The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization		$ 2,480	$ 2,791	$ 4,959	$ 5,583
Core deposits
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method				accelerated basis
Estimated weighted average life (in years)				6 years 7 months 6 days
Customer lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method				straight-line basis
Estimated weighted average life (in years)				11 years
Finite-lived Intangible Assets Acquired	$ 39,400