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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Debt securities at fair value $ 907,052 $ 956,430
Accrued interest related to AFS debt securities 4,100 3,200
Callable debt securities, fair value 169,300  
Equity securities at fair value 2,961 1,785
Collateral Pledged    
Debt Securities, Available-for-sale [Line Items]    
Debt securities, pledged as collateral 895,900 949,300
Mortgage backed securities, excluding CMOs    
Debt Securities, Available-for-sale [Line Items]    
Debt securities at fair value $ 23,000 $ 22,900