| **Income Tax (Details) - USD ($) $ in Thousands**              | 3 Months Ended | 6 Months Ended |
|----------------------------------------------------------------|----------------|----------------|
||
| **Reconciliation of Federal Statutory to Actual Tax Expense:** |           |           |   |   |
| Federal statutory income tax at 21%                            | $ 9,002        | $ 13,830       | $ 20,731 | $ 26,098 |
| Tax-exempt interest income                                     | (4,877)        | (3,893)        | (9,397) | (7,599) |
| Share-based compensation                                       | (55)           | (13)           | (67) | (72) |
| Tax-exempt earnings and gains on life insurance                | (275)          | (253)          | (629) | (534) |
| Tax credits                                                    | (83)           | (77)           | (170) | (150) |
| State Income Tax                                               | 24             | 872            | 519 | 1,574 |
| Other                                                          | 143            | (172)          | 158 | (71) |
| Actual Tax Expense                                             | $ 3,879        | $ 10,294       | $ 11,145 | $ 19,246 |
| Effective Tax Rate                                             | 9.00%          | 15.60%         | 11.30% | 15.50% |

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| - Definition
Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions.
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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.
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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.
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