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Loans and Allowance for Loan Losses (Details 1) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Financing Receivable, Allowance For Credit Losses [Line Items] |  |
Letters of credit outstanding, Amount | $ 105,808 us-gaap_LettersOfCreditOutstandingAmount | $ 94,307 us-gaap_LettersOfCreditOutstandingAmount
Loan commitments and unused lines of credit [Member] |  |
Financing Receivable, Allowance For Credit Losses [Line Items] |  |
Letters of credit outstanding, Amount | 105,136 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember | 93,286 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_UnusedLinesOfCreditMember
Standby letters of credit [Member] |  |
Financing Receivable, Allowance For Credit Losses [Line Items] |  |
Letters of credit outstanding, Amount | $ 672 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember | $ 1,021 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember

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- Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_UnusedLinesOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |