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FHLB and other borrowings (Details) - Schedule of components of FHLB and other borrowings and weighted average interest rates (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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By type of borrowing: |  |
FHLB and other borrowings | $ 525,148 us-gaap_LongTermDebt | $ 495,553 us-gaap_LongTermDebt
Weighted average interest rates | 1.51%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRate | 1.48%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRate
By remaining period to maturity: |  |
One year or less | 238,148 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInNextRollingTwelveMonths | 258,553 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInNextRollingTwelveMonths
One year or less | 0.50%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInNextTwelveRollingMonths | 0.50%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInNextTwelveRollingMonths
One to two years | 55,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearTwo | 30,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearTwo
One to two years | 1.20%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearTwo | 1.40%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearTwo
Two to three years | 71,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearThree | 71,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearThree
Two to three years | 2.33%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearThree | 2.33%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearThree
Three to four years | 96,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearFour | 96,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearFour
Three to four years | 2.67%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearFour | 2.67%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearFour
Four to five years | 25,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryInRollingYearFive |
Four to five years | 1.85%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingInRollingYearFive |
Greater than five years | 40,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAfterRollingYearFive | 40,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAfterRollingYearFive
Greater than five years | 3.43%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingAfterRollingYearFive | 3.42%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRateMaturingAfterRollingYearFive
Federal Home Loan Bank Advances [Member] |  |
By type of borrowing: |  |
FHLB and other borrowings | 494,148 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 464,553 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Weighted average interest rates | 1.23%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember | 1.18%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Repurchase Agreements [Member] |  |
By type of borrowing: |  |
FHLB and other borrowings | $ 31,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember | $ 31,000 us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember
Weighted average interest rates | 5.90%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember | 5.90%us-gaap_FederalHomeLoanBankAdvancesWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_RepurchaseAgreementsMember

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- Definition Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Par amount of advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing after the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the fourth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Weighted average interest rate on advances made and reported by Federal Home Loan Bank maturing in the third rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Weighted average interest rate on advances made and reported by Federal Home Loan Bank (FHLBank) maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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