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Fair Value Measurements - Balances and Levels of Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | ---
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | $ 553,357 |  | $ 582,183 |  |  |
Mortgage servicing rights, net | 48,464 | $ 47,593 | 33,081 | $ 40,382 | $ 36,611 | $ 29,711
Foreclosed real estate, net | 6,370 | $ 6,811 | 7,403 | $ 9,902 | $ 10,533 | $ 11,641
Impaired loans | 9,214 |  | 12,951 |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 553,357 |  | 582,183 |  |  |
Loans held for sale | 427,416 |  | 507,442 |  |  |
Mortgage servicing rights, net | 48,464 |  |  |  |  |
Derivatives assets | 10,891 |  | 19,745 |  |  |
Financial liabilities: |  |  |  |  |  |
Derivatives liabilities | 1,350 |  | 586 |  |  |
Fair Value, Measurements, Recurring | U.S. Government Agency Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 990 |  | 985 |  |  |
Fair Value, Measurements, Recurring | Mortgage-backed Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 410,708 |  | 443,908 |  |  |
Fair Value, Measurements, Recurring | Municipals, Tax Exempt |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 122,698 |  | 116,923 |  |  |
Fair Value, Measurements, Recurring | Treasury Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 10,310 |  | 11,757 |  |  |
Fair Value, Measurements, Recurring | Equity Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 8,651 |  | 8,610 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 548,808 |  | 577,634 |  |  |
Loans held for sale | 427,416 |  | 507,442 |  |  |
Derivatives assets | 10,891 |  | 19,745 |  |  |
Financial liabilities: |  |  |  |  |  |
Derivatives liabilities | 1,350 |  | 586 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government Agency Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 990 |  | 985 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 410,708 |  | 443,908 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipals, Tax Exempt |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 122,698 |  | 116,923 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Treasury Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 10,310 |  | 11,757 |  |  |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 4,102 |  | 4,061 |  |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 4,549 |  | 4,549 |  |  |
Mortgage servicing rights, net | 48,464 |  |  |  |  |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Available-for-sale securities, at fair value | 4,549 |  | 4,549 |  |  |
Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Mortgage servicing rights, net |  |  | 32,070 |  |  |
Foreclosed real estate, net | 1,434 |  | 2,315 |  |  |
Impaired loans | 518 |  | 1,281 |  |  |
Fair Value, Measurements, Nonrecurring | Commercial and Industrial |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans | 367 |  | 542 |  |  |
Fair Value, Measurements, Nonrecurring | Consumer and Other |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans |  |  | 1 |  |  |
Fair Value, Measurements, Nonrecurring | Non-Owner Occupied | Commercial Real Estate |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans | 151 |  |  |  |  |
Fair Value, Measurements, Nonrecurring | Owner Occupied | Commercial Real Estate |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans |  |  | 635 |  |  |
Fair Value, Measurements, Nonrecurring | 1-to-4 Family Mortgage | Residential Real Estate |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans |  |  | 103 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Mortgage servicing rights, net |  |  | 32,070 |  |  |
Foreclosed real estate, net | 1,434 |  | 2,315 |  |  |
Impaired loans | 518 |  | 1,281 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Commercial and Industrial |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans | 367 |  | 542 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Consumer and Other |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans |  |  | 1 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Non-Owner Occupied | Commercial Real Estate |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans | $ 151 |  |  |  |  |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | Owner Occupied | Commercial Real Estate |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans |  |  | 635 |  |  |
Fair Value, Measurements, Nonrecurring | Significant Unobservable Inputs (Level 3) | 1-to-4 Family Mortgage | Residential Real Estate |  |  |  |  |  |
Financial assets: |  |  |  |  |  |
Impaired loans |  |  | $ 103 |  |  |

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