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Note 4 - Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2020
Notes Tables |
Comprehensive Income (Loss) [Table Text Block] |
|  | Before-Tax |  |  | Income Tax |  |  | Net-of-Tax |
|  | Amount |  |  | Effect |  |  | Amount |
Three Months Ended March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income from available-for-sale debt securities, Unrealized holding gains on available-for-sale debt securities |  | $ | 7,240 |  |  | $ | (1,521 | ) |  | $ | 5,719 |
Unfunded pension and postretirement obligations: |  |  |  |  |  |  |  |  |  |  |  |
Changes from plan amendments and actuarial gains and losses |  |  | 88 |  |  |  | (18 | ) |  |  | 70 |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost |  |  | (8 | ) |  |  | 2 |  |  |  | (6 | )
Other comprehensive income on unfunded retirement obligations |  |  | 80 |  |  |  | (16 | ) |  |  | 64 |
Total other comprehensive income |  | $ | 7,320 |  |  | $ | (1,537 | ) |  | $ | 5,783 |
|  | Before-Tax |  |  | Income Tax |  |  | Net-of-Tax |
|  | Amount |  |  | Effect |  |  | Amount |
Three Months Ended March 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income from available-for-sale debt securities, Unrealized holding gains on available-for-sale securities |  | $ | 4,261 |  |  | $ | (895 | ) |  | $ | 3,366 |
Unfunded pension and postretirement obligations: |  |  |  |  |  |  |  |  |  |  |  |
Changes from plan amendments and actuarial gains and losses included in other comprehensive income |  |  | 214 |  |  |  | (45 | ) |  |  | 169 |
Amortization of prior service cost and net actuarial loss included in net periodic benefit cost |  |  | (8 | ) |  |  | 2 |  |  |  | (6 | )
Other comprehensive income on unfunded retirement obligations |  |  | 206 |  |  |  | (43 | ) |  |  | 163 |
Total other comprehensive income |  | $ | 4,467 |  |  | $ | (938 | ) |  | $ | 3,529 |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Unrealized |  |  |  |  |  |  | Accumulated |
|  | Gains |  |  | Unfunded |  |  | Other |
|  | (Losses) |  |  | Retirement |  |  | Comprehensive |
|  | on Securities |  |  | Obligations |  |  | Income (Loss) |
Three Months Ended March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ | 3,511 |  |  | $ | 180 |  |  | $ | 3,691 |
Other comprehensive income during three months ended March 31, 2020 |  |  | 5,719 |  |  |  | 64 |  |  |  | 5,783 |
Balance, end of period |  | $ | 9,230 |  |  | $ | 244 |  |  | $ | 9,474 |
Three Months Ended March 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ | (4,307 | ) |  | $ | 137 |  |  | $ | (4,170 | )
Other comprehensive income during three months ended March 31, 2019 |  |  | 3,366 |  |  |  | 163 |  |  |  | 3,529 |
Balance, end of period |  | $ | (941 | ) |  | $ | 300 |  |  | $ | (641 | )
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] |
|  | Reclassified from |  |
|  | Accumulated Other |  |
Details about Accumulated Other |  | Comprehensive |  | Affected Line Item in the Consolidated
Comprehensive Income Components |  | Income |  | Statements of Income
Amortization of defined benefit pension and postretirement items: |  |  |  |  |
Prior service cost |  |  | (8 | ) | Other noninterest expense
|  |  | 2 |  | Income tax provision
Total reclassifications for the period |  | $ | (6 | ) |
|  | Reclassified from |  |
|  | Accumulated Other |  |
Details about Accumulated Other |  | Comprehensive |  | Affected Line Item in the Consolidated
Comprehensive Income (Loss) Components |  | Income (Loss) |  | Statements of Income
Amortization of defined benefit pension and postretirement items: |  |  |  |  |
Prior service cost |  |  | (8 | ) | Other noninterest expense
|  |  | 2 |  | Income tax provision
Total reclassifications for the period |  | $ | (6 | ) |

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