CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
INTEREST INCOME:
Interest and fees on loans	$ 112,439	$ 106,414
Interest on securities:
Taxable	30,443	21,731
Nontaxable	4,503	2,183
Interest on federal funds sold	1	0
Interest on interest bearing deposits in other financial institutions	66	721
TOTAL INTEREST INCOME	147,452	131,049
INTEREST EXPENSE:
Interest on deposits	4,395	14,582
Interest on short-term borrowings	152	296
Interest on other borrowings (includes $(591) and $(183) of interest benefit related to derivatives reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020, respectively)	3,300	3,660
TOTAL INTEREST EXPENSE	7,847	18,538
NET INTEREST INCOME	139,605	112,511
Provision (benefit) for credit losses	(648)	21,520
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	140,253	90,991
NONINTEREST INCOME:
Revenue from contract with customers	20,301	17,776
Loan servicing income	838	963
Securities gains (losses), net (includes $(30) and $1,658 of net security gains (losses) reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020, respectively)	(30)	1,658
Unrealized loss on equity securities, net	(110)	(231)
Net gains on sale of loans held for sale	6,420	4,660
Valuation adjustment on servicing rights	917	(1,565)
Income on bank owned life insurance	829	498
Other noninterest income	1,152	2,058
TOTAL NONINTEREST INCOME	30,317	25,817
NONINTEREST EXPENSES:
Salaries and employee benefits	59,062	49,957
Occupancy	7,918	6,471
Furniture and equipment	3,093	3,108
Professional fees	13,490	12,473
Advertising	1,469	2,205
Core deposit intangibles and customer relationship intangibles amortization	2,516	2,981
Other real estate and loan collection expenses	135	334
Loss on sales/valuations of assets, net	194	16
Acquisition, integration and restructuring costs	2,928	1,376
Partnership investment in tax credit projects	35	184
Other noninterest expenses	11,583	11,754
TOTAL NONINTEREST EXPENSES	102,423	90,859
INCOME BEFORE INCOME TAXES	68,147	25,949
Income taxes (includes $143 and $466 of income tax expense reclassified from accumulated other comprehensive income for the three months ended March 31, 2021 and 2020, respectively)	15,333	5,909
NET INCOME	52,814	20,040
Preferred dividends	(2,013)	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 50,801	$ 20,040
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 1.20	$ 0.54
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	1.20	0.54
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.22	$ 0.20
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 13,671	$ 12,021
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	5,777	5,022
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	$ 853	$ 733