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Note 23 - Quarterly Results of Operations (Unaudited) (Details) - Quarterly Results of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Results of Operations [Abstract]                              
Total interest income $ 56,091us-gaap_InterestAndDividendIncomeOperating $ 47,886us-gaap_InterestAndDividendIncomeOperating $ 44,759us-gaap_InterestAndDividendIncomeOperating $ 42,837us-gaap_InterestAndDividendIncomeOperating $ 41,652us-gaap_InterestAndDividendIncomeOperating $ 39,724us-gaap_InterestAndDividendIncomeOperating $ 37,985us-gaap_InterestAndDividendIncomeOperating $ 37,933us-gaap_InterestAndDividendIncomeOperating $ 38,164us-gaap_InterestAndDividendIncomeOperating $ 36,636us-gaap_InterestAndDividendIncomeOperating $ 34,575us-gaap_InterestAndDividendIncomeOperating $ 32,568us-gaap_InterestAndDividendIncomeOperating $ 191,573us-gaap_InterestAndDividendIncomeOperating $ 157,294us-gaap_InterestAndDividendIncomeOperating $ 141,943us-gaap_InterestAndDividendIncomeOperating
Total interest expense 4,275us-gaap_InterestExpense 3,251us-gaap_InterestExpense 2,739us-gaap_InterestExpense 2,830us-gaap_InterestExpense 2,938us-gaap_InterestExpense 3,021us-gaap_InterestExpense 3,121us-gaap_InterestExpense 3,424us-gaap_InterestExpense 3,427us-gaap_InterestExpense 3,328us-gaap_InterestExpense 3,561us-gaap_InterestExpense 4,098us-gaap_InterestExpense 13,095us-gaap_InterestExpense 12,504us-gaap_InterestExpense 14,414us-gaap_InterestExpense
Net interest income 51,816us-gaap_InterestIncomeExpenseNet 44,635us-gaap_InterestIncomeExpenseNet 42,020us-gaap_InterestIncomeExpenseNet 40,007us-gaap_InterestIncomeExpenseNet 38,714us-gaap_InterestIncomeExpenseNet 36,703us-gaap_InterestIncomeExpenseNet 34,864us-gaap_InterestIncomeExpenseNet 34,509us-gaap_InterestIncomeExpenseNet 34,737us-gaap_InterestIncomeExpenseNet 33,308us-gaap_InterestIncomeExpenseNet 31,014us-gaap_InterestIncomeExpenseNet 28,470us-gaap_InterestIncomeExpenseNet 178,478us-gaap_InterestIncomeExpenseNet 144,790us-gaap_InterestIncomeExpenseNet 127,529us-gaap_InterestIncomeExpenseNet
Provision for credit losses 3,700us-gaap_ProvisionForOtherCreditLosses 2,111us-gaap_ProvisionForOtherCreditLosses 3,134us-gaap_ProvisionForOtherCreditLosses 1,934us-gaap_ProvisionForOtherCreditLosses 2,508us-gaap_ProvisionForOtherCreditLosses 1,372us-gaap_ProvisionForOtherCreditLosses 2,357us-gaap_ProvisionForOtherCreditLosses 3,365us-gaap_ProvisionForOtherCreditLosses 4,139us-gaap_ProvisionForOtherCreditLosses 3,638us-gaap_ProvisionForOtherCreditLosses 4,443us-gaap_ProvisionForOtherCreditLosses 3,970us-gaap_ProvisionForOtherCreditLosses      
Net interest income after provision for credit losses 48,116us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 42,524us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 38,886us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 38,073us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 36,206us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 35,331us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 32,507us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 31,144us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 30,598us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 29,670us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 26,571us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 24,500us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 167,599us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 135,188us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 111,339us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest income 5,310us-gaap_NoninterestIncome 4,761us-gaap_NoninterestIncome 3,811us-gaap_NoninterestIncome 4,463us-gaap_NoninterestIncome 4,304us-gaap_NoninterestIncome 5,236us-gaap_NoninterestIncome 7,065us-gaap_NoninterestIncome 8,111us-gaap_NoninterestIncome 6,060us-gaap_NoninterestIncome 4,851us-gaap_NoninterestIncome 4,441us-gaap_NoninterestIncome 6,012us-gaap_NoninterestIncome 18,345us-gaap_NoninterestIncome 24,716us-gaap_NoninterestIncome 21,364us-gaap_NoninterestIncome
Noninterest expense 29,352us-gaap_NoninterestExpense 25,143us-gaap_NoninterestExpense 22,135us-gaap_NoninterestExpense 23,098us-gaap_NoninterestExpense 21,524us-gaap_NoninterestExpense 21,673us-gaap_NoninterestExpense 20,685us-gaap_NoninterestExpense 20,697us-gaap_NoninterestExpense 20,325us-gaap_NoninterestExpense 19,107us-gaap_NoninterestExpense 18,537us-gaap_NoninterestExpense 18,562us-gaap_NoninterestExpense 99,728us-gaap_NoninterestExpense 84,579us-gaap_NoninterestExpense 76,531us-gaap_NoninterestExpense
