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COMPREHENSIVE INCOME - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Comprehensive Income
Gain (loss) on sale of available-for-sale securities, net									$ 3,875	$ 914	$ (166)
Salaries and employee benefits									(60,210)	(61,629)	(56,175)
Interest on investment securities									2,405	2,448	3,055
Income from continuing operations, before income taxes									48,578	46,943	35,014
Income tax expense									(9,882)	(9,532)	(8,450)
Net income	$ 9,959	$ 11,828	$ 9,247	$ 8,085	$ 11,838	$ 6,491	$ 18,034	$ 1,048	39,121	37,411	26,991
Amount Reclassified from AOCI
Comprehensive Income
Net income									1,950	723	(352)
Available-for-sale securities | Amount Reclassified from AOCI
Comprehensive Income
Gain (loss) on sale of available-for-sale securities, net									3,875	914	(166)
Income from continuing operations, before income taxes									3,875	914	(166)
Income tax expense									(908)	(214)	44
Net income									2,967	700	(122)
Defined benefit pension plan items | Amount Reclassified from AOCI
Comprehensive Income
Salaries and employee benefits									(507)	(420)	(271)
Income from continuing operations, before income taxes									(507)	(420)	(271)
Income tax expense									119	98	73
Net income									(388)	(322)	(198)
Investment hedge | Amount Reclassified from AOCI
Comprehensive Income
Interest on investment securities									(862)	473	(44)
Income from continuing operations, before income taxes									(862)	473	(44)
Income tax expense									233	(128)	12
Net income									$ (629)	$ 345	$ (32)

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