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Federal Home Loan Bank and Federal Reserve Bank Stock - Summary of FHLB and FRB Stocks (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Federal Home Loan Banks [Abstract]    
FHLB stock, at cost $ 234,455 $ 196,457
FRB stock, at cost 123,959 123,979
Total investments $ 358,414 $ 320,436