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Qualified Affordable Housing Project Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Federal Home Loan Banks [Abstract]          
Amortization Method Qualified Affordable Housing Project Investments $ 3,100   $ 3,100   $ 3,300
Qualified Affordable Housing Project Investments, Commitment 1,200   1,200   $ 1,900
Amortization Method Qualified Affordable Housing Project Investments, Amortization 58 $ 43 115 $ 86  
Affordable Housing Tax Credits and Other Tax Benefits Expected to Be Received     385    
Affordable Housing Tax Credits and Other Tax Benefits, Amount $ 96 $ 75 $ 191 $ 150