BANK PREMISES AND EQUIPMENT (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total cost	$ 338,404,000	$ 323,944,000
Accumulated depreciation	(145,355,000)	(127,440,000)
Net bank premises and equipment	193,049,000	196,504,000
Depreciation expense	18,900,000	18,400,000	$ 12,500,000
Rental Income, Nonoperating	6,400,000	6,100,000	$ 890,000
Land [Member]
Property, Plant and Equipment [Line Items]
Total cost	52,844,000	52,844,000
Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 99,973,000	97,760,000
Bank Premises [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Bank Premises [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	40 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 50,682,000	47,098,000
Leasehold Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 102,251,000	93,450,000
Furniture and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year
Furniture and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Total cost	$ 32,654,000	$ 32,792,000
Machinery and Equipment | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years