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Accumulated Other Comprehensive Income (Loss) - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss)
Unrealized gain (loss) on investment securities available-for-sale	$ (11,487)	$ 8,779	$ 5,109
Net gain on the sale of investment securities available-for-sale		(918)	(23)
Other comprehensive income on available-for-sale debt securities	(11,487)	7,861	5,086
Amortization of actuarial loss (2)	301	218	227
Actuarial gain (loss)	1,808	(1,616)	412
Change in benefit plan liabilities	2,109	(1,398)	639
Net change in derivatives	(322)	315	441
Other comprehensive income (loss)	(9,700)	6,778	6,166
Income tax (benefit)	(2,037)	1,424	1,295
Other comprehensive income (loss)	$ (7,663)	$ 5,354	$ 4,871

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