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Borrowed Funds (Pledged financial instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Pledged to secure borrowed funds $ 335,570 $ 339,078
Pledged to secure repurchase agreements 58,137 70,555
Pledged for public deposits and for other purposes necessary or required by law 38,465 39,038
Total 432,172 448,671
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 58,137 70,555
State and Local Funds Purchased [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 2,393 3,639
Mortgage Backed Securities, Other [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates 20,781 23,075
Collateralized Mortgage Obligations [Member]    
Short-term Debt [Line Items]    
AFS securities pledged without single maturity dates $ 34,963 $ 43,841