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Fair Value Measurements - General Disclosures (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | $ 3,997,244 | $ 2,261,187
Equity securities | 13,012 | 5,530
Loans held for sale, at fair value | 20,225 | 42,813
U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 185,453 | 27,837
Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 38,997 | 69,519
Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 296,012 | 304,711
Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 603,297 | 418,616
Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 2,102,608 | 1,368,315
Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 468,807 |
Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 302,070 | 72,189
Recurring basis |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 13,012 | 5,530
Loans held for sale, at fair value | 20,225 | 42,813
Recurring basis | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative asset | 21,869 | 33,918
Recurring basis | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liability | 24,501 | 38,403
Recurring basis | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 185,453 | 27,837
Recurring basis | Obligations of U.S. government corporations and agencies |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 38,997 | 69,519
Recurring basis | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 296,012 | 304,711
Recurring basis | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 603,297 | 418,616
Recurring basis | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 2,102,608 | 1,368,315
Recurring basis | Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 468,807 |
Recurring basis | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 302,070 | 72,189
Recurring basis | Level 2 |  |
Financial assets and financial liabilities measured at fair value |  |
Equity securities | 13,012 | 5,530
Loans held for sale, at fair value | 20,225 | 42,813
Recurring basis | Level 2 | Derivative assets |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative asset | 21,869 | 33,918
Recurring basis | Level 2 | Derivative liabilities |  |
Financial assets and financial liabilities measured at fair value |  |
Derivative liability | 24,501 | 38,403
Recurring basis | Level 2 | U.S. Treasury securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 185,453 | 27,837
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 | 38,997 | 69,519
Recurring basis | Level 2 | Obligations of states and political subdivisions |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 296,012 | 304,711
Recurring basis | Level 2 | Commercial mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 603,297 | 418,616
Recurring basis | Level 2 | Residential mortgage-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 2,102,608 | 1,368,315
Recurring basis | Level 2 | Asset-backed securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | 468,807 |
Recurring basis | Level 2 | Corporate debt securities |  |
Financial assets and financial liabilities measured at fair value |  |
Debt securities available for sale | $ 302,070 | $ 72,189

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