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Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | $ 5,983 | $ 9,496
Mortgage Servicing Rights | 6,800 | 1,900
Other loans | 5,161,919 | 4,997,318
Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 5,983 | 9,496
Other loans | 5,161,919 | 4,997,318
Nonrecurring basis |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 5,983 | 9,496
Mortgage Servicing Rights | 6,769 | 1,867
Other loans | 6,897 | 8,515
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 | 6,769 | 1,867
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 | 5,983 | 9,496
Other loans | 6,897 | 8,515
Nonrecurring basis | Commercial real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 3,057 | 3,698
Other loans | 2,644 | 2,796
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 | 3,057 | 3,698
Other loans | 2,644 | 2,796
Nonrecurring basis | Construction real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans | 3,322 | 3,387
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 | 3,322 | 3,387
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 | Remaining commercial |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 541 | 1,872
Nonrecurring basis | Remaining commercial | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 541 | 1,872
Nonrecurring basis | Residential real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 2,385 | 1,882
Other loans | 931 | 2,332
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 | 2,385 | 1,882
Other loans | $ 931 | $ 2,332

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