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Securities, Gains (Loss) on Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Security | Sep. 30, 2020 USD ($) Security | Dec. 31, 2020 USD ($)
Gains (Loss) on Sales of Securities [Abstract} |  |  |  |  |
Net securities gain | $ (62) | $ 142 | $ 50 | $ 1,328 |
Realized pre-tax gain on sales and calls of AFS securities |  | 23 | 62 | 1,000 |
Realized pre-tax loss on sales and calls of AFS securities |  |  | 2 |  |
Unrealized (loss) gain from fair market value adjustment of equity securities | (62) | 119 | (10) | $ 259 |
Equity securities at fair value | 2,461 |  | 2,461 |  | $ 2,471
Securities pledged as collateral to secure public deposit and for other purposes | 434,400 |  | 434,400 |  | 354,500
Amortized cost of securities sold under agreements to repurchase | 389,200 |  | 389,200 |  | $ 386,600
Visa Class B Restricted Stock [Member] |  |  |  |  |
Gains (Loss) on Sales of Securities [Abstract} |  |  |  |  |
Equity securities at fair value | 2,500 |  | $ 2,500 |  |
Increase (Decrease) in fair market value of equity securities | $ (62) | $ 119 |  |  |
Number of equity securities sold (in shares) | Security |  |  | 0 | 0 |

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