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FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK: (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]        
Other Commitments     $ 50,850,000us-gaap_OtherCommitment $ 51,113,000us-gaap_OtherCommitment
TOTAL     354,592,000us-gaap_CommitmentsAndContingencies 375,470,000us-gaap_CommitmentsAndContingencies
Minimum        
Loss Contingencies [Line Items]        
Loans and Leases Receivable, Commitments, Fixed Rates 0.0325us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.0325us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum        
Loss Contingencies [Line Items]        
Loans and Leases Receivable, Commitments, Fixed Rates 0.0525us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
0.0650us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Commercial Operating Lines        
Loss Contingencies [Line Items]        
TOTAL     249,354,000us-gaap_CommitmentsAndContingencies
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
265,910,000us-gaap_CommitmentsAndContingencies
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyAndCasualtyCommercialInsuranceProductLineMember
Commercial letters of credit        
Loss Contingencies [Line Items]        
TOTAL     7,684,000us-gaap_CommitmentsAndContingencies
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LetterOfCreditMember
7,642,000us-gaap_CommitmentsAndContingencies
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LetterOfCreditMember
Home Equity        
Loss Contingencies [Line Items]        
TOTAL     $ 54,388,000us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
$ 58,447,000us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember