| **CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (USD $)In Thousands, unless otherwise specified**                                                | 3 Months Ended                                                                                         |
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| **Statement of Comprehensive Income [Abstract]**                                                                                                             |                                                                                                   |   |
| Net income                                                                                                                                                   | $ 16,172us-gaap_NetIncomeLoss                                                                          | $ 13,620us-gaap_NetIncomeLoss |
| **Other comprehensive income net of tax:**                                                                                                                   |                                                                                                   |   |
| Unrealized holding gain on securities available for sale arising during the period, net of tax of $528 and $2,804                                            | 980us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax    | 5,207us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
| Unrealized gain on securities available for sale for which a portion of an other than temporary impairment has been recognized in income, net of tax of $627 |                                                                                              | 1,164us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAvailableforsaleSecurities |
| Unrealized loss on cash flow hedges arising during the period, net of tax of $447 and $443                                                                   | (829)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax        | (823)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax |
| Reclassification adjustment for losses included in net income, net of tax of $235 and $83                                                                    | (436)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax | (154)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |
| Period change                                                                                                                                                | (285)us-gaap_OtherComprehensiveIncomeLossNetOfTax                                                      | 5,394us-gaap_OtherComprehensiveIncomeLossNetOfTax |
| Comprehensive income                                                                                                                                         | $ 15,887us-gaap_ComprehensiveIncomeNetOfTax                                                            | $ 19,014us-gaap_ComprehensiveIncomeNetOfTax |

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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
+ References
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
+ References
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| - Definition
Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.
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| - Definition
Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
+ References
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| - Definition
Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.
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| - Definition
Amount after tax of other than temporary impairment (OTTI) on investment in available-for-sale debt security, recognized in other comprehensive loss, attributable to parent entity.
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