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LOANS - Pledged, Purchased credit impaired, Accretable yield (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
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 2,708,691		$ 2,708,691		$ 2,641,092
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule
Balance at beginning of period	6,227	$ 4,195	7,367	$ 4,377
Net reclassifications from (to) nonaccretable difference	53	(126)	1,004	498
Accretion	(455)	(581)	(2,546)	(1,387)
Balance at end of period	5,825	$ 3,488	5,825	$ 3,488
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 651,845		$ 651,845		$ 805,862

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Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of reclassification (to) from nonaccretable difference (from) to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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