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

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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Total aggregate amount of all noninterest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 14 -Article 9 + Details
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- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 + Details
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- Definition The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Amount of expense related to credit loss from transactions other than loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 + Details
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