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Unaudited Quarterly Financial Data (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
Summarized unaudited quarterly financial data |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 76,179us-gaap_InterestAndDividendIncomeOperating | $ 75,690us-gaap_InterestAndDividendIncomeOperating | $ 73,963us-gaap_InterestAndDividendIncomeOperating | $ 74,087us-gaap_InterestAndDividendIncomeOperating | $ 73,939us-gaap_InterestAndDividendIncomeOperating | $ 69,531us-gaap_InterestAndDividendIncomeOperating | $ 62,151us-gaap_InterestAndDividendIncomeOperating | $ 57,955us-gaap_InterestAndDividendIncomeOperating | $ 299,919us-gaap_InterestAndDividendIncomeOperating | $ 263,576us-gaap_InterestAndDividendIncomeOperating | $ 253,757us-gaap_InterestAndDividendIncomeOperating
Interest expense | 7,368us-gaap_InterestExpense | 6,430us-gaap_InterestExpense | 6,528us-gaap_InterestExpense | 6,640us-gaap_InterestExpense | 6,929us-gaap_InterestExpense | 7,186us-gaap_InterestExpense | 7,185us-gaap_InterestExpense | 7,458us-gaap_InterestExpense | 26,966us-gaap_InterestExpense | 28,758us-gaap_InterestExpense | 35,714us-gaap_InterestExpense
Net Interest Income | 68,811us-gaap_InterestIncomeExpenseNet | 69,260us-gaap_InterestIncomeExpenseNet | 67,435us-gaap_InterestIncomeExpenseNet | 67,447us-gaap_InterestIncomeExpenseNet | 67,010us-gaap_InterestIncomeExpenseNet | 62,345us-gaap_InterestIncomeExpenseNet | 54,966us-gaap_InterestIncomeExpenseNet | 50,497us-gaap_InterestIncomeExpenseNet | 272,953us-gaap_InterestIncomeExpenseNet | 234,818us-gaap_InterestIncomeExpenseNet | 218,043us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 191us-gaap_ProvisionForLoanLeaseAndOtherLosses | 360us-gaap_ProvisionForLoanLeaseAndOtherLosses | 239us-gaap_ProvisionForLoanLeaseAndOtherLosses | 1,122us-gaap_ProvisionForLoanLeaseAndOtherLosses | 1,802us-gaap_ProvisionForLoanLeaseAndOtherLosses | 1,907us-gaap_ProvisionForLoanLeaseAndOtherLosses | 1,078us-gaap_ProvisionForLoanLeaseAndOtherLosses | 2,100us-gaap_ProvisionForLoanLeaseAndOtherLosses | 1,912us-gaap_ProvisionForLoanLeaseAndOtherLosses | 6,887us-gaap_ProvisionForLoanLeaseAndOtherLosses | 21,525us-gaap_ProvisionForLoanLeaseAndOtherLosses
Net interest income after provision for loan losses | 68,620us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 68,900us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 67,196us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 66,325us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 65,208us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 60,438us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 53,888us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 48,397us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 271,041us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 227,931us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 196,518us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest Income | 23,978us-gaap_NoninterestIncome | 24,432us-gaap_NoninterestIncome | 22,504us-gaap_NoninterestIncome | 19,388us-gaap_NoninterestIncome | 23,002us-gaap_NoninterestIncome | 23,873us-gaap_NoninterestIncome | 23,222us-gaap_NoninterestIncome | 22,950us-gaap_NoninterestIncome | 90,302us-gaap_NoninterestIncome | 93,047us-gaap_NoninterestIncome | 91,496us-gaap_NoninterestIncome
Noninterest Expense | 55,698us-gaap_NoninterestExpense | 54,238us-gaap_NoninterestExpense | 52,673us-gaap_NoninterestExpense | 50,070us-gaap_NoninterestExpense | 53,034us-gaap_NoninterestExpense | 50,368us-gaap_NoninterestExpense | 48,481us-gaap_NoninterestExpense | 43,434us-gaap_NoninterestExpense | 212,679us-gaap_NoninterestExpense | 195,317us-gaap_NoninterestExpense | 193,421us-gaap_NoninterestExpense
Income Before Income Taxes | 36,900us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 39,094us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 37,027us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 35,643us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 35,176us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 33,943us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 28,629us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 27,913us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 148,664us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 125,661us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 94,593us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Federal and state income tax expense | 8,846us-gaap_IncomeTaxExpenseBenefit | 9,800us-gaap_IncomeTaxExpenseBenefit | 8,350us-gaap_IncomeTaxExpenseBenefit | 8,913us-gaap_IncomeTaxExpenseBenefit | 8,630us-gaap_IncomeTaxExpenseBenefit | 8,315us-gaap_IncomeTaxExpenseBenefit | 5,927us-gaap_IncomeTaxExpenseBenefit | 7,145us-gaap_IncomeTaxExpenseBenefit | 35,909us-gaap_IncomeTaxExpenseBenefit | 30,017us-gaap_IncomeTaxExpenseBenefit | 19,077us-gaap_IncomeTaxExpenseBenefit
Net Income | $ 28,054us-gaap_NetIncomeLoss | $ 29,294us-gaap_NetIncomeLoss | $ 28,677us-gaap_NetIncomeLoss | $ 26,730us-gaap_NetIncomeLoss | $ 26,546us-gaap_NetIncomeLoss | $ 25,628us-gaap_NetIncomeLoss | $ 22,702us-gaap_NetIncomeLoss | $ 20,768us-gaap_NetIncomeLoss | $ 112,755us-gaap_NetIncomeLoss | $ 95,644us-gaap_NetIncomeLoss | $ 75,516us-gaap_NetIncomeLoss
Basic earnings per share | $ 0.37us-gaap_EarningsPerShareBasic | $ 0.40us-gaap_EarningsPerShareBasic | $ 0.38us-gaap_EarningsPerShareBasic | $ 0.36us-gaap_EarningsPerShareBasic | $ 0.36us-gaap_EarningsPerShareBasic | $ 0.35us-gaap_EarningsPerShareBasic | $ 0.31us-gaap_EarningsPerShareBasic | $ 0.29us-gaap_EarningsPerShareBasic | $ 1.51us-gaap_EarningsPerShareBasic | $ 1.31us-gaap_EarningsPerShareBasic | $ 1.05us-gaap_EarningsPerShareBasic
Diluted earnings per share | $ 0.37us-gaap_EarningsPerShareDiluted | $ 0.40us-gaap_EarningsPerShareDiluted | $ 0.38us-gaap_EarningsPerShareDiluted | $ 0.36us-gaap_EarningsPerShareDiluted | $ 0.36us-gaap_EarningsPerShareDiluted | $ 0.35us-gaap_EarningsPerShareDiluted | $ 0.31us-gaap_EarningsPerShareDiluted | $ 0.29us-gaap_EarningsPerShareDiluted | $ 1.51us-gaap_EarningsPerShareDiluted | $ 1.31us-gaap_EarningsPerShareDiluted | $ 1.05us-gaap_EarningsPerShareDiluted

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