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Securities - Credit Quality Indicator (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Securities Financing Transaction [Line Items]  
Carrying value $ 334,532
Investment Grade  
Securities Financing Transaction [Line Items]  
Carrying value 320,256
Non-Investment Grade/Non-rated  
Securities Financing Transaction [Line Items]  
Carrying value 14,276
State, municipal and sovereign debt obligations  
Securities Financing Transaction [Line Items]  
Carrying value 254,311
State, municipal and sovereign debt obligations | Investment Grade  
Securities Financing Transaction [Line Items]  
Carrying value 254,311
State, municipal and sovereign debt obligations | Non-Investment Grade/Non-rated  
Securities Financing Transaction [Line Items]  
Carrying value 0
Corporate debt securities  
Securities Financing Transaction [Line Items]  
Carrying value 54,930
Corporate debt securities | Investment Grade  
Securities Financing Transaction [Line Items]  
Carrying value 40,654
Corporate debt securities | Non-Investment Grade/Non-rated  
Securities Financing Transaction [Line Items]  
Carrying value 14,276
Non-agency commercial MBS  
Securities Financing Transaction [Line Items]  
Carrying value 25,291
Non-agency commercial MBS | Investment Grade  
Securities Financing Transaction [Line Items]  
Carrying value 25,291
Non-agency commercial MBS | Non-Investment Grade/Non-rated  
Securities Financing Transaction [Line Items]  
Carrying value $ 0