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Investment Securities - Cost and Equity Method Investments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment [Line Items] |  |  |
Federal home loan bank stock | $ 22,090,000 | $ 30,060,000 |
Federal reserve bank stock | 14,653,000 | 14,653,000 |
Equity Securities, FV-NI | 2,511,000 | 1,993,000 |
Equity Securities without Readily Determinable Fair Value, Amount | 4,689,000 | 2,689,000 |
Alternative Investment | 21,522,000 | 20,411,000 |
Other Investments and Securities, at Cost | $ 65,465,000 | $ 69,806,000 |
equity investment shares sold | 79,697 | 133,281 |
Proceeds from Sale of Federal Home Loan Bank Stock | $ 8,000,000.0 | $ 13,300,000 |
equity investment purchased, shares | 0 | 128,553 |
Gain on equity securities, net | $ 2,182,000 | $ 5,118,000 | $ 4,616,000
Payments to Acquire Federal Reserve Bank Stock | 0 | 6,428,000 | 0
Alternative Investment, income recognized | 2,400,000 | 4,800,000 | 1,400,000
Investments [Member] |  |  |
Investment [Line Items] |  |  |
Gain on equity securities, net | $ (239,000) |  | $ (287,000)
Common Stock [Member] |  |  |
Investment [Line Items] |  |  |
Gain on equity securities, net |  | $ (345,000) |

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- Definition Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL6742756-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 35 -Paragraph 54B -URI http://asc.fasb.org/extlink&oid=117332851&loc=SL7495116-110257 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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