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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Unfunded lines of credit and undisbursed construction loan funds $ 357.3 $ 361.7
Letter Of Credit [Member]    
Line of Credit Facility [Line Items]    
Letters of credit outstanding $ 17.1 $ 15.2