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Borrowings - Summary (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Borrowings
Total borrowings	$ 160,391,000us-gaap_DebtLongtermAndShorttermCombinedAmount	$ 169,914,000us-gaap_DebtLongtermAndShorttermCombinedAmount
Securities sold under repurchase agreements
Borrowings
Total borrowings	26,513,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember	21,036,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember
FHLBC advances
Borrowings
Total borrowings	30,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember	45,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_FederalHomeLoanBankAdvancesMember
Junior subordinated debentures
Borrowings
Total borrowings	58,378,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember	58,378,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_JuniorSubordinatedDebtMember
Subordinated debt
Borrowings
Total borrowings	45,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember	45,000,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_SubordinatedDebtMember
Notes payable and other borrowings
Borrowings
Total borrowings	$ 500,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_NotesPayableToBanksMember	$ 500,000us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_DebtInstrumentAxis = us-gaap_NotesPayableToBanksMember

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