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SECURITIES AVAILABLE FOR SALE - Proceeds from Sales of AFS Securities and Gross Gains and Gross Losses (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of AFS securities		$ 114,871	$ 25,533	$ 174,335	$ 88,110
Gross gains		2,109	211	2,628	1,052
Gross losses		45	165	225	190
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales of AFS securities		114,871	$ 25,533	174,335	$ 88,110
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
AFS securities pledged to secure public funds, fair value		$ 176,270		$ 176,270		$ 164,233
Subsequent Event
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of AFS securities	$ 18,000
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales of AFS securities	18,000
Net Gain on AFS securities	$ 2,300

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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).

+ References

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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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