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SECURITIES - Available-for-sale Securities With Unrealized Loss Positions (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	$ 166,244	$ 26,058
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(2,335)	(69)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	2,200	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(84)	0
Available-for-sale securities with unrealized loss positions, fair value	168,444	26,058
Available-for-sale securities, with unrealized loss positions, unrealized losses	(2,419)	(69)
Obligations of the U.S. Treasury
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	11,001	9,159
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(80)	(2)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	0	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	0	0
Available-for-sale securities with unrealized loss positions, fair value	11,001	9,159
Available-for-sale securities, with unrealized loss positions, unrealized losses	(80)	(2)
Obligations of U.S. Government agencies
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	12,210	4,992
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(289)	(8)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	0	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	0	0
Available-for-sale securities with unrealized loss positions, fair value	12,210	4,992
Available-for-sale securities, with unrealized loss positions, unrealized losses	(289)	(8)
Obligations Of States And Political Subdivisions Tax Exempt
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	41,145	3,811
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(508)	(26)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	0	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	0	0
Available-for-sale securities with unrealized loss positions, fair value	41,145	3,811
Available-for-sale securities, with unrealized loss positions, unrealized losses	(508)	(26)
Obligations Of States And Political Subdivisions Taxable
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	25,561	5,235
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(365)	(24)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	2,200	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(84)	0
Available-for-sale securities with unrealized loss positions, fair value	27,761	5,235
Available-for-sale securities, with unrealized loss positions, unrealized losses	(449)	(24)
Residential Passthrough Securities
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	36,651
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(269)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	0
Available-for-sale securities with unrealized loss positions, fair value	36,651
Available-for-sale securities, with unrealized loss positions, unrealized losses	(269)
Residential Collateralized Mortgage Obligations
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	4,745	2,861
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(38)	(9)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	0	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	0	0
Available-for-sale securities with unrealized loss positions, fair value	4,745	2,861
Available-for-sale securities, with unrealized loss positions, unrealized losses	(38)	$ (9)
Commercial Mortgage Backed Securities
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	34,931
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(786)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	0
Available-for-sale securities with unrealized loss positions, fair value	34,931
Available-for-sale securities, with unrealized loss positions, unrealized losses	$ (786)

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