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Borrowed Funds (Pledged financial instruments) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Pledged to secure borrowed funds $ 368,310 $ 431,430
Pledged to secure repurchase agreements 31,020 40,316
Pledged for public deposits and for other purposes necessary or required by law 59,537 58,107
Total 458,867 529,853
Short-term Debt [Line Items]    
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date 31,020 40,316
State and Local Funds Purchased [Member]    
Short-term Debt [Line Items]    
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date 31,020 23,268
Mortgage Backed Securities, Other [Member]    
Short-term Debt [Line Items]    
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date 0 10,736
Collateralized Mortgage Obligations [Member]    
Short-term Debt [Line Items]    
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date $ 0 $ 6,312