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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financial assets: |  |
Securities available for sale, at fair value | $ 1,177,606 | $ 671,488
Derivative instruments | 772 | 0
Mortgage loans held for sale in loans held for sale | 252,025 | 108,316
Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 10,304 | 9,388
Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 34,965 | 17,290
Government agency mortgage backed securities | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 560,587 | 193,950
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 21,735 | 31,170
Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 307,228 | 176,639
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 28,962 | 5,006
Recurring |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,177,606 | 671,488
Derivative instruments | 11,116 | 5,977
Mortgage loans held for sale in loans held for sale | 252,025 | 108,316
Total financial assets | 1,440,747 | 785,781
Financial liabilities: |  |
Derivative instruments | 5,313 | 6,039
Total financial liabilities | 5,313 | 6,039
Recurring | Interest rate swaps |  |
Financial assets: |  |
Derivative instruments | 772 |
Financial liabilities: |  |
Derivative instruments | 781 | 2,536
Recurring | Interest rate contracts |  |
Financial assets: |  |
Derivative instruments | 4,370 | 3,171
Financial liabilities: |  |
Derivative instruments | 4,370 | 3,171
Recurring | Interest rate lock commitments |  |
Financial assets: |  |
Derivative instruments | 4,309 | 2,756
Financial liabilities: |  |
Derivative instruments | 83 | 4
Recurring | Forward commitments |  |
Financial assets: |  |
Derivative instruments | 1,665 | 50
Financial liabilities: |  |
Derivative instruments | 79 | 328
Recurring | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 10,304 | 9,388
Recurring | Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 34,965 | 17,290
Recurring | Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale, at fair value | 3,506 | 3,564
Recurring | Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale, at fair value | 210,319 | 234,481
Recurring | Government agency mortgage backed securities | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 560,587 | 193,950
Recurring | Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 21,735 | 31,170
Recurring | Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 307,228 | 176,639
Recurring | Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 28,962 | 5,006
Recurring | Level 1 |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Derivative instruments | 0 | 0
Mortgage loans held for sale in loans held for sale | 0 | 0
Total financial assets | 0 | 0
Financial liabilities: |  |
Derivative instruments | 0 | 0
Total financial liabilities | 0 | 0
Recurring | Level 1 | Interest rate swaps |  |
Financial assets: |  |
Derivative instruments | 0 |
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 1 | Interest rate contracts |  |
Financial assets: |  |
Derivative instruments | 0 | 0
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 1 | Interest rate lock commitments |  |
Financial assets: |  |
Derivative instruments | 0 | 0
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 1 | Forward commitments |  |
Financial assets: |  |
Derivative instruments | 0 | 0
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 1 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 1 | Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 1 | Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 1 | Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 1 | Government agency mortgage backed securities | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 1 | Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 1 | Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 1 | Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 2 |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,167,302 | 662,100
Derivative instruments | 11,116 | 5,977
Mortgage loans held for sale in loans held for sale | 252,025 | 108,316
Total financial assets | 1,430,443 | 776,393
Financial liabilities: |  |
Derivative instruments | 5,313 | 6,039
Total financial liabilities | 5,313 | 6,039
Recurring | Level 2 | Interest rate swaps |  |
Financial assets: |  |
Derivative instruments | 772 |
Financial liabilities: |  |
Derivative instruments | 781 | 2,536
Recurring | Level 2 | Interest rate contracts |  |
Financial assets: |  |
Derivative instruments | 4,370 | 3,171
Financial liabilities: |  |
Derivative instruments | 4,370 | 3,171
Recurring | Level 2 | Interest rate lock commitments |  |
Financial assets: |  |
Derivative instruments | 4,309 | 2,756
Financial liabilities: |  |
Derivative instruments | 83 | 4
Recurring | Level 2 | Forward commitments |  |
Financial assets: |  |
Derivative instruments | 1,665 | 50
Financial liabilities: |  |
Derivative instruments | 79 | 328
Recurring | Level 2 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 2 | Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 34,965 | 17,290
Recurring | Level 2 | Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale, at fair value | 3,506 | 3,564
Recurring | Level 2 | Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale, at fair value | 210,319 | 234,481
Recurring | Level 2 | Government agency mortgage backed securities | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 560,587 | 193,950
Recurring | Level 2 | Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 21,735 | 31,170
Recurring | Level 2 | Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 307,228 | 176,639
Recurring | Level 2 | Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 28,962 | 5,006
Recurring | Level 3 |  |
Financial assets: |  |
Securities available for sale, at fair value | 10,304 | 9,388
Derivative instruments | 0 | 0
Mortgage loans held for sale in loans held for sale | 0 | 0
Total financial assets | 10,304 | 9,388
Financial liabilities: |  |
Derivative instruments | 0 | 0
Total financial liabilities | 0 | 0
Recurring | Level 3 | Interest rate swaps |  |
Financial assets: |  |
Derivative instruments | 0 |
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 3 | Interest rate contracts |  |
Financial assets: |  |
Derivative instruments | 0 | 0
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 3 | Interest rate lock commitments |  |
Financial assets: |  |
Derivative instruments | 0 | 0
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 3 | Forward commitments |  |
Financial assets: |  |
Derivative instruments | 0 | 0
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 3 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 10,304 | 9,388
Recurring | Level 3 | Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 3 | Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 3 | Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 3 | Government agency mortgage backed securities | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 3 | Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 3 | Government agency collateralized mortgage obligations | Residential mortgage backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 3 | Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale, at fair value | $ 0 | $ 0

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