bank owned life insurance income	1,298	795
Gain on sale of securities, net	32,095	2,740
Other income	12,801	4,156
TOTAL NON-INTEREST INCOME	82,394	34,792
NON-INTEREST EXPENSE
Salaries and employee benefits	67,924	56,367
Occupancy expense, net	9,510	7,475
Furniture and equipment expense	5,723	3,358
Other real estate and foreclosure expense	325	637
Deposit insurance	2,475	2,040
Merger related costs	1,068	1,470
Other operating expenses	38,788	30,062
TOTAL NON-INTEREST EXPENSE	125,813	101,409
INCOME BEFORE INCOME TAXES	97,930	60,093
Provision for income taxes	20,694	12,398
NET INCOME	77,236	47,695
Preferred stock dividends	13	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 77,223	$ 47,695
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.68	$ 0.52
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.68	$ 0.51
Trust income
NON-INTEREST INCOME
Non-interest income	$ 7,151	$ 5,708
Service charges on deposit accounts
NON-INTEREST INCOME
Non-interest income	13,328	10,068
Other service charges and fees
NON-INTEREST INCOME
Non-interest income	1,588	1,289
Mortgage lending income
NON-INTEREST INCOME
Non-interest income	5,046	2,823
SBA lending income
NON-INTEREST INCOME
Non-interest income	296	497
Debit and credit card fees
NON-INTEREST INCOME
Non-interest income	$ 7,914	$ 6,098