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COMMITMENTS AND CONTINGENCIES, INCLUDING FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK - Derivative Financial (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
Derivative Instruments and Hedging Activities Disclosures [Table]    
Deterioration in the customer’s credit worthiness $ 0 $ 0
Number of interest rate swap agreements | item 14 11
Not Designated as Hedging Instruments    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Notional Amount $ 84,922 $ 56,072
Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Notional amount asset 25,882 13,637
Fair value asset $ 340 $ 430
Weighted Average Maturity 7 years 9 months 29 days 6 years 7 months 6 days
Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with financial institutions    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Notional amount asset $ 16,579 $ 14,399
Fair value asset $ 426 $ 350
Weighted Average Maturity 8 years 1 month 13 days 9 years 5 months 12 days
Not Designated as Hedging Instruments | Other liabilities | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Notional amount liability $ 16,579 $ 14,399
Fair value liability $ (426) $ (350)
Weighted Average Maturity 7 years 9 months 29 days 6 years 7 months 6 days
Not Designated as Hedging Instruments | Other liabilities | Interest rate swaps with financial institutions    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Notional amount liability $ 25,882 $ 13,637
Fair value liability $ (340) $ (430)
Weighted Average Maturity 8 years 1 month 13 days 9 years 5 months 12 days
Minimum | Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Fixed rate 4.75% 5.10%
Minimum | Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with financial institutions    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Fixed rate 4.00% 4.00%
Minimum | Not Designated as Hedging Instruments | Other liabilities | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Fixed rate 4.00% 4.00%
Minimum | Not Designated as Hedging Instruments | Other liabilities | Interest rate swaps with financial institutions    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Fixed rate 4.75% 5.10%
Floating rate 2.50% 2.50%
Minimum | LIBOR | Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Floating rate 2.50% 2.50%
Minimum | LIBOR | Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with financial institutions    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Floating rate 2.50% 2.50%
Minimum | LIBOR | Not Designated as Hedging Instruments | Other liabilities | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Floating rate 2.50% 2.50%
Maximum | Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Fixed rate 7.25% 7.25%
Maximum | Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with financial institutions    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Fixed rate 5.15% 4.75%
Maximum | Not Designated as Hedging Instruments | Other liabilities | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Fixed rate 5.15% 4.75%
Maximum | Not Designated as Hedging Instruments | Other liabilities | Interest rate swaps with financial institutions    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Fixed rate 7.25% 7.25%
Floating rate 3.20% 3.25%
Maximum | LIBOR | Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Floating rate 3.20% 3.25%
Maximum | LIBOR | Not Designated as Hedging Instruments | Other Assets | Interest rate swaps with financial institutions    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Floating rate 3.25% 3.00%
Maximum | LIBOR | Not Designated as Hedging Instruments | Other liabilities | Interest rate swaps with customers    
Derivative Instruments and Hedging Activities Disclosures [Table]    
Floating rate 3.25% 3.00%