Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
INTEREST REVENUE:
Loans and leases	$ 102,135	$ 98,744
Deposits with other banks	236	276
Available-for-sale securities:
Taxable	6,844	7,547
Tax-exempt	3,377	3,715
Loans held for sale	905	317
Total interest revenue	113,497	110,599
Deposits:
Interest bearing demand	2,183	1,920
Savings	412us-gaap_InterestExpenseSavingsDeposits	391us-gaap_InterestExpenseSavingsDeposits
Other time	4,007us-gaap_InterestExpenseTimeDeposits	5,890us-gaap_InterestExpenseTimeDeposits
Federal funds purchased and securities sold under agreement to repurchase	82	78
Long-term debt	577	629
Junior subordinated debt	163	168
Total interest expense	7,424us-gaap_InterestExpense	9,076us-gaap_InterestExpense
Net interest revenue	106,073us-gaap_InterestIncomeExpenseNet	101,523us-gaap_InterestIncomeExpenseNet
Provision for credit losses	(5,000)
Net interest revenue, after provision for credit losses	111,073	101,523
NONINTEREST REVENUE:
Mortgage lending	8,567	3,394
Credit card, debit card and merchant fees	8,539us-gaap_FeesAndCommissionsCreditCards	7,843us-gaap_FeesAndCommissionsCreditCards
Deposit service charges	11,252	12,536
Security (losses) gains, net	14us-gaap_TradingGainsLosses	(4)us-gaap_TradingGainsLosses
Insurance commissions	33,493us-gaap_InsuranceCommissionsAndFees	31,599us-gaap_InsuranceCommissionsAndFees
Wealth management	6,210	5,916
Other	5,240us-gaap_NoninterestIncomeOther	5,233us-gaap_NoninterestIncomeOther
Total noninterest revenue	73,315us-gaap_NoninterestIncome	66,517us-gaap_NoninterestIncome
NONINTEREST EXPENSE:
Salaries and employee benefits	81,179us-gaap_LaborAndRelatedExpense	78,883us-gaap_LaborAndRelatedExpense
Occupancy, net of rental income	10,194us-gaap_OccupancyNet	10,287us-gaap_OccupancyNet
Equipment	3,974us-gaap_EquipmentExpense	4,499us-gaap_EquipmentExpense
Deposit insurance assessments	2,311	1,600
Other	39,275us-gaap_OtherNoninterestExpense	31,438us-gaap_OtherNoninterestExpense
Total noninterest expense	136,933us-gaap_NoninterestExpense	126,707us-gaap_NoninterestExpense
Income before income taxes	47,455	41,333
Income tax expense	15,189us-gaap_IncomeTaxExpenseBenefit	12,889us-gaap_IncomeTaxExpenseBenefit
Net income	$ 32,266us-gaap_NetIncomeLoss	$ 28,444us-gaap_NetIncomeLoss
Earnings per share:
Basic (in dollars per share)	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.30us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.30us-gaap_EarningsPerShareDiluted
Dividends declared per common share (in dollars per share)	$ 0.075	$ 0.05

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