GOODWILL AND INTANGIBLE ASSETS (Information Concerning Intangible Assets with Finite Life) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Total estimated amortization expense	$ 43,312,000
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	101,724,000	$ 135,300,000
Accumulated Amortization	66,739,000	88,109,000
Total estimated amortization expense	34,985,000	47,191,000
Other amortizable intangibles
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	14,893,000	15,240,000
Accumulated Amortization	6,566,000	5,246,000
Total estimated amortization expense	$ 8,327,000	$ 9,994,000