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Securities, Gains (Loss) on Sales of Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Security | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Gains (Loss) on Sales of Securities [Abstract} |  |  |
Net securities gain (loss) | $ 1,769 | $ 783 | $ (85)
Net gain (loss) realized on sales and calls of AFS securities | 1,251 | 3 | (85)
Realized pre-tax gain on sales and calls of AFS securities | 1,500 |  |
Realized pre-tax loss on sales and calls of AFS securities | 200 |  |
Unrealized gain from fair market value adjustment of equity securities | 518 | 780 | $ (0)
Equity securities at fair value | 2,471 | 1,953 |
Securities Pledged as Collateral [Abstract] |  |  |
Securities pledged as collateral to secure public deposit and for other purposes | 354,500 | 239,100 |
Securities Sold under Agreements to Repurchase [Abstract] |  |  |
Amortized cost of securities sold under agreements to repurchase | 386,600 | 261,500 |
Visa Class B Restricted Stock [Member] |  |  |
Gains (Loss) on Sales of Securities [Abstract} |  |  |
Equity securities at fair value | 2,500 |  |
Increase (Decrease) in fair market value of equity securities | $ 500 | $ 800 |
Number of equity securities sold (in shares) | Security | 0 |  |

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