| **Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($) $ in Thousands**                                                        | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]**                                                                     |           |   |
| Other income - net realized gains on sales of available for sale securities                                                                                     | $ 997          | $ 1,025 |
| Interest expense - subordinated debentures and term loans                                                                                                       | (1,785)        | (1,660) |
| Income tax expense                                                                                                                                              | (5,574)        | (5,834) |
| Net income                                                                                                                                                      | 17,693         | 16,172 |
| Total reclassifications for the period, net of tax                                                                                                              | 437            | 436 |
| Unrealized gains (losses) on available for sale securities                                                                                                      |           |   |
| **Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]**                                                                     |           |   |
| Total reclassifications for the period, net of tax                                                                                                              | 648            | 666 |
| Unrealized gains (losses) on cash flow hedges                                                                                                                   |           |   |
| **Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]**                                                                     |           |   |
| Total reclassifications for the period, net of tax                                                                                                              | (211)          | (230) |
| Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period | Unrealized gains (losses) on available for sale securities              |           |   |
| **Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]**                                                                     |           |   |
| Other income - net realized gains on sales of available for sale securities                                                                                     | 997            | 1,025 |
| Income tax expense                                                                                                                                              | (349)          | (359) |
| Net income                                                                                                                                                      | 648            | 666 |
| Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period | Unrealized gains (losses) on cash flow hedges                           |           |   |
| **Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]**                                                                     |           |   |
| Income tax expense                                                                                                                                              | 113            | 124 |
| Net income                                                                                                                                                      | (211)          | (230) |
| Amount Reclassified from Accumulated Other Comprehensive Income (Loss) for the Period | Unrealized gains (losses) on cash flow hedges | Interest rate contracts |           |   |
| **Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]**                                                                     |           |   |
| Interest expense - subordinated debentures and term loans                                                                                                       | $ (324)        | $ (354) |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cost of borrowed funds accounted for as interest expense for debt.
+ 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.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
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