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Fair Value of Financial Instruments - Balances and Levels of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets: |  |
Available-for-sale securities: | $ 1,683,525 | $ 1,678,525
Equity securities | 3,213 | 3,367
Mortgage-backed securities - residential |  |
Financial assets: |  |
Available-for-sale securities: | 1,232,256 | 1,269,372
Mortgage-backed securities - commercial |  |
Financial assets: |  |
Available-for-sale securities: | 14,307 | 15,250
Municipal securities |  |
Financial assets: |  |
Available-for-sale securities: | 310,138 | 338,610
Treasury securities |  |
Financial assets: |  |
Available-for-sale securities: | 80,173 | 14,908
Corporate securities |  |
Financial assets: |  |
Available-for-sale securities: | 7,769 | 6,515
Recurring Basis |  |
Financial assets: |  |
Equity securities | 3,213 | 3,367
Total securities | 1,686,738 | 1,681,892
Loans held for sale | 396,728 | 752,223
Mortgage servicing rights | 144,675 | 115,512
Derivatives | 38,180 | 27,384
Financial liabilities: |  |
Derivatives | 33,029 | 21,000
Recurring Basis | U.S. government agency securities |  |
Financial assets: |  |
Available-for-sale securities: | 38,882 | 33,870
Recurring Basis | Mortgage-backed securities - residential |  |
Financial assets: |  |
Available-for-sale securities: | 1,232,256 | 1,269,372
Recurring Basis | Mortgage-backed securities - commercial |  |
Financial assets: |  |
Available-for-sale securities: | 14,307 | 15,250
Recurring Basis | Municipal securities |  |
Financial assets: |  |
Available-for-sale securities: | 310,138 | 338,610
Recurring Basis | Treasury securities |  |
Financial assets: |  |
Available-for-sale securities: | 80,173 | 14,908
Recurring Basis | Corporate securities |  |
Financial assets: |  |
Available-for-sale securities: | 7,769 | 6,515
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) |  |
Financial assets: |  |
Equity securities | 0 | 0
Total securities | 0 | 0
Loans held for sale | 0 | 0
Mortgage servicing rights | 0 | 0
Derivatives | 0 | 0
Financial liabilities: |  |
Derivatives | 0 | 0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | U.S. government agency securities |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed securities - residential |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Mortgage-backed securities - commercial |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Municipal securities |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Treasury securities |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Quoted prices in active markets for identical assets (liabilities) (level 1) | Corporate securities |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Significant other observable inputs (level 2) |  |
Financial assets: |  |
Equity securities | 3,213 | 3,367
Total securities | 1,686,738 | 1,681,892
Loans held for sale | 318,549 | 672,924
Mortgage servicing rights | 0 | 0
Derivatives | 38,180 | 27,384
Financial liabilities: |  |
Derivatives | 33,029 | 21,000
Recurring Basis | Significant other observable inputs (level 2) | U.S. government agency securities |  |
Financial assets: |  |
Available-for-sale securities: | 38,882 | 33,870
Recurring Basis | Significant other observable inputs (level 2) | Mortgage-backed securities - residential |  |
Financial assets: |  |
Available-for-sale securities: | 1,232,256 | 1,269,372
Recurring Basis | Significant other observable inputs (level 2) | Mortgage-backed securities - commercial |  |
Financial assets: |  |
Available-for-sale securities: | 14,307 | 15,250
Recurring Basis | Significant other observable inputs (level 2) | Municipal securities |  |
Financial assets: |  |
Available-for-sale securities: | 310,138 | 338,610
Recurring Basis | Significant other observable inputs (level 2) | Treasury securities |  |
Financial assets: |  |
Available-for-sale securities: | 80,173 | 14,908
Recurring Basis | Significant other observable inputs (level 2) | Corporate securities |  |
Financial assets: |  |
Available-for-sale securities: | 7,769 | 6,515
Recurring Basis | Significant unobservable inputs (level 3) |  |
Financial assets: |  |
Equity securities | 0 | 0
Total securities | 0 | 0
Loans held for sale | 78,179 | 79,299
Mortgage servicing rights | 144,675 | 115,512
Derivatives | 0 | 0
Financial liabilities: |  |
Derivatives | 0 | 0
Recurring Basis | Significant unobservable inputs (level 3) | U.S. government agency securities |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Significant unobservable inputs (level 3) | Mortgage-backed securities - residential |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Significant unobservable inputs (level 3) | Mortgage-backed securities - commercial |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Significant unobservable inputs (level 3) | Municipal securities |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Significant unobservable inputs (level 3) | Treasury securities |  |
Financial assets: |  |
Available-for-sale securities: | 0 | 0
Recurring Basis | Significant unobservable inputs (level 3) | Corporate securities |  |
Financial assets: |  |
Available-for-sale securities: | $ 0 | $ 0

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