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Securities (Narrative) (Details) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) security $ / shares shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) security
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Private mortgage-backed security fair value | $ 1,000,000.0 |  | $ 1,100,000
Other than temporary impairment losses | $ 0 |  | $ 0
Number of securities held in an unrealized loss position | security | 31 |  | 54
Investment securities, pledged as collateral for public deposits | $ 414,668,000 |  | $ 260,826,000
Proceeds from sales of securities available for sale | 219,697,000 | $ 39,797,000 |
Gain from sales of securities | 8,024,000 | $ 97,000 |
FHLB stock and FRB stock, cost | 23,527,000 |  | 33,380,000
FHLB, cost | 5,855,000 |  | 15,789,000
FRB stock | $ 17,672,000 |  | $ 17,591,000
Visa, Inc | Common Class B |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Stock owned (in shares) | shares | 12,356 |  |
Visa, Inc | Common Class A |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Conversion price (in dollars per share) | $ / shares | $ 1.62 |  |
Conversion of stock (in shares) | shares | 20,051 |  |

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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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