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Basis of Accounting and Consolidation - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (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
Accumulated Other Comprehensive Income Loss [Line Items]
Realized gains on available-for-sale securities									$ 124	$ 1,106	$ 802
Income Tax Expense Benefit	$ (5,168)	$ (6,105)	$ (3,357)	$ (668)	$ (4,484)	$ (3,720)	$ (3,096)	$ (3,172)	(15,298)	(14,472)	(15,323)
Total reclassifications out of accumulated other comprehensive income									88	785	569
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Realized gains on available-for-sale securities									124	1,106	802
Income Tax Expense Benefit									$ (36)	$ (321)	$ (233)

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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