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Fair Value Measurements - Total Net Gains Losses on Assets Measured at Fair Value on a Non-Recurring Basis (Details) - Change during period - Non-recurring basis - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Real estate loans |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total gains (losses), fair value | $ (17,311) | $ (4,659)
Commercial business |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total gains (losses), fair value | (2,634) | (4,656)
Consumer |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total gains (losses), fair value | 0 | (608)
Loans held for sale, net |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total gains (losses), fair value | $ (169) | $ (826)

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