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Investment Securities - Cost and Equity Method Investments (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 01, 2018
Investment [Line Items] |  |  |  |
Federal home loan bank stock | $ 30,060,000 | $ 43,388,000 |  |
Federal reserve bank stock | 14,653,000 | 8,225,000 |  |
Equity Securities, FV-NI | 1,993,000 | 1,649,000 |  |
Equity Securities without Readily Determinable Fair Value, Amount | 2,689,000 | 2,589,000 |  |
Alternative Investment | 20,411,000 | 17,065,000 |  |
Other Investments and Securities, at Cost | $ 69,806,000 | $ 72,916,000 |  |
equity investment shares sold | 123,472 | 66,980,000 |  |
Proceeds from Sale of Federal Home Loan Bank Stock | $ 13,300,000 | $ 6,700,000 |  |
equity investment purchased, shares | 128,553 |  |  |
Gain on equity securities, net | $ 5,118,000 | 4,616,000 | $ 1,210,000 |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  | 8.55%
Alternative Investment, income recognized | 4,800,000 | 1,400,000 |  |
securities purchased [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Federal reserve bank stock | 6,400,000 |  |  |
Investments [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Gain on equity securities, net | $ 345,000 |  |  |
Common Stock [Member] |  |  |  |
Investment [Line Items] |  |  |  |
Gain on equity securities, net |  | 287,000 |  |
Equity securities |  |  |  |
Investment [Line Items] |  |  |  |
Equity Securities, FV-NI, Unrealized Gain |  | $ 3,500,000 |  |

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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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