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INVESTMENT SECURITIES - Gains (losses) on sales of investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Sales of investment securities available-for-sale	$ 146,011,000	$ 54,023,000	$ 31,220,000
Gross gains	3,944,000	948,000	105,000
Gross losses	69,000	34,000	271,000
Sales of equity investments	543,000	4,622,000	5,968,000
Gross gains	5,000	3,501,000	0
Gross losses	0	0	7,000
Holding gain on equity securities	3,776,000	374,000	13,767,000
Securities held-to-maturity	0	0
Proceeds from sale of held-to-maturity securities	$ 0	$ 0	$ 0

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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