INVESTMENT SECURITIES - Gross Unrealized Gains (Losses) and Fair Value by Investment Category and Length of Time (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Mortgage-backed securities
Investment securities
Fair value, less than twelve months	$ 1,747
Gross unrealized losses, less than twelve months	(5)
Fair value, twelve months or greater	0
Gross unrealized losses, twelve months or greater	0
Fair value, total	1,747
Gross unrealized losses, total	(5)
State and political securities
Investment securities
Fair value, less than twelve months	34,203	$ 12,311
Gross unrealized losses, less than twelve months	(398)	(51)
Fair value, twelve months or greater	7,408	900
Gross unrealized losses, twelve months or greater	(296)	(8)
Fair value, total	41,611	13,211
Gross unrealized losses, total	(694)	(59)
Other debt securities
Investment securities
Fair value, less than twelve months	21,446	5,964
Gross unrealized losses, less than twelve months	(301)	(74)
Fair value, twelve months or greater	1,808	4,429
Gross unrealized losses, twelve months or greater	(20)	(133)
Fair value, total	23,254	10,393
Gross unrealized losses, total	(321)	(207)
Total debt securities
Investment securities
Fair value, less than twelve months	57,396	18,275
Gross unrealized losses, less than twelve months	(704)	(125)
Fair value, twelve months or greater	9,216	5,329
Gross unrealized losses, twelve months or greater	(316)	(141)
Fair value, total	66,612	23,604
Gross unrealized losses, total	$ (1,020)	$ (266)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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