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Borrowing Arrangements - Federal Reserve Bank Borrowings (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Borrowing Arrangements    
Amount outstanding $ 0 $ 0
Line of credit | FRB    
Borrowing Arrangements    
Loans pledged as collateral 726,709,000 739,830,000
Line of credit 408,401,000 418,399,000
Amount outstanding $ 0 $ 0