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Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | $ 9,496 | $ 16,963
Mortgage Servicing Rights | 1,900 | 2,900
Other loans | 4,997,318 | 4,757,461
Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 9,496 | 16,963
Other loans | 4,997,318 | 4,757,461
Nonrecurring basis |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 9,496 | 16,963
Mortgage Servicing Rights | 1,867 | 2,928
Other loans | 8,515 | 10,312
Nonrecurring basis | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 0 | 0
Nonrecurring basis | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Mortgage Servicing Rights | 1,867 | 2,928
Other loans | 0 | 0
Nonrecurring basis | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 9,496 | 16,963
Other loans | 8,515 | 10,312
Nonrecurring basis | Commercial real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 3,698 | 8,481
Other loans | 2,796 | 1,470
Nonrecurring basis | Commercial real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 0 | 0
Nonrecurring basis | Commercial real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 0 | 0
Nonrecurring basis | Commercial real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 3,698 | 8,481
Other loans | 2,796 | 1,470
Nonrecurring basis | Construction real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 3,387 | 6,473
Nonrecurring basis | Construction real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 0 | 0
Nonrecurring basis | Construction real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 0 | 0
Nonrecurring basis | Construction real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 3,387 | 6,473
Nonrecurring basis | SEPH commercial land and development |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 2,044 |
Nonrecurring basis | SEPH commercial land and development | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 2,044 |
Nonrecurring basis | SEPH commercial land and development |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value |  | 2,078
Nonrecurring basis | SEPH commercial land and development | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value |  | 2,078
Nonrecurring basis | Remaining commercial |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 1,872 | 3,483
Nonrecurring basis | Remaining commercial | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 1,872 | 3,483
Nonrecurring basis | Residential real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 1,882 | 2,921
Other loans | 2,332 | 2,369
Nonrecurring basis | Residential real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 0 | 0
Nonrecurring basis | Residential real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 0 | 0
Nonrecurring basis | Residential real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 1,882 | 2,921
Other loans | $ 2,332 | $ 2,369

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