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Noninterest Income and Noninterest Expense (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Income And Expenses [Abstract] |  |  |  |
Net gain on sales of assets | $ 33,200 | $ 982 | $ 593 | $ 24,654

X
- Definition Amount of gain (loss) on sale or disposal of assets utilized in financial service operations. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration