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Fair Value Accounting (Fair Value Adjustments Recognized in Earnings for Assets Measured at Fair Value on a Non-recurring Basis) (Details) - Fair Value, Measurements, Nonrecurring Basis - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value adjustment | $ 13,933 | $ 5,661 | $ 14,823 | $ 20,412
Other real estate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value adjustment | 0 | 107 | 0 | 138
MPS receivable |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value adjustment | 0 | 0 | 0 | 2,663
Other assets held for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value adjustment | $ 301 | $ 0 | $ 301 | $ 2,120

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