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LOANS: (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 3.2 $ 4.1
Loans serviced for others, not reported as assets 473.8 484.4
Escrow deposit 3.0 2.8
Fair value, based on valuations $ 2.3 $ 2.3
Assumptions used to estimate fair value, discount rate (percent) 13.00% 13.00%
Assumptions used to estimate fair value, weighted average life 8 years  
Director and Executive Officer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance $ 42.7  
Advances 45.6  
Repayments 35.3  
Ending Balance $ 53.0 $ 42.7
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Assumptions used to estimate fair value, prepayment speed (percent) 189.00% 250.00%
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Assumptions used to estimate fair value, prepayment speed (percent) 88.00% 112.00%