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Securities, Gains (Loss) on Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) Security | Jun. 30, 2020 USD ($) Security | Dec. 31, 2020 USD ($)
Gains (Loss) on Sales of Securities [Abstract} |  |  |  |  |
Net securities gain | $ 280 | $ 937 | $ 112 | $ 1,186 |
Realized pre-tax gain on sales and calls of AFS securities |  | 564 | 60 | 1,100 |
Unrealized gain from fair market value adjustment of equity securities | 280 | 373 | 52 | $ 141 |
Equity securities at fair value | 2,523 |  | 2,523 |  | $ 2,471
Securities pledged as collateral to secure public deposit and for other purposes | 432,800 |  | 432,800 |  | 354,500
Amortized cost of securities sold under agreements to repurchase | 392,300 |  | 392,300 |  | $ 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 in fair market value of equity securities | $ 300 | $ 400 |  |  |
Number of equity securities sold (in shares) | Security |  |  | 0 | 0 |

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