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Fair Value of Financial Instruments - Differences Between Fair Value and Principal Balance for Loans Held for Sale Measured at Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Aggregate fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | $ 318,549 | $ 672,924
Nonaccrual commercial loans held for sale | 5,087 | 5,217
Aggregate fair value | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | 73,092 | 74,082
Aggregate Unpaid Principal Balance |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | 320,516 | 658,017
Nonaccrual commercial loans held for sale | 9,788 | 9,899
Aggregate Unpaid Principal Balance | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | 76,028 | 76,863
Difference |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | (1,967) | 14,907
Nonaccrual commercial loans held for sale | (4,701) | (4,682)
Difference | Commercial |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage loans held for sale measured at fair value | $ (2,936) | $ (2,781)

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