Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income
Residential real estate loans	$ 30,721	$ 29,525	$ 30,850
Commercial loans	145,631	127,450	121,425
Consumer and other loans	30,515	32,089	35,096
Investment securities	93,052	74,512	66,386
Total interest income	299,919	263,576	253,757
Interest Expense
Deposits	13,195us-gaap_InterestExpenseDeposits	13,870us-gaap_InterestExpenseDeposits	18,183us-gaap_InterestExpenseDeposits
Securities sold under agreements to repurchase	865	867	1,308
Federal Home Loan Bank advances	9,570	10,610	12,566
Federal funds purchased and other borrowed funds	199us-gaap_InterestExpenseOther	206us-gaap_InterestExpenseOther	229us-gaap_InterestExpenseOther
Subordinated debentures	3,137	3,205	3,428
Total interest expense	26,966us-gaap_InterestExpense	28,758us-gaap_InterestExpense	35,714us-gaap_InterestExpense
Net Interest Income	272,953us-gaap_InterestIncomeExpenseNet	234,818us-gaap_InterestIncomeExpenseNet	218,043us-gaap_InterestIncomeExpenseNet
Provision for loan losses	1,912	6,887	21,525
Net interest income after provision for loan losses	271,041	227,931	196,518
Non-Interest Income
Service charges and other fees	54,089	49,478	45,343
Miscellaneous loan fees and charges	4,696us-gaap_FeesAndCommissionsOther	4,982us-gaap_FeesAndCommissionsOther	4,363us-gaap_FeesAndCommissionsOther
Gain on sale of loans	19,797us-gaap_GainLossOnSalesOfLoansNet	28,517us-gaap_GainLossOnSalesOfLoansNet	32,227us-gaap_GainLossOnSalesOfLoansNet
Loss on sale of investments	(188)us-gaap_GainLossOnSaleOfSecuritiesNet	(299)us-gaap_GainLossOnSaleOfSecuritiesNet	0us-gaap_GainLossOnSaleOfSecuritiesNet
Other income	11,908	10,369	9,563
Total non-interest income	90,302us-gaap_NoninterestIncome	93,047us-gaap_NoninterestIncome	91,496us-gaap_NoninterestIncome
Non-Interest Expense
Compensation and employee benefits	118,571us-gaap_LaborAndRelatedExpense	104,221us-gaap_LaborAndRelatedExpense	95,373us-gaap_LaborAndRelatedExpense
Occupancy and equipment	27,498us-gaap_OccupancyNet	24,875us-gaap_OccupancyNet	23,837us-gaap_OccupancyNet
Advertising and promotions	7,912us-gaap_AdvertisingExpense	6,913us-gaap_AdvertisingExpense	6,413us-gaap_AdvertisingExpense
Data processing	6,607	4,493	3,324
Other real estate owned	2,568us-gaap_ForeclosedRealEstateExpense	7,196us-gaap_ForeclosedRealEstateExpense	18,964us-gaap_ForeclosedRealEstateExpense
Regulatory assessments and insurance	5,064	6,362	7,313
Core deposit intangible amortization	2,811us-gaap_AmortizationOfIntangibleAssets	2,401us-gaap_AmortizationOfIntangibleAssets	2,110us-gaap_AmortizationOfIntangibleAssets
Other expense	41,648us-gaap_OtherNoninterestExpense	38,856us-gaap_OtherNoninterestExpense	36,087us-gaap_OtherNoninterestExpense
Total non-interest expense	212,679us-gaap_NoninterestExpense	195,317us-gaap_NoninterestExpense	193,421us-gaap_NoninterestExpense
Income Before Income Taxes	148,664	125,661	94,593
Federal and state income tax expense	35,909us-gaap_IncomeTaxExpenseBenefit	30,017us-gaap_IncomeTaxExpenseBenefit	19,077us-gaap_IncomeTaxExpenseBenefit
Net Income	$ 112,755us-gaap_NetIncomeLoss	$ 95,644us-gaap_NetIncomeLoss	$ 75,516us-gaap_NetIncomeLoss
Basic earnings per share	$ 1.51us-gaap_EarningsPerShareBasic	$ 1.31us-gaap_EarningsPerShareBasic	$ 1.05us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 1.51us-gaap_EarningsPerShareDiluted	$ 1.31us-gaap_EarningsPerShareDiluted	$ 1.05us-gaap_EarningsPerShareDiluted
Dividends declared per share	$ 0.98	$ 0.60	$ 0.53
Average outstanding shares - basic	74,641,957	73,191,713	71,928,570
Average outstanding shares - diluted	74,687,315	73,260,278	71,928,656

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