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AFS Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Amortized cost and fair value of available-for-sale securities | The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows as of December 31:
| 2020
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
States and political subdivisions | $ | 137,710 |  |  | $ | 5,946 |  |  | $ | — |  |  | $ | 143,656 |
Auction rate money market preferred | 3,200 |  |  | 37 |  |  | — |  |  | 3,237 |
Mortgage-backed securities | 85,926 |  |  | 2,726 |  |  | — |  |  | 88,652 |
Collateralized mortgage obligations | 97,430 |  |  | 4,553 |  |  | — |  |  | 101,983 |
Corporate | 1,700 |  |  | — |  |  | — |  |  | 1,700 |
Total | $ | 325,966 |  |  | $ | 13,262 |  |  | $ | — |  |  | $ | 339,228 |
| 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
States and political subdivisions | $ | 165,005 |  |  | $ | 4,747 |  |  | $ | — |  |  | $ | 169,752 |
Auction rate money market preferred | 3,200 |  |  | — |  |  | 81 |  |  | 3,119 |
Mortgage-backed securities | 139,831 |  |  | 933 |  |  | 560 |  |  | 140,204 |
Collateralized mortgage obligations | 115,944 |  |  | 1,007 |  |  | 187 |  |  | 116,764 |
Total | $ | 423,980 |  |  | $ | 6,687 |  |  | $ | 828 |  |  | $ | 429,839 |
Amortized cost and fair value of available-for-sale securities by contractual maturity | The amortized cost and fair value of AFS securities by contractual maturity at December 31, 2020 are as follows:
| Maturing |  | Securities with Variable Monthly Payments or Noncontractual Maturities |  |
| Due in One Year or Less |  | After One Year But Within Five Years |  | After Five Years But Within Ten Years |  | After Ten Years |  |  | Total
States and political subdivisions | $ | 23,754 |  |  | $ | 63,781 |  |  | $ | 24,055 |  |  | $ | 26,120 |  |  | $ | — |  |  | $ | 137,710 |
Auction rate money market preferred | — |  |  | — |  |  | — |  |  | — |  |  | 3,200 |  |  | 3,200 |
Mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  | 85,926 |  |  | 85,926 |
Collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 97,430 |  |  | 97,430 |
Corporate | — |  |  | — |  |  | 1,700 |  |  | — |  |  | — |  |  | 1,700 |
Total amortized cost | $ | 23,754 |  |  | $ | 63,781 |  |  | $ | 25,755 |  |  | $ | 26,120 |  |  | $ | 186,556 |  |  | $ | 325,966 |
Fair value | $ | 23,922 |  |  | $ | 65,462 |  |  | $ | 26,990 |  |  | $ | 28,982 |  |  | $ | 193,872 |  |  | $ | 339,228 |
Summary of the activity related to sales of available-for-sale securities | A summary of the sales activity of AFS securities during the years ended December 31 is displayed in the following table.
| 2020 |  | 2019 |  | 2018
Proceeds from sales of AFS securities | $ | 26,855 |  |  | $ | 33,840 |  |  | $ | — |
Realized gains (losses) | $ | 71 |  |  | $ | 6 |  |  | $ | — |
Applicable income tax expense (benefit) | $ | 15 |  |  | $ | 1 |  |  | $ | — |
Available-for-sale securities with gross unrealized losses | The following information pertains to AFS securities with gross unrealized losses at December 31 aggregated by investment category and length of time that individual securities have been in a continuous loss position. There were no AFS securities with gross unrealized losses in a continuous loss position at December 31, 2020.
| 2019
| Less Than Twelve Months |  | Twelve Months or More |  |
| Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Total Unrealized Losses
Auction rate money market preferred | — |  |  | — |  |  | 81 |  |  | 3,119 |  |  | 81 |
Mortgage-backed securities | 3 |  |  | 3,974 |  |  | 557 |  |  | 49,701 |  |  | 560 |
Collateralized mortgage obligations | 43 |  |  | 20,262 |  |  | 144 |  |  | 13,309 |  |  | 187 |
Total | $ | 46 |  |  | $ | 24,236 |  |  | $ | 782 |  |  | $ | 66,129 |  |  | $ | 828 |
Number of securities in an unrealized loss position: |  |  | 9 |  |  |  |  | 19 |  |  | 28 |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563 + Details
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