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LONG-TERM OBLIGATIONS - Maturities of Fixed Rate Long-term Obligations (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Long-term Debt, Fiscal Year Maturity [Abstract]    
2015 1,048us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
2016 155,776us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
2017 263,839us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
2018 75,288us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
2019 42,357us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Thereafter 122,055us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Total long-term obligations 660,363us-gaap_LongTermDebt 559,660us-gaap_LongTermDebt
FHLB advances    
Long-term Debt, Fiscal Year Maturity [Abstract]    
2015 1,048us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
2016 155,776us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
2017 263,839us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
2018 75,288us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
2019 42,357us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
Thereafter 61,744us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
Total long-term obligations 600,052us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
 
Long-term debt    
Long-term Debt, Fiscal Year Maturity [Abstract]    
2015 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
2016 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
2017 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
2018 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
2019 0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Thereafter 60,311us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Total long-term obligations 60,311us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LongTermDebtMember
 
Maximum    
Debt Instrument [Line Items]    
Maturity range of FHLB advances 14  
Fixed interest rate on FHLB advances, range to 5.00%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeTo
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Minimum    
Debt Instrument [Line Items]    
Maturity range of FHLB advances 1  
Fixed interest rate on FHLB advances, range from 0.40%us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateRangeFrom
/ us-gaap_RangeAxis
= us-gaap_MinimumMember