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Investment Securities - Schedule of Carrying Value of Federal Home Loan Bank of Des Moines Stock and Federal Reserve Bank Stock (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investments Debt And Equity Securities [Abstract]    
Federal Home Loan Bank Stock $ 12,000 $ 12,000
Federal Reserve Bank Stock 21,401 21,340
Total $ 33,401 $ 33,340