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Borrowed Funds (Pledged financial instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Pledged to secure borrowed funds $ 429,612 $ 431,430
Pledged to secure repurchase agreements 30,087 40,316
Pledged for public deposits and for other purposes necessary or required by law 34,800 58,107
Total 494,499 529,853
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 30,087 40,316
State and Local Funds Purchased [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 28,879 23,268
Mortgage Backed Securities, Other [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 0 10,736
Collateralized Mortgage Obligations [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates $ 1,208 $ 6,312