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Income Taxes - Narrative (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Deferred tax assets (liabilities) related to net unrealized holdings losses/(gains) in the available-for-sale securities portfolio $ (1,300,000) $ 7,500,000
Deferred tax assets related to employee benefit plans 15,500,000 12,900,000
Valuation allowance 0 0
Unrecognized tax benefits $ 0 $ 0