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AFS Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
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:
| 2021
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury | $ | 212,379 |  |  | $ | — |  |  | $ | 2,676 |  |  | $ | 209,703 |
States and political subdivisions | 116,836 |  |  | 4,457 |  |  | 88 |  |  | 121,205 |
Auction rate money market preferred | 3,200 |  |  | 42 |  |  | — |  |  | 3,242 |
Mortgage-backed securities | 54,710 |  |  | 1,438 |  |  | — |  |  | 56,148 |
Collateralized mortgage obligations | 90,435 |  |  | 1,876 |  |  | 10 |  |  | 92,301 |
Corporate | 8,150 |  |  | 19 |  |  | 167 |  |  | 8,002 |
Total | $ | 485,710 |  |  | $ | 7,832 |  |  | $ | 2,941 |  |  | $ | 490,601 |
| 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 |
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, 2021 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
U.S. Treasury | $ | — |  |  | $ | 202,634 |  |  | $ | 9,745 |  |  | $ | — |  |  | $ | — |  |  | $ | 212,379 |
States and political subdivisions | 15,898 |  |  | 54,344 |  |  | 19,351 |  |  | 27,243 |  |  | — |  |  | 116,836 |
Auction rate money market preferred | — |  |  | — |  |  | — |  |  | — |  |  | 3,200 |  |  | 3,200 |
Mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  | 54,710 |  |  | 54,710 |
Collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 90,435 |  |  | 90,435 |
Corporate | — |  |  | — |  |  | 8,150 |  |  | — |  |  | — |  |  | 8,150 |
Total amortized cost | $ | 15,898 |  |  | $ | 256,978 |  |  | $ | 37,246 |  |  | $ | 27,243 |  |  | $ | 148,345 |  |  | $ | 485,710 |
Fair value | $ | 16,039 |  |  | $ | 256,332 |  |  | $ | 37,770 |  |  | $ | 28,769 |  |  | $ | 151,691 |  |  | $ | 490,601 |
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.
| 2021 |  | 2020 |  | 2019
Proceeds from sales of AFS securities | $ | — |  |  | $ | 26,855 |  |  | $ | 33,840 |
Realized gains (losses) | $ | — |  |  | $ | 71 |  |  | $ | 6 |
Applicable income tax expense (benefit) | $ | — |  |  | $ | 15 |  |  | $ | 1 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value | The following information pertains to AFS securities with gross unrealized losses at December 31, 2021 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.
| December 31, 2021
| Less Than Twelve Months |  | Twelve Months or More |  |
| Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Total Unrealized Losses
U.S. Treasury | $ | 2,676 |  |  | $ | 209,703 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,676 |
States and political subdivisions | 88 |  |  | 9,674 |  |  | — |  |  | — |  |  | 88 |
Collateralized mortgage obligations | 10 |  |  | 11,165 |  |  | — |  |  | — |  |  | 10 |
Corporate | 167 |  |  | 6,283 |  |  | — |  |  | — |  |  | 167 |
Total | $ | 2,941 |  |  | $ | 236,825 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,941 |
Number of securities in an unrealized loss position: |  |  | 40 |  |  |  |  | — |  |  | 40 |

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