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Fair Value Measurements - General Disclosures (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | $ 2,080,849 | $ 1,648,257
Equity securities | 17,808 | 5,952
Loans held for sale, at fair value | 87,772 | 68,699
U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 29,937 | 51,737
Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 78,478 | 163,000
Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 316,120 | 268,291
Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 357,243 | 139,287
Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 1,218,526 | 921,966
Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 80,545 | 103,976
Recurring basis |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 17,808 | 5,952
Loans held for sale, at fair value | 87,772 | 68,699
Recurring basis | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative asset | 39,711 | 13,400
Recurring basis | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liability | 45,525 | 14,821
Recurring basis | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 29,937 | 51,737
Recurring basis | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 78,478 | 163,000
Recurring basis | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 316,120 | 268,291
Recurring basis | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 357,243 | 139,287
Recurring basis | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 1,218,526 | 921,966
Recurring basis | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 80,545 | 103,976
Recurring basis | Level 1 |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 13,119 |
Recurring basis | Level 2 |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 4,689 | 5,952
Loans held for sale, at fair value | 87,772 | 68,699
Recurring basis | Level 2 | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative asset | 39,711 | 13,400
Recurring basis | Level 2 | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liability | 45,525 | 14,821
Recurring basis | Level 2 | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 29,937 | 51,737
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 | 78,478 | 163,000
Recurring basis | Level 2 | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 316,120 | 268,291
Recurring basis | Level 2 | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 357,243 | 139,287
Recurring basis | Level 2 | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 1,218,526 | 921,966
Recurring basis | Level 2 | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | $ 80,545 | $ 103,976

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