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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted and New Accounting Pronouncements (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Recently Adopted Accounting Pronouncements [Abstract]
Retained earnings	$ 882,851	$ 960,183
Allowance for loan losses	49,911	60,869	$ 49,284
Loans	6,890,543	7,415,952
ASU 2016-13 [Member]
Recently Adopted Accounting Pronouncements [Abstract]
Allowance for loan losses	51,268	60,869
ASU 2016-13 [Member] | Cumulative Effect Adjustment [Member]
Recently Adopted Accounting Pronouncements [Abstract]
Retained earnings		1,100
Allowance for loan losses	(1,357)	(3,100)
Other liabilities		1,400
Increase in other operating liabilities		$ 600
Addition to allowance for credit losses	$ 3,100

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