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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets: |  |
Securities available for sale, at fair value | $ 1,293,388 | $ 1,290,613
Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 8,492 | 9,986
Recurring |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,293,388 | 1,290,613
Derivative assets: | 40,278 | 8,498
Mortgage loans held for sale in loans held for sale | 399,773 | 318,272
Total financial assets | 1,733,439 | 1,617,383
Financial liabilities: |  |
Derivative instruments | 23,081 | 10,000
Recurring | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 8,492 | 9,986
Recurring | Other available for sale securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,284,896 | 1,280,627
Recurring | Level 1 |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Derivative assets: | 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
Recurring | Level 1 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 1 | Other available for sale securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 2 |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,284,896 | 1,280,627
Derivative assets: | 40,278 | 8,498
Mortgage loans held for sale in loans held for sale | 399,773 | 318,272
Total financial assets | 1,724,947 | 1,607,397
Financial liabilities: |  |
Derivative instruments | 23,081 | 10,000
Recurring | Level 2 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 2 | Other available for sale securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,284,896 | 1,280,627
Recurring | Level 3 |  |
Financial assets: |  |
Securities available for sale, at fair value | 8,492 | 9,986
Derivative assets: | 0 | 0
Mortgage loans held for sale in loans held for sale | 0 | 0
Total financial assets | 8,492 | 9,986
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 3 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 8,492 | 9,986
Recurring | Level 3 | Other available for sale securities |  |
Financial assets: |  |
Securities available for sale, at fair value | $ 0 | $ 0

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