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Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 23,280 us-gaap_InterestAndDividendIncomeOperating | $ 22,118 us-gaap_InterestAndDividendIncomeOperating | $ 21,453 us-gaap_InterestAndDividendIncomeOperating | $ 20,379 us-gaap_InterestAndDividendIncomeOperating | $ 18,842 us-gaap_InterestAndDividendIncomeOperating | $ 9,021 us-gaap_InterestAndDividendIncomeOperating | $ 7,946 us-gaap_InterestAndDividendIncomeOperating | $ 6,821 us-gaap_InterestAndDividendIncomeOperating | $ 87,230 us-gaap_InterestAndDividendIncomeOperating | $ 42,630 us-gaap_InterestAndDividendIncomeOperating | $ 26,952 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 1,951 us-gaap_InterestExpense | 1,723 us-gaap_InterestExpense | 1,572 us-gaap_InterestExpense | 1,524 us-gaap_InterestExpense | 1,484 us-gaap_InterestExpense | 893 us-gaap_InterestExpense | 803 us-gaap_InterestExpense | 767 us-gaap_InterestExpense | 6,770 us-gaap_InterestExpense | 3,947 us-gaap_InterestExpense | 3,715 us-gaap_InterestExpense
Net interest income | 21,329 us-gaap_InterestIncomeExpenseNet | 20,395 us-gaap_InterestIncomeExpenseNet | 19,881 us-gaap_InterestIncomeExpenseNet | 18,855 us-gaap_InterestIncomeExpenseNet | 17,358 us-gaap_InterestIncomeExpenseNet | 8,128 us-gaap_InterestIncomeExpenseNet | 7,143 us-gaap_InterestIncomeExpenseNet | 6,054 us-gaap_InterestIncomeExpenseNet | 80,460 us-gaap_InterestIncomeExpenseNet | 38,683 us-gaap_InterestIncomeExpenseNet | 23,237 us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 1,811 us-gaap_ProvisionForLoanAndLeaseLosses | 1,375 us-gaap_ProvisionForLoanAndLeaseLosses | 1,747 us-gaap_ProvisionForLoanAndLeaseLosses | 925 us-gaap_ProvisionForLoanAndLeaseLosses | 1,057 us-gaap_ProvisionForLoanAndLeaseLosses | 1,735 us-gaap_ProvisionForLoanAndLeaseLosses | 241 us-gaap_ProvisionForLoanAndLeaseLosses | 379 us-gaap_ProvisionForLoanAndLeaseLosses | 5,858 us-gaap_ProvisionForLoanAndLeaseLosses | 3,412 us-gaap_ProvisionForLoanAndLeaseLosses | 1,739 us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses | 19,518 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 19,020 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 18,134 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 17,930 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 16,301 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,393 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,902 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 5,675 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 74,602 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 35,271 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 21,498 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Gain on branch sale |  | 12,619 us-gaap_GainLossOnSaleOfBusiness |  |  |  |  |  |  | 12,619 us-gaap_GainLossOnSaleOfBusiness |  |
Bargain purchase gain |  |  |  |  | 9,014 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |  |  |  |  | 9,014 us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount |
Other noninterest income | 3,721 us-gaap_NoninterestIncomeOtherOperatingIncome | 3,185 us-gaap_NoninterestIncomeOtherOperatingIncome | 2,633 us-gaap_NoninterestIncomeOtherOperatingIncome | 2,609 us-gaap_NoninterestIncomeOtherOperatingIncome | 2,508 us-gaap_NoninterestIncomeOtherOperatingIncome | 717 us-gaap_NoninterestIncomeOtherOperatingIncome | 329 us-gaap_NoninterestIncomeOtherOperatingIncome | 445 us-gaap_NoninterestIncomeOtherOperatingIncome | 3,231 us-gaap_NoninterestIncomeOtherOperatingIncome | 702 us-gaap_NoninterestIncomeOtherOperatingIncome | 290 us-gaap_NoninterestIncomeOtherOperatingIncome
Total noninterest income | 3,721 us-gaap_NoninterestIncome | 15,804 us-gaap_NoninterestIncome | 2,633 us-gaap_NoninterestIncome | 2,609 us-gaap_NoninterestIncome | 11,522 us-gaap_NoninterestIncome | 717 us-gaap_NoninterestIncome | 329 us-gaap_NoninterestIncome | 445 us-gaap_NoninterestIncome | 24,767 us-gaap_NoninterestIncome | 13,013 us-gaap_NoninterestIncome | 2,661 us-gaap_NoninterestIncome
