| **CONSOLIDATED CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (USD $)In Thousands, except Share data, unless otherwise specified** | Total                                                            | Preferred                                                                                            | Common Stock                                                                                                                           | Additional Paid in Capital                                                                                                                     | Retained Earnings                                                                                              | Accumulated Other Comprehensive Income (Loss)                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------|------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------|
| Beginning balance at Dec. 31, 2014                                                                                              | $ 726,827us-gaap_StockholdersEquity                              | $ 125us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_PreferredStockMember | $ 4,709us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                    | $ 431,220us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                              | $ 292,403us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember     | $ (1,630)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember               |
| Beginning balance (in shares) at Dec. 31, 2014                                                                                  |                                                             | 125us-gaap_SharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_PreferredStockMember    | 37,669,948us-gaap_SharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                  |                                                                                                                                           |                                                                                                           |                                                                                                                                        |
| **Comprehensive Income**                                                                                                        |                                                             |                                                                                                 |                                                                                                                                   |                                                                                                                                           |                                                                                                           |                                                                                                                                        |
| Net income                                                                                                                      | 16,172us-gaap_NetIncomeLoss                                      |                                                                                                 |                                                                                                                                   |                                                                                                                                           | 16,172us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember             |                                                                                                                                        |
| Other comprehensive income, net of tax                                                                                          | (285)us-gaap_OtherComprehensiveIncomeLossNetOfTax                |                                                                                                 |                                                                                                                                   |                                                                                                                                           |                                                                                                           | (285)us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember |
| Cash dividends on common stock ($.08 per share)                                                                                 | (3,049)us-gaap_DividendsCommonStockCash                          |                                                                                                 |                                                                                                                                   |                                                                                                                                           | (3,049)us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember |                                                                                                                                        |
| Share-based compensation (in shares)                                                                                            |                                                             |                                                                                                 | 126,531us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember   |                                                                                                                                           |                                                                                                           |                                                                                                                                        |
| Share-based compensation                                                                                                        | 517us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation    |                                                                                                 | 16us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember         | 501us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember    |                                                                                                           |                                                                                                                                        |
| Stock issued under employee benefit plans (in shares)                                                                           |                                                             |                                                                                                 | 6,678us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember        |                                                                                                                                           |                                                                                                           |                                                                                                                                        |
| Stock issued under employee benefit plans                                                                                       | 129us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan       |                                                                                                 | 1us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember             | 128us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember       |                                                                                                           |                                                                                                                                        |
| Stock issued under dividend reinvestment and stock purchase plan (in shares)                                                    |                                                             |                                                                                                 | 5,615us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember |                                                                                                                                           |                                                                                                           |                                                                                                                                        |
| Stock issued under dividend reinvestment and stock purchase plan                                                                | 135us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan |                                                                                                 | 1us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember       | 134us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember |                                                                                                           |                                                                                                                                        |
| Stock options exercised (in shares)                                                                                             | 23,373us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |                                                                                                 | 23,373us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember     |                                                                                                                                           |                                                                                                           |                                                                                                                                        |
| Stock options exercised                                                                                                         | 369us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised     |                                                                                                 | 3us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember           | 366us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember     |                                                                                                           |                                                                                                                                        |
| Stock redeemed (in shares)                                                                                                      |                                                             |                                                                                                 | (50,657)us-gaap_StockRedeemedOrCalledDuringPeriodShares/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember              |                                                                                                                                           |                                                                                                           |                                                                                                                                        |
| Stock redeemed                                                                                                                  | (1,157)us-gaap_StockRedeemedOrCalledDuringPeriodValue            |                                                                                                 | (7)us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                    | (1,150)us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember            |                                                                                                           |                                                                                                                                        |
| Ending balance at Mar. 31, 2015                                                                                                 | $ 739,658us-gaap_StockholdersEquity                              | $ 125us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_PreferredStockMember | $ 4,723us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                    | $ 431,199us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                              | $ 305,526us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember     | $ (1,915)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember               |
| Ending balance (in shares) at Mar. 31, 2015                                                                                     |                                                             | 125us-gaap_SharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_PreferredStockMember    | 37,781,488us-gaap_SharesOutstanding/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                  |                                                                                                                                           |                                                                                                           |                                                                                                                                        |

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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Number of shares issued which are neither cancelled nor held in the treasury.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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Number of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.
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Number of shares issued during the period as a result of an employee stock purchase plan.
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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
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| - Definition
Number of share options (or share units) exercised during the current period.
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Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan.
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| - Definition
Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.
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Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
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Value of stock issued as a result of the exercise of stock options.
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| - Definition
Number of stock bought back by the entity at the exercise price or redemption price.
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Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.
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