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Fair Value Measurements - General Disclosures (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | $ 1,848,073 | $ 697,685
Equity securities | 5,362 | 6,169
Loans held for sale, at fair value | 39,607 | 25,895
U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 58,535 | 25,411
Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 290,766 | 52,342
Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 278,930 | 170,044
Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 124,155 | 1,942
Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 961,137 | 315,748
Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 134,550 | 132,198
Recurring basis |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 5,362 | 6,169
Loans held for sale, at fair value | 39,607 | 25,895
Recurring basis | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Fair value recorded in other assets | 13,083 | 2,062
Recurring basis | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair value recorded in other liabilities | 13,897 | 2,643
Recurring basis | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 58,535 | 25,411
Recurring basis | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 290,766 | 52,342
Recurring basis | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 278,930 | 170,044
Recurring basis | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 124,155 | 1,942
Recurring basis | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 961,137 | 315,748
Recurring basis | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 134,550 | 132,198
Recurring basis | Level 1 |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities |  | 6,169
Recurring basis | Level 2 |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 5,362 |
Loans held for sale, at fair value | 39,607 | 25,895
Recurring basis | Level 2 | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Fair value recorded in other assets | 13,083 | 2,062
Recurring basis | Level 2 | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Fair value recorded in other liabilities | 13,897 | 2,643
Recurring basis | Level 2 | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 58,535 | 25,411
Recurring basis | Level 2 | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 290,766 | 52,342
Recurring basis | Level 2 | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 278,930 | 170,044
Recurring basis | Level 2 | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 124,155 | 1,942
Recurring basis | Level 2 | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 961,137 | 315,748
Recurring basis | Level 2 | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | $ 134,550 | $ 132,198

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