Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
INTEREST INCOME:
Interest and fees on loans and leases	$ 53,049	$ 46,384
Interest on securities:
Taxable	7,132us-gaap_InterestIncomeSecuritiesTaxable	7,761us-gaap_InterestIncomeSecuritiesTaxable
Nontaxable	2,916	3,122
Interest on federal funds sold	1us-gaap_InterestIncomeFederalFundsSold	0us-gaap_InterestIncomeFederalFundsSold
Interest on interest bearing deposits in other financial institutions	4	7
TOTAL INTEREST INCOME	63,102	57,274
INTEREST EXPENSE:
Interest on deposits	4,172us-gaap_InterestExpenseDeposits	4,778us-gaap_InterestExpenseDeposits
Interest on short-term borrowings	198	226
Interest on other borrowings (includes $564 and $521 of interest expense related to derivatives reclassified from accumulated other comprehensive income for the three months ended March 31, 2015 and 2014, respectively)	4,802	3,658
TOTAL INTEREST EXPENSE	9,172us-gaap_InterestExpense	8,662us-gaap_InterestExpense
NET INTEREST INCOME	53,930us-gaap_InterestIncomeExpenseNet	48,612us-gaap_InterestIncomeExpenseNet
Provision for loan and lease losses	1,671us-gaap_ProvisionForLoanAndLeaseLosses	6,331us-gaap_ProvisionForLoanAndLeaseLosses
NET INTEREST INCOME AFTER PROVISION FOR LOAN AND LEASE LOSSES	52,259	42,281
NONINTEREST INCOME:
Service charges and fees	5,404	4,896
Loan servicing income	1,041us-gaap_ServicingFeesNet	1,511us-gaap_ServicingFeesNet
Trust fees	3,631	3,210
Brokerage and insurance commissions	1,087us-gaap_InsuranceCommissionsAndFees	1,123us-gaap_InsuranceCommissionsAndFees
Securities gains, net (includes $4,353 and $781 of net security gains reclassified from accumulated other comprehensive income for the three months ended March 31, 2015 and 2014, respectively)	4,353us-gaap_GainLossOnSaleOfSecuritiesNet	781us-gaap_GainLossOnSaleOfSecuritiesNet
Gain (loss) on trading account securities	0us-gaap_TradingGainsLosses	(38)us-gaap_TradingGainsLosses
Net gains on sale of loans held for sale	13,742us-gaap_GainLossOnSaleOfLoansAndLeases	6,379us-gaap_GainLossOnSaleOfLoansAndLeases
Income on bank owned life insurance	524us-gaap_BankOwnedLifeInsuranceIncome	363us-gaap_BankOwnedLifeInsuranceIncome
Other noninterest income	881	625
TOTAL NONINTEREST INCOME	30,663us-gaap_NoninterestIncome	18,850us-gaap_NoninterestIncome
NONINTEREST EXPENSES:
Salaries and employee benefits	36,638us-gaap_LaborAndRelatedExpense	32,319us-gaap_LaborAndRelatedExpense
Occupancy	4,259us-gaap_OccupancyNet	4,050us-gaap_OccupancyNet
Furniture and equipment	2,106us-gaap_EquipmentExpense	1,890us-gaap_EquipmentExpense
Professional fees	6,044us-gaap_ProfessionalFees	4,526us-gaap_ProfessionalFees
FDIC insurance assessments	956	980
Advertising	1,181us-gaap_AdvertisingExpense	1,188us-gaap_AdvertisingExpense
Intangible assets amortization	631us-gaap_AmortizationOfIntangibleAssets	624us-gaap_AmortizationOfIntangibleAssets
Other real estate and loan collection expenses	465	1,052
Loss on sales/valuations of assets, net	353	163
Other noninterest expenses	6,981us-gaap_OtherNoninterestExpense	5,746us-gaap_OtherNoninterestExpense
TOTAL NONINTEREST EXPENSES	59,614us-gaap_NoninterestExpense	52,538us-gaap_NoninterestExpense
INCOME BEFORE INCOME TAXES	23,308	8,593
Income taxes (includes $1,413 and $97 of income tax expense reclassified from accumulated other comprehensive income for the three months ended March 31, 2015 and 2014, respectively)	7,599us-gaap_IncomeTaxExpenseBenefit	1,703us-gaap_IncomeTaxExpenseBenefit
NET INCOME	15,709us-gaap_ProfitLoss	6,890us-gaap_ProfitLoss
Preferred dividends and discount	(204)	(204)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 15,505	$ 6,686
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 0.77us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	$ 0.76us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.10	$ 0.10

Gain (Loss) on Sales and Valuations of Assets

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Earnings on or other increases in the value of the cash surrender value of bank owned life insurance policies.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.

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No definition available.

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- Definition

Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.

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Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.

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Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.

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- Definition

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Income from agency and brokerage operations (includes sales of annuities and supplemental contracts); service charges, commissions, and fees from the sale of insurance and related services; and management fees from separate accounts, deferred annuities, and universal life products.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.

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Amount of the cost of borrowed funds accounted for as interest expense.

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- Definition

Aggregate amount of interest expense on all deposits.

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Interest expense incurred on all other long-term debt, which may include (1) interest on long-term notes, and (2) amortization of issuance costs not otherwise separately disclosed.

+ References

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The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.

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Interest income on federal funds sold. Federal funds sold represent the excess federal funds held by one commercial bank which it lends to another commercial bank, usually at an agreed-upon (federal funds) rate of interest. Such loans generally are of short-duration (overnight).

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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Total aggregate amount of all noninterest expense.

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Represents other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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Other noninterest expenses that are not separately presented in any other noninterest expense category.

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The aggregate value of preferred stock dividends and other adjustments necessary to derive net income apportioned to common stockholders.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Amount of expense related to estimated loss from loan and lease transactions.

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Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

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Amount of gain (loss) resulting from the difference between the acquisition price and the selling price or fair value of trading assets and trading liabilities, conducted separately from customer trading activities. Includes, but is not limited to, changes in fair value of trading assets and trading liabilities.

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