Income before income tax expense 24,074us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 22,142us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 20,562us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 19,438us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 18,986us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 18,894us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 18,887us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 18,558us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 16,333us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 15,414us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 12,475us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 11,950us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 86,216us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 75,325us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 56,172us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense 9,347us-gaap_IncomeTaxExpenseBenefit 8,054us-gaap_IncomeTaxExpenseBenefit 7,618us-gaap_IncomeTaxExpenseBenefit 6,939us-gaap_IncomeTaxExpenseBenefit 6,983us-gaap_IncomeTaxExpenseBenefit 7,137us-gaap_IncomeTaxExpenseBenefit 7,212us-gaap_IncomeTaxExpenseBenefit 6,986us-gaap_IncomeTaxExpenseBenefit 6,135us-gaap_IncomeTaxExpenseBenefit 5,739us-gaap_IncomeTaxExpenseBenefit 4,692us-gaap_IncomeTaxExpenseBenefit 4,317us-gaap_IncomeTaxExpenseBenefit 31,958us-gaap_IncomeTaxExpenseBenefit 28,318us-gaap_IncomeTaxExpenseBenefit 20,883us-gaap_IncomeTaxExpenseBenefit
Net income 14,727us-gaap_NetIncomeLoss 14,088us-gaap_NetIncomeLoss 12,944us-gaap_NetIncomeLoss 12,499us-gaap_NetIncomeLoss 12,003us-gaap_NetIncomeLoss 11,757us-gaap_NetIncomeLoss 11,675us-gaap_NetIncomeLoss 11,572us-gaap_NetIncomeLoss 10,198us-gaap_NetIncomeLoss 9,675us-gaap_NetIncomeLoss 7,783us-gaap_NetIncomeLoss 7,633us-gaap_NetIncomeLoss 54,258us-gaap_NetIncomeLoss 47,007us-gaap_NetIncomeLoss 35,289us-gaap_NetIncomeLoss
Preferred stock dividends and discount accretion 180us-gaap_PreferredStockDividendsAndOtherAdjustments 151us-gaap_PreferredStockDividendsAndOtherAdjustments 142us-gaap_PreferredStockDividendsAndOtherAdjustments 141us-gaap_PreferredStockDividendsAndOtherAdjustments 141us-gaap_PreferredStockDividendsAndOtherAdjustments 142us-gaap_PreferredStockDividendsAndOtherAdjustments 142us-gaap_PreferredStockDividendsAndOtherAdjustments 141us-gaap_PreferredStockDividendsAndOtherAdjustments 141us-gaap_PreferredStockDividendsAndOtherAdjustments 142us-gaap_PreferredStockDividendsAndOtherAdjustments 142us-gaap_PreferredStockDividendsAndOtherAdjustments 141us-gaap_PreferredStockDividendsAndOtherAdjustments 614us-gaap_PreferredStockDividendsAndOtherAdjustments 566us-gaap_PreferredStockDividendsAndOtherAdjustments 566us-gaap_PreferredStockDividendsAndOtherAdjustments
Net income available to common shareholders $ 14,547us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 13,937us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 12,802us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 12,358us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 11,862us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 11,615us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 11,533us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 11,431us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 10,057us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 9,533us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 7,641us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 7,492us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 53,644us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 46,441us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 34,723us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Earnings per common share                              
Basic (1) (in Dollars per share) $ 0.51us-gaap_EarningsPerShareBasic [1] $ 0.54us-gaap_EarningsPerShareBasic [1] $ 0.49us-gaap_EarningsPerShareBasic [1] $ 0.48us-gaap_EarningsPerShareBasic [1] $ 0.46us-gaap_EarningsPerShareBasic [1],[2] $ 0.45us-gaap_EarningsPerShareBasic [1],[2] $ 0.45us-gaap_EarningsPerShareBasic [1],[2] $ 0.45us-gaap_EarningsPerShareBasic [1],[2] $ 0.40us-gaap_EarningsPerShareBasic [1],[2] $ 0.41us-gaap_EarningsPerShareBasic [1],[2] $ 0.34us-gaap_EarningsPerShareBasic [1],[2] $ 0.34us-gaap_EarningsPerShareBasic [1],[2] $ 2.01us-gaap_EarningsPerShareBasic $ 1.81us-gaap_EarningsPerShareBasic $ 1.50us-gaap_EarningsPerShareBasic
Diluted (1) (in Dollars per share) $ 0.49us-gaap_EarningsPerShareDiluted [1] $ 0.52us-gaap_EarningsPerShareDiluted [1] $ 0.48us-gaap_EarningsPerShareDiluted [1] $ 0.47us-gaap_EarningsPerShareDiluted [1] $ 0.45us-gaap_EarningsPerShareDiluted [1],[2] $ 0.44us-gaap_EarningsPerShareDiluted [1],[2] $ 0.44us-gaap_EarningsPerShareDiluted [1],[2] $ 0.44us-gaap_EarningsPerShareDiluted [1],[2] $ 0.39us-gaap_EarningsPerShareDiluted [1],[2] $ 0.40us-gaap_EarningsPerShareDiluted [1],[2] $ 0.33us-gaap_EarningsPerShareDiluted [1],[2] $ 0.33us-gaap_EarningsPerShareDiluted [1],[2] $ 1.95us-gaap_EarningsPerShareDiluted $ 1.76us-gaap_EarningsPerShareDiluted $ 1.46us-gaap_EarningsPerShareDiluted
[1] Earnings per common share are calculated on a quarterly basis and may not be additive to the year to date amount.
[2] Per share amounts have been adjusted to give effect to the 10% common stock dividend paid on June 14, 2013.