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Securities, Gains (Loss) on Securities, Securities Pledged, and Securities Sold Under Agreements to Repurchase (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2008
Gains (Loss) on Sales of Securities [Abstract} |  |  |  |  |  |
Net securities gain (loss) | $ 204 | $ 2 | $ 560 | $ (286) |  |
Net gain (loss) realized on sales and calls of AFS securities | 5 | 2 | 6 | (286) |  |
Realized pre-tax gain on sales and calls of AFS securities | 78 | 3 | 79 | 284 |  |
Realized pre-tax loss on sales and calls of AFS securities | 73 | $ 1 | 73 | $ 570 |  |
Unrealized gain from equity securities | 199 |  | 554 |  |  |
Equity securities at fair value | 1,727 |  | 1,727 |  | $ 1,173 |
Securities pledged as collateral to secure public deposit and for other purposes | 238,500 |  | 238,500 |  | 258,800 |
Amortized cost of securities sold under agreements to repurchase | 272,200 |  | 272,200 |  | 289,100 |
Class B Restricted Stock [Member] |  |  |  |  |  |
Gains (Loss) on Sales of Securities [Abstract} |  |  |  |  |  |
Number of shares of stock acquired (in shares) |  |  |  |  |  | 9,918
Gain on recognition of fair value of equity securities |  |  |  |  | $ 1,200 |
Number of shares held in portfolio (in shares) |  |  |  |  | 9,918 |
Equity securities at fair value | $ 1,700 |  | $ 1,700 |  |  |

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