PARENT COMPANY ONLY FINANCIAL INFORMATION (Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets:
Cash and interest-bearing deposits	$ 323,013	$ 363,087
Other assets	574,772	496,008
TOTAL ASSETS	19,411,707	20,244,228
Liabilities and Stockholders’ equity:
Accrued expenses and other liabilities	282,225	248,294
TOTAL LIABILITIES	17,478,590	18,509,173
Stockholders’ equity:
Common stock	42,688	42,467
Capital surplus	1,090,740	1,080,964
Retained earnings	1,141,501	1,120,925
Accumulated other comprehensive loss	(452,517)	(620,006)
TOTAL STOCKHOLDERS' EQUITY	1,933,117	1,735,055	$ 2,182,178	$ 2,079,231
TOTAL LIABILITIES AND EQUITY	19,411,707	20,244,228
Parent
Assets:
Cash and interest-bearing deposits	288,203	307,026
Investment in subsidiaries	1,971,014	1,747,188
Other assets	72,501	94,953
TOTAL ASSETS	2,331,718	2,149,167
Liabilities and Stockholders’ equity:
Borrowings	372,316	370,930
Accrued expenses and other liabilities	26,285	43,182
TOTAL LIABILITIES	398,601	414,112
Stockholders’ equity:
Preferred stock	110,705	110,705
Common stock	42,688	42,467
Capital surplus	1,090,740	1,080,964
Retained earnings	1,141,501	1,120,925
Accumulated other comprehensive loss	(452,517)	(620,006)
TOTAL STOCKHOLDERS' EQUITY	1,933,117	1,735,055
TOTAL LIABILITIES AND EQUITY	$ 2,331,718	$ 2,149,167