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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial assets: |  |
Securities available for sale | $ 1,150,459 | $ 674,248
Trust preferred securities |  |
Financial assets: |  |
Securities available for sale | 8,960 | 18,389
Other debt securities |  |
Financial assets: |  |
Securities available for sale | 26,919 | 22,145
Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale | 14,638 | 2,158
Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale | 350,354 |
Government agency mortgage backed securities | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 459,558 | 409,317
Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 45,929 | 50,863
Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 232,658 | 168,826
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 11,443 | 2,550
Recurring |  |
Financial assets: |  |
Securities available for sale | 1,150,459 | 674,248
Derivative instruments | 8,569 | 9,108
Mortgage loans held for sale | 207,288 | 177,866
Total financial assets | 1,366,316 | 861,222
Financial liabilities: |  |
Derivative instruments | 8,429 | 5,910
Total financial liabilities | 8,429 | 5,910
Recurring | Interest rate swaps |  |
Financial liabilities: |  |
Derivative instruments | 3,242 | 3,410
Recurring | Interest rate contracts |  |
Financial assets: |  |
Derivative instruments | 4,681 | 1,985
Financial liabilities: |  |
Derivative instruments | 4,681 | 1,985
Recurring | Interest rate lock commitments |  |
Financial assets: |  |
Derivative instruments | 3,327 | 2,643
Financial liabilities: |  |
Derivative instruments | 57 | 246
Recurring | Forward commitments |  |
Financial assets: |  |
Derivative instruments | 561 | 4,480
Financial liabilities: |  |
Derivative instruments | 449 | 269
Recurring | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale | 8,960 | 18,389
Recurring | Other debt securities |  |
Financial assets: |  |
Securities available for sale | 26,919 | 22,145
Recurring | Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale | 14,638 | 2,158
Recurring | Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale | 350,354 |
Recurring | Government agency mortgage backed securities | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 459,558 | 409,317
Recurring | Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 45,929 | 50,863
Recurring | Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 232,658 | 168,826
Recurring | Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 11,443 | 2,550
Recurring | Level 1 |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Derivative instruments | 0 | 0
Mortgage 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 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 | 0 | 0
Recurring | Level 1 | Other debt securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 1 | Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 1 | Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale | 0 |
Recurring | Level 1 | Government agency mortgage backed securities | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 1 | Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 1 | Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 1 | Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 2 |  |
Financial assets: |  |
Securities available for sale | 1,141,499 | 655,859
Derivative instruments | 8,569 | 9,108
Mortgage loans held for sale | 207,288 | 177,866
Total financial assets | 1,357,356 | 842,833
Financial liabilities: |  |
Derivative instruments | 8,429 | 5,910
Total financial liabilities | 8,429 | 5,910
Recurring | Level 2 | Interest rate swaps |  |
Financial liabilities: |  |
Derivative instruments | 3,242 | 3,410
Recurring | Level 2 | Interest rate contracts |  |
Financial assets: |  |
Derivative instruments | 4,681 | 1,985
Financial liabilities: |  |
Derivative instruments | 4,681 | 1,985
Recurring | Level 2 | Interest rate lock commitments |  |
Financial assets: |  |
Derivative instruments | 3,327 | 2,643
Financial liabilities: |  |
Derivative instruments | 57 | 246
Recurring | Level 2 | Forward commitments |  |
Financial assets: |  |
Derivative instruments | 561 | 4,480
Financial liabilities: |  |
Derivative instruments | 449 | 269
Recurring | Level 2 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 2 | Other debt securities |  |
Financial assets: |  |
Securities available for sale | 26,919 | 22,145
Recurring | Level 2 | Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale | 14,638 | 2,158
Recurring | Level 2 | Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale | 350,354 |
Recurring | Level 2 | Government agency mortgage backed securities | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 459,558 | 409,317
Recurring | Level 2 | Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 45,929 | 50,863
Recurring | Level 2 | Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 232,658 | 168,826
Recurring | Level 2 | Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 11,443 | 2,550
Recurring | Level 3 |  |
Financial assets: |  |
Securities available for sale | 8,960 | 18,389
Derivative instruments | 0 | 0
Mortgage loans held for sale | 0 | 0
Total financial assets | 8,960 | 18,389
Financial liabilities: |  |
Derivative instruments | 0 | 0
Total financial liabilities | 0 | 0
Recurring | Level 3 | Interest rate swaps |  |
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 | 8,960 | 18,389
Recurring | Level 3 | Other debt securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 3 | Obligations of other U.S. Government agencies and corporations |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 3 | Obligations of states and political subdivisions |  |
Financial assets: |  |
Securities available for sale | 0 |
Recurring | Level 3 | Government agency mortgage backed securities | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 3 | Government agency mortgage backed securities | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 3 | Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | 0 | 0
Recurring | Level 3 | Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Financial assets: |  |
Securities available for sale | $ 0 | $ 0

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