Noninterest expense | 19,685 us-gaap_NoninterestExpense | 18,461 us-gaap_NoninterestExpense | 16,160 us-gaap_NoninterestExpense | 14,896 us-gaap_NoninterestExpense | 14,657 us-gaap_NoninterestExpense | 6,547 us-gaap_NoninterestExpense | 6,173 us-gaap_NoninterestExpense | 5,347 us-gaap_NoninterestExpense | 69,202 us-gaap_NoninterestExpense | 32,724 us-gaap_NoninterestExpense | 18,479 us-gaap_NoninterestExpense
Net income before income tax | 3,554 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 16,363 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 4,607 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,643 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,166 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 563 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 1,058 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 773 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 30,167 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 15,560 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,680 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense | 747 us-gaap_IncomeTaxExpenseBenefit | 6,089 us-gaap_IncomeTaxExpenseBenefit | 1,626 us-gaap_IncomeTaxExpenseBenefit | 1,916 us-gaap_IncomeTaxExpenseBenefit | 1,449 us-gaap_IncomeTaxExpenseBenefit | 211 us-gaap_IncomeTaxExpenseBenefit | 356 us-gaap_IncomeTaxExpenseBenefit | 117 us-gaap_IncomeTaxExpenseBenefit | 10,378 us-gaap_IncomeTaxExpenseBenefit | 2,133 us-gaap_IncomeTaxExpenseBenefit | (5,394)us-gaap_IncomeTaxExpenseBenefit
Net income | 2,807 us-gaap_ProfitLoss | 10,274 us-gaap_ProfitLoss | 2,981 us-gaap_ProfitLoss | 3,727 us-gaap_ProfitLoss | 11,717 us-gaap_ProfitLoss | 352 us-gaap_ProfitLoss | 702 us-gaap_ProfitLoss | 656 us-gaap_ProfitLoss | 19,789 us-gaap_ProfitLoss | 13,427 us-gaap_ProfitLoss | 11,074 us-gaap_ProfitLoss
Income attributable to noncontrolling interests | (589)us-gaap_IncomeLossAttributableToNoncontrollingInterest | (584)us-gaap_IncomeLossAttributableToNoncontrollingInterest | (500)us-gaap_IncomeLossAttributableToNoncontrollingInterest | (387)us-gaap_IncomeLossAttributableToNoncontrollingInterest | (220)us-gaap_IncomeLossAttributableToNoncontrollingInterest | (21)us-gaap_IncomeLossAttributableToNoncontrollingInterest | (29)us-gaap_IncomeLossAttributableToNoncontrollingInterest | (597)us-gaap_IncomeLossAttributableToNoncontrollingInterest |  |  |
Dividends on preferred stock | (197)us-gaap_DividendsPreferredStock | (195)us-gaap_DividendsPreferredStock | (196)us-gaap_DividendsPreferredStock | (192)us-gaap_DividendsPreferredStock | (179)us-gaap_DividendsPreferredStock | (95)us-gaap_DividendsPreferredStock | (91)us-gaap_DividendsPreferredStock | (356)us-gaap_DividendsPreferredStock | (780)us-gaap_DividendsPreferredStock | (721)us-gaap_DividendsPreferredStock |
Net income available to common stockholders | $ 2,021 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,495 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 2,285 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,148 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,318 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 236 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 582 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (297)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 16,949 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 11,839 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 10,081 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings (loss) per common share |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.14 us-gaap_EarningsPerShareBasic | $ 0.96 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.32 us-gaap_EarningsPerShareBasic | $ 1.17 us-gaap_EarningsPerShareBasic | $ 0.03 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ (0.04)us-gaap_EarningsPerShareBasic | $ 1.55 us-gaap_EarningsPerShareBasic | $ 1.40 us-gaap_EarningsPerShareBasic | $ 2.24 us-gaap_EarningsPerShareBasic
Diluted | $ 0.14 us-gaap_EarningsPerShareDiluted | $ 0.91 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.32 us-gaap_EarningsPerShareDiluted | $ 1.12 us-gaap_EarningsPerShareDiluted | $ 0.03 us-gaap_EarningsPerShareDiluted | $ 0.07 us-gaap_EarningsPerShareDiluted | $ (0.04)us-gaap_EarningsPerShareDiluted | $ 1.52 us-gaap_EarningsPerShareDiluted | $ 1.39 us-gaap_EarningsPerShareDiluted | $ 2.24 us-gaap_EarningsPerShareDiluted

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