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Securities (Narrative) (Details) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) security $ / shares shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) security
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Private mortgage-backed security fair value | $ 900,000 |  | $ 1,000,000
Number of securities held in an unrealized loss position | security | 171 |  | 69
Impairment charges on available for sale securities |  | $ 0 |
Impairment charges on held to maturity securities |  | $ 0 |
Investment securities, pledged as collateral for public deposits | $ 861,827,000 |  | $ 630,303,000
FHLB stock and FRB stock, cost | 21,735,000 |  | 23,526,000
FHLB, cost | 3,970,000 |  | 5,855,000
FRB stock | $ 17,765,000 |  | $ 17,671,000
Visa, Inc | Common Class B |  |  |
Debt and Equity Securities, FV-NI [Line Items] |  |  |
Stock owned (in shares) | shares | 12,356 |  |
Investment without readily determinable fair value | $ 0 |  |
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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