| **Accumulated Other Comprehensive Income (Loss) - Reclassifications (Details) - USD ($) $ in Thousands**                                                        | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]**                                                                     |           |   |
| Net realized gains on sales of available for sale securities                                                                                                    | $ 1,140        | $ 1,609 |
| Interest expense - subordinated debentures and term loans                                                                                                       | 2,116          | 1,990 |
| Income tax expense                                                                                                                                              | (6,941)        | (6,611) |
| Total reclassifications for the period, net of tax                                                                                                              | 854            | 1,137 |
| 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                                                                                                              | 901            | 1,271 |
| 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                                                                                                              | (47)           | (134) |
| Unrealized Gains (Losses) on Defined Benefit Plans                                                                                                              |           |   |
| **Reclassification Adjustments out of Accumulated Other Comprehensive Income [Line Items]**                                                                     |           |   |
| Total reclassifications for the period, net of tax                                                                                                              | 0              | 0 |
| 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]**                                                                     |           |   |
| Net realized gains on sales of available for sale securities                                                                                                    | 1,140          | 1,609 |
| Income tax expense                                                                                                                                              | (239)          | (338) |
| 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                                                                                                                                              | 12             | 36 |
| 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                                                                                                       | $ (59)         | $ (170) |

| X                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).
+ References
No definition available.
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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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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cost of borrowed funds accounted for as interest expense for debt.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
+ References
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