| Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
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Reclassification |
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Net unrealized |
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adjustment for |
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holding (losses) |
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(gains) losses |
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gains on available |
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realized in income |
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Change in funded status |
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| (In Thousands of Dollars) |
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for sale securities |
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on fair value hedge |
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of post-retirement plan |
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Total |
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| Balance December 31, 2024 |
|
$ |
(192,860 |
) |
|
$ |
(403 |
) |
|
$ |
(2 |
) |
|
$ |
(193,265 |
) |
| Other comprehensive (loss) before reclassification |
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15,096 |
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0 |
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0 |
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15,096 |
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| Amounts reclassified from accumulated other comprehensive income |
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1,054 |
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(186 |
) |
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0 |
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|
868 |
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| Net current period other comprehensive (loss) income |
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16,150 |
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(186 |
) |
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0 |
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15,964 |
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| Balance March 31, 2025 |
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$ |
(176,710 |
) |
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$ |
(589 |
) |
|
$ |
(2 |
) |
|
$ |
(177,301 |
) |
| Other comprehensive (loss) before reclassification |
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|
517 |
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0 |
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0 |
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|
517 |
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| Amounts reclassified from accumulated other comprehensive income |
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0 |
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46 |
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0 |
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46 |
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| Net current period other comprehensive (loss) income |
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|
517 |
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|
46 |
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0 |
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|
563 |
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| Balance June 30, 2025 |
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$ |
(176,193 |
) |
|
$ |
(543 |
) |
|
$ |
(2 |
) |
|
$ |
(176,738 |
) |
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| Balance December 31, 2023 |
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$ |
(171,539 |
) |
|
$ |
(1,013 |
) |
|
$ |
(2 |
) |
|
$ |
(172,554 |
) |
| Other comprehensive income before reclassification |
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(15,149 |
) |
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0 |
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0 |
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(15,149 |
) |
| Amounts reclassified from accumulated other comprehensive (loss) |
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1,686 |
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1,063 |
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0 |
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2,749 |
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| Net current period other comprehensive income |
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(13,463 |
) |
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1,063 |
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0 |
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(12,400 |
) |
| Balance March 31, 2024 |
|
$ |
(185,002 |
) |
|
$ |
50 |
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|
$ |
(2 |
) |
|
$ |
(184,954 |
) |
| Other comprehensive (loss) before reclassification |
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(6,545 |
) |
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0 |
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0 |
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(6,545 |
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| Amounts reclassified from accumulated other comprehensive income |
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|
99 |
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|
167 |
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0 |
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|
266 |
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| Net current period other comprehensive (loss) |
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|
(6,446 |
) |
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|
167 |
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|
0 |
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|
|
(6,279 |
) |
| Balance June 30, 2024 |
|
$ |
(191,448 |
) |
|
$ |
217 |
|
|
$ |
(2 |
) |
|
$ |
(191,233 |
) |
|