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Transactions with Related Persons (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Loans and Leases Receivable, Related Parties [Roll Forward] |  |  |
Beginning balance | $ 145,000 | $ 199,000 |
New loans | 19,000 | 5,000 |
Repayments | (47,000) | (59,000) |
Ending balance | 117,000 | $ 145,000 | $ 199,000
Unfunded loan commitments available to related parties | $ 2,600,000 |  |
Price of repurchased shares (usd per share) | $ 410.48 | $ 451.33 |
Credit Card |  |  |
Loans and Leases Receivable, Related Parties [Roll Forward] |  |  |
Loans receivable excluded from total amount, threshold | $ 15,000 |  |
Overdraw Line |  |  |
Loans and Leases Receivable, Related Parties [Roll Forward] |  |  |
Loans receivable excluded from total amount, threshold | $ 5,000 |  |
Class A Common Stock |  |  |
Loans and Leases Receivable, Related Parties [Roll Forward] |  |  |
Share repurchased from related party (in shares) | 813,090 | 998,910 | 382,000
Class A Common Stock | Related Party |  |  |
Loans and Leases Receivable, Related Parties [Roll Forward] |  |  |
Share repurchased from related party (in shares) | 45,000 | 100,000 |

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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(e)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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