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Other Investment Securities (Schedule Of Other Investment Securities) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |  |  |
equity investment shares sold |  |  | 99,646 |  |
Proceeds from Sale of Federal Home Loan Bank Stock |  |  | $ 10,000,000.0 |  |
equity investment purchased, shares |  |  | 128,553 |  |
Federal Home Loan Bank Stock | $ 33,424,000 |  | $ 33,424,000 |  | $ 43,388,000
Federal Reserve Bank Stock | 14,653,000 |  | 14,653,000 |  | 8,225,000
Equity investments carried at fair value | 1,889,000 |  | 1,889,000 |  | 1,649,000
Equity Method Investments | 2,689,000 |  | 2,689,000 |  | 2,589,000
Alternative Investment | 15,989,000 |  | 15,989,000 |  | 17,065,000
Other investment securities | 68,644,000 |  | 68,644,000 |  | 72,916,000
Gain on equity securities, net | 3,335,000 | $ 89,000 | 5,309,000 | $ 4,633,000 |
Alternative Investment, income recognized | 3,300,000 | 415,000 | 5,100,000 | 1,200,000 |
Equity Securities, FV-NI, Unrealized Gain |  |  |  | 3,500,000 |
securities purchased [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Federal Reserve Bank Stock | 6,400,000 |  | 6,400,000 |  |
Equity Securities [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gain on equity securities, net | 58,000 | $ (326,000) |  |  |
Investments [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gain on equity securities, net |  |  | 241,000 | $ (33,000) |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Alternative Investment | $ 12,400,000 |  | $ 12,400,000 |  | $ 11,000,000.0

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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 Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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