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INVESTMENT SECURITIES - Proceeds from Sales of AFS Securities and Gross Gains and Gross Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Proceeds from sale of investment securities	$ 0	$ 25,575	$ 0	$ 199,411
Gross gains	0	2,328	0	4,956
Gross losses	13	0	44	225
Debt Securities, Available-for-sale [Line Items]
Gain on investments		$ 2,300		$ 4,700
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
AFS securities pledged to secure public funds, fair value	$ 426,100		$ 426,100		$ 158,700

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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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