XML 13 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value of Financial Instruments and Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Assets [Abstract]    
Investment Securities Available for Sale $ 279,139us-gaap_AvailableForSaleSecurities $ 274,594us-gaap_AvailableForSaleSecurities
Investment Securities Held to Maturity 31us-gaap_HeldToMaturitySecuritiesFairValue 30us-gaap_HeldToMaturitySecuritiesFairValue
Liabilities [Abstract]    
Discounted rate to account for selling and marketing costs (in hundredths) 10.00%cban_DiscountedRateToAccountForSellingAndMarketingCosts  
Recurring [Member]    
Assets [Abstract]    
Investment Securities Available for Sale 279,139us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember
274,594us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember
Recurring [Member] | Carrying Amount [Member]    
Assets [Abstract]    
Cash and Short-Term Investments 62,719us-gaap_CashCashEquivalentsAndShortTermInvestments
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65,811us-gaap_CashCashEquivalentsAndShortTermInvestments
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Investment Securities Available for Sale 279,139us-gaap_AvailableForSaleSecurities
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274,594us-gaap_AvailableForSaleSecurities
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Investment Securities Held to Maturity 31us-gaap_HeldToMaturitySecuritiesFairValue
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30us-gaap_HeldToMaturitySecuritiesFairValue
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Federal Home Loan Bank Stock 2,731us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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2,831us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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Loans, Net 744,866us-gaap_LoansReceivableFairValueDisclosure
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736,930us-gaap_LoansReceivableFairValueDisclosure
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Bank-Owned Life Insurance 14,648us-gaap_BankOwnedLifeInsurance
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14,531us-gaap_BankOwnedLifeInsurance
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Liabilities [Abstract]    
Deposits 985,856us-gaap_DepositsFairValueDisclosure
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979,303us-gaap_DepositsFairValueDisclosure
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Subordinated Debentures 24,229us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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24,229us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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Other Borrowed Money 40,000us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
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40,000us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
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Recurring [Member] | Estimated Fair Value [Member]    
Assets [Abstract]    
Cash and Short-Term Investments 62,719us-gaap_CashCashEquivalentsAndShortTermInvestments
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65,811us-gaap_CashCashEquivalentsAndShortTermInvestments
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Investment Securities Available for Sale 279,139us-gaap_AvailableForSaleSecurities
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274,594us-gaap_AvailableForSaleSecurities
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Investment Securities Held to Maturity 31us-gaap_HeldToMaturitySecuritiesFairValue
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Federal Home Loan Bank Stock 2,731us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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2,831us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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Loans, Net 746,714us-gaap_LoansReceivableFairValueDisclosure
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738,948us-gaap_LoansReceivableFairValueDisclosure
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Bank-Owned Life Insurance 14,648us-gaap_BankOwnedLifeInsurance
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14,531us-gaap_BankOwnedLifeInsurance
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Liabilities [Abstract]    
Deposits 987,595us-gaap_DepositsFairValueDisclosure
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980,874us-gaap_DepositsFairValueDisclosure
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Subordinated Debentures 24,229us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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24,229us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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Other Borrowed Money 42,395us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
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41,962us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
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Level 1 [Member] | Recurring [Member]    
Assets [Abstract]    
Cash and Short-Term Investments 62,719us-gaap_CashCashEquivalentsAndShortTermInvestments
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65,811us-gaap_CashCashEquivalentsAndShortTermInvestments
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Investment Securities Available for Sale 0us-gaap_AvailableForSaleSecurities
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Investment Securities Held to Maturity 0us-gaap_HeldToMaturitySecuritiesFairValue
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Federal Home Loan Bank Stock 2,731us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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2,831us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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Loans, Net 0us-gaap_LoansReceivableFairValueDisclosure
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0us-gaap_LoansReceivableFairValueDisclosure
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Bank-Owned Life Insurance 14,648us-gaap_BankOwnedLifeInsurance
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14,531us-gaap_BankOwnedLifeInsurance
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Liabilities [Abstract]    
Deposits 560,599us-gaap_DepositsFairValueDisclosure
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551,057us-gaap_DepositsFairValueDisclosure
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Subordinated Debentures 0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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24,229us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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Other Borrowed Money 0us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
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Level 2 [Member] | Recurring [Member]    
Assets [Abstract]    
Cash and Short-Term Investments 0us-gaap_CashCashEquivalentsAndShortTermInvestments
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0us-gaap_CashCashEquivalentsAndShortTermInvestments
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Investment Securities Available for Sale 278,192us-gaap_AvailableForSaleSecurities
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273,646us-gaap_AvailableForSaleSecurities
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Investment Securities Held to Maturity 31us-gaap_HeldToMaturitySecuritiesFairValue
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Federal Home Loan Bank Stock 0us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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0us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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Loans, Net 740,261us-gaap_LoansReceivableFairValueDisclosure
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731,170us-gaap_LoansReceivableFairValueDisclosure
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Bank-Owned Life Insurance 0us-gaap_BankOwnedLifeInsurance
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Liabilities [Abstract]    
Deposits 426,996us-gaap_DepositsFairValueDisclosure
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429,817us-gaap_DepositsFairValueDisclosure
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Subordinated Debentures 24,229us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisSubordinatedDebtObligations
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Other Borrowed Money 42,395us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
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41,962us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
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Level 3 [Member] | Recurring [Member]    
Assets [Abstract]    
Cash and Short-Term Investments 0us-gaap_CashCashEquivalentsAndShortTermInvestments
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Investment Securities Available for Sale 947us-gaap_AvailableForSaleSecurities
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Investment Securities Held to Maturity 0us-gaap_HeldToMaturitySecuritiesFairValue
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Federal Home Loan Bank Stock 0us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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Loans, Net 6,453us-gaap_LoansReceivableFairValueDisclosure
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7,778us-gaap_LoansReceivableFairValueDisclosure
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Bank-Owned Life Insurance 0us-gaap_BankOwnedLifeInsurance
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Liabilities [Abstract]    
Deposits 0us-gaap_DepositsFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
Other Borrowed Money $ 0us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ 0us-gaap_FederalHomeLoanBankBorrowingsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember