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AFS Securities (Tables) | 3 Months Ended
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Mar. 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 at:
| March 31, 2021
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury | $ | 29,484 |  |  | $ | — |  |  | $ | 113 |  |  | $ | 29,371 |
States and political subdivisions | 136,261 |  |  | 4,133 |  |  | 65 |  |  | 140,329 |
Auction rate money market preferred | 3,200 |  |  | 24 |  |  | — |  |  | 3,224 |
Mortgage-backed securities | 73,687 |  |  | 2,148 |  |  | — |  |  | 75,835 |
Collateralized mortgage obligations | 113,275 |  |  | 3,593 |  |  | 3 |  |  | 116,865 |
Corporate | 1,700 |  |  | — |  |  | — |  |  | 1,700 |
Total | $ | 357,607 |  |  | $ | 9,898 |  |  | $ | 181 |  |  | $ | 367,324 |
| 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 |
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 March 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 | $ | — |  |  | $ | 19,774 |  |  | $ | 9,710 |  |  | $ | — |  |  | $ | — |  |  | $ | 29,484 |
States and political subdivisions | 22,079 |  |  | 63,279 |  |  | 23,655 |  |  | 27,248 |  |  | — |  |  | 136,261 |
Auction rate money market preferred | — |  |  | — |  |  | — |  |  | — |  |  | 3,200 |  |  | 3,200 |
Mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  | 73,687 |  |  | 73,687 |
Collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 113,275 |  |  | 113,275 |
Corporate | — |  |  | — |  |  | 1,700 |  |  | — |  |  | — |  |  | 1,700 |
Total amortized cost | $ | 22,079 |  |  | $ | 83,053 |  |  | $ | 35,065 |  |  | $ | 27,248 |  |  | $ | 190,162 |  |  | $ | 357,607 |
Fair value | $ | 22,137 |  |  | $ | 84,508 |  |  | $ | 36,247 |  |  | $ | 28,508 |  |  | $ | 195,924 |  |  | $ | 367,324 |
Schedule of Realized Gain (Loss) [Table Text Block] | A summary of the sales activity of AFS securities was as follows for the:
|  |  | Three Months Ended March 31
|  |  |  |  | 2021 |  | 2020
Proceeds from sales of AFS securities |  |  |  |  | $ | — |  |  | $ | 26,855 |
Realized gains (losses) |  |  |  |  | $ | — |  |  | $ | 71 |
Applicable income tax expense (benefit) |  |  |  |  | $ | — |  |  | $ | 15 |
Available-for-sale securities with gross unrealized losses | The following information pertains to AFS securities with gross unrealized losses at March 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.
| March 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 | $ | 113 |  |  | $ | 29,370 |  |  | $ | — |  |  | $ | — |  |  | $ | 113 |
States and political subdivisions | 65 |  |  | 5,442 |  |  | — |  |  | — |  |  | 65 |
Collateralized mortgage obligations | 3 |  |  | 10,023 |  |  | — |  |  | — |  |  | 3 |
Total | $ | 181 |  |  | $ | 44,835 |  |  | $ | — |  |  | $ | — |  |  | $ | 181 |
Number of securities in an unrealized loss position: |  |  | 6 |  |  |  |  | — |  |  | 6 |

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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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