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Borrowed Funds (Pledged financial instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Pledged to secure borrowed funds $ 364,985 $ 368,310
Pledged to secure repurchase agreements 28,171 31,020
Pledged for public deposits and for other purposes necessary or required by law 57,129 59,537
Total 450,285 458,867
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 28,171 31,020
State and Local Funds Purchased [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 12,002 31,020
Mortgage Backed Securities, Other [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 9,492 0
Collateralized Mortgage Obligations [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates $ 6,677 $ 0