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Guarantees, Commitments, and Contingencies (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2021
PPP Loans [Member] | Small Business Administration [Member] |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Nonrefundable loan processing fees received | $ 15,882,000 | $ 15,882,000 | $ 20,883,000 | $ 36,765,000
Financial Standby Letters of Credit [Member] |  |  |  |
Commitments, Contingencies and Guarantees [Line Items] |  |  |  |
Commitments to extend credit |  | $ 43,997,000 | $ 39,468,000 |

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- Definition Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 + Details
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