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AFS Securities (Tables) | 6 Months Ended
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Jun. 30, 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:
| June 30, 2021
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. Treasury | $ | 132,291 |  |  | $ | 310 |  |  | $ | 8 |  |  | $ | 132,593 |
States and political subdivisions | 126,002 |  |  | 4,971 |  |  | 13 |  |  | 130,960 |
Auction rate money market preferred | 3,200 |  |  | 60 |  |  | — |  |  | 3,260 |
Mortgage-backed securities | 66,091 |  |  | 2,064 |  |  | — |  |  | 68,155 |
Collateralized mortgage obligations | 105,965 |  |  | 3,332 |  |  | 3 |  |  | 109,294 |
Corporate | 4,200 |  |  | 17 |  |  | 25 |  |  | 4,192 |
Total | $ | 437,749 |  |  | $ | 10,754 |  |  | $ | 49 |  |  | $ | 448,454 |
| 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 June 30, 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 | $ | — |  |  | $ | 91,414 |  |  | $ | 40,877 |  |  | $ | — |  |  | $ | — |  |  | $ | 132,291 |
States and political subdivisions | 21,977 |  |  | 56,225 |  |  | 22,662 |  |  | 25,138 |  |  | — |  |  | 126,002 |
Auction rate money market preferred | — |  |  | — |  |  | — |  |  | — |  |  | 3,200 |  |  | 3,200 |
Mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  | 66,091 |  |  | 66,091 |
Collateralized mortgage obligations | — |  |  | — |  |  | — |  |  | — |  |  | 105,965 |  |  | 105,965 |
Corporate | — |  |  | — |  |  | 4,200 |  |  | — |  |  | — |  |  | 4,200 |
Total amortized cost | $ | 21,977 |  |  | $ | 147,639 |  |  | $ | 67,739 |  |  | $ | 25,138 |  |  | $ | 175,256 |  |  | $ | 437,749 |
Fair value | $ | 22,121 |  |  | $ | 149,934 |  |  | $ | 68,968 |  |  | $ | 26,722 |  |  | $ | 180,709 |  |  | $ | 448,454 |
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 June 30 |  | Six Months Ended June 30
| 2021 |  | 2020 |  | 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 June 30, 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.
| June 30, 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 | $ | 8 |  |  | $ | 19,584 |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |
States and political subdivisions | 13 |  |  | 5,322 |  |  | — |  |  | — |  |  | 13 |
Collateralized mortgage obligations | 3 |  |  | 9,717 |  |  | — |  |  | — |  |  | 3 |
Corporate | 25 |  |  | 2,475 |  |  |  |  |  |  | 25 |
Total | $ | 49 |  |  | $ | 37,098 |  |  | $ | — |  |  | $ | — |  |  | $ | 49 |
Number of securities in an unrealized loss position: |  |  | 13 |  |  |  |  | — |  |  | 13 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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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=123581744&loc=d3e27357-111563 + Details
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