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Investments - Debt and Short-term Investments (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Investment Holdings [Line Items]      
Other investments $ 50,413,000   $ 54,232,000
Investment in federal home loan bank stock us-gaap:AssetPledgedAsCollateralMember   us-gaap:AssetPledgedAsCollateralMember
Cash and Short-term Investments      
Cash $ 94,935,000   $ 62,217,000
FHLBC      
Investment Holdings [Line Items]      
Investments pledged as collateral 10,200,000    
Federal home loan bank borrowings fair value disclosure 0    
Investment In Low Income Housing Tax Credit Partnership Net Of Amortization      
Investment Holdings [Line Items]      
Other investments 19,400,000   20,300,000
Total tax benefit on investments in housing tax credit partnership 900,000 $ 900,000  
Qualified affordable housing project investments, commitment 2,700,000    
Investment in Private Funds      
Investment Holdings [Line Items]      
Other investments 27,800,000   $ 32,100,000
Fair value investments entities that calculate net asset value per share unfunded commitments $ 6,500,000