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Investments in Qualified Affordable Housing (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investment [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments $ 56,024 $ 53,070  
Affordable Housing Program Obligation 29,298 25,894  
Amortization Method Qualified Affordable Housing Project Investments, Amortization 7,046 6,927 $ 7,322
Affordable Housing Tax Credits and Other Tax Benefits, Amount 8,700 8,800 $ 9,000
Qualified Affordable Housing [Domain]      
Investment [Line Items]      
Amortization Method Qualified Affordable Housing Project Investments $ 56,024 $ 53,070