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Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pre-Tax Amount
Other Comprehensive Income	$ 26,232	$ 14,537	$ (497)
Tax (Expense) Benefit
Other Comprehensive Income	(5,591)	(3,100)	106
Net of Tax Amount
Other comprehensive income (loss)	20,641	11,437	(391)
Accumulated Net Investment Gain (Loss) Attributable to Parent
Pre-Tax Amount
Net change in unrealized gains (losses) on debt securities available-for sale	22,683	15,793	(6,794)
Net available-for-sale securities (gains) losses reclassified into earnings	0	26	0
Tax (Expense) Benefit
Net change in unrealized gains (losses) on debt securities available-for sale	(4,827)	(3,367)	1,449
Net available-for-sale securities (gains) losses reclassified into earnings	0	(6)	0
Net of Tax Amount
Net change in unrealized gains (losses) on debt securities available-for sale	17,856	12,426	(5,345)
Net available-for-sale securities (gains) losses reclassified into earnings	0	20	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Pre-Tax Amount
Other Comprehensive Income	3,549	(1,282)	6,297
Tax (Expense) Benefit
Other Comprehensive Income	(764)	273	(1,343)
Net of Tax Amount
Other comprehensive income (loss)	$ 2,785	$ (1,009)	$ 4,954

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