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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financial assets: |  |
Securities available for sale, at fair value | $ 1,343,457 | $ 1,290,613
Derivative instruments | 3,866 | 61
Financial liabilities: |  |
Derivative instruments | 21,107 | 9,974
Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 9,012 | 9,986
Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 65,607 | 56,365
Recurring |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,343,457 | 1,290,613
Derivative instruments | 33,574 | 8,498
Mortgage loans held for sale in loans held for sale | 417,771 | 318,272
Total financial assets | 1,794,802 | 1,617,383
Financial liabilities: |  |
Derivative instruments | 21,107 | 10,000
Recurring | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 9,012 | 9,986
Recurring | Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,334,445 | 1,280,627
Recurring | Level 1 |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Derivative instruments | 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 debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 2 |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,334,445 | 1,280,627
Derivative instruments | 33,574 | 8,498
Mortgage loans held for sale in loans held for sale | 417,771 | 318,272
Total financial assets | 1,785,790 | 1,607,397
Financial liabilities: |  |
Derivative instruments | 21,107 | 10,000
Recurring | Level 2 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 0 | 0
Recurring | Level 2 | Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 1,334,445 | 1,280,627
Recurring | Level 3 |  |
Financial assets: |  |
Securities available for sale, at fair value | 9,012 | 9,986
Derivative instruments | 0 | 0
Mortgage loans held for sale in loans held for sale | 0 | 0
Total financial assets | 9,012 | 9,986
Financial liabilities: |  |
Derivative instruments | 0 | 0
Recurring | Level 3 | Trust preferred securities |  |
Financial assets: |  |
Securities available for sale, at fair value | 9,012 | 9,986
Recurring | Level 3 | Other debt securities |  |
Financial assets: |  |
Securities available for sale, at fair value | $ 0 | $ 0

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