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SECURITIES AVAILABLE FOR SALE - Proceeds from Sales of AFS Securities and Gross Gains and Gross Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of AFS securities	$ 25,575	$ 25,070	$ 199,910	$ 113,180
Gross gains	2,328	185	4,956	1,237
Gross losses	0	$ 156	225	$ 346
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
AFS securities pledged to secure public funds, fair value	$ 161,627		$ 161,627		$ 164,233

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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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Amount of cash inflow from sale of 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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