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Securities (Tables) | 6 Months Ended
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Jun. 30, 2024
Securities |
Schedule of amortized cost and fair values, together with gross unrealized gains and losses of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Gross |  | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
Available-for-sale Securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
June 30, 2024: |  | ​ |  |  | ​ |  |  | ​ |  | ​ | ​ |
U.S. government agencies | ​ | $ | 22,500 | ​ | $ | — | ​ | $ | (415) | ​ | $ | 22,085
State and municipal obligations | ​ | ​ | 202,312 | ​ | ​ | 256 | ​ | ​ | (9,959) | ​ | ​ | 192,609
Subordinated notes | ​ |  | 28,970 | ​ | ​ | — | ​ | ​ | (3,540) | ​ | ​ | 25,430
Total debt securities | ​ | $ | 253,782 | ​ | $ | 256 | ​ | $ | (13,914) | ​ | $ | 240,124
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ |  | Gross |  | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
Available-for-sale Securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
December 31, 2023: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. government agencies | ​ | $ | 45,000 | ​ | $ | — | ​ | $ | (732) | ​ | $ | 44,268
State and municipal obligations | ​ | ​ | 177,670 | ​ | ​ | 2,264 | ​ | ​ | (5,742) | ​ | ​ | 174,192
Subordinated notes | ​ | ​ | 29,013 | ​ | ​ | — | ​ | ​ | (4,713) | ​ | ​ | 24,300
Total debt securities | ​ | $ | 251,683 | ​ | $ | 2,264 | ​ | $ | (11,187) | ​ | $ | 242,760
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Schedule of amortized cost and fair value of available-for-sale securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Fair
​ |  | Cost |  | Value
​ | ​ | (In thousands)
Under 1 year | ​ | $ | 10,000 | ​ | $ | 9,947
One to five years | ​ |  | 15,070 | ​ | ​ | 14,643
Five to ten years | ​ |  | 29,569 | ​ | ​ | 25,774
Over ten years | ​ |  | 199,143 | ​ | ​ | 189,760
Totals | ​ | $ | 253,782 | ​ | $ | 240,124
​
Schedule of investments' gross unrealized losses and fair value, aggregated by investment category and length of time | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
Description of | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized
Securities |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
​ |  | (In thousands)
U.S. Government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 22,085 | ​ | $ | (415) | ​ | $ | 22,085 | ​ | $ | (415)
State and municipal obligations | ​ | ​ | 119,745 | ​ | ​ | (1,762) | ​ | ​ | 48,104 | ​ | ​ | (8,197) | ​ | ​ | 167,849 | ​ | ​ | (9,959)
Subordinated notes | ​ | ​ | 4,325 | ​ | ​ | (175) | ​ | ​ | 21,105 | ​ | ​ | (3,365) | ​ | ​ | 25,430 | ​ | ​ | (3,540)
Total temporarily impaired securities | ​ | $ | 124,070 | ​ | $ | (1,937) | ​ | $ | 91,294 | ​ | $ | (11,977) | ​ | $ | 215,364 | ​ | $ | (13,914)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
Description of | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | Unrealized
Securities |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
​ |  | (In thousands)
US government agencies | ​ | $ | — | ​ | $ | — | ​ | $ | 44,268 | ​ | $ | (732) | ​ | $ | 44,268 | ​ | $ | (732)
Subordinated notes | ​ | ​ | 3,717 | ​ | ​ | (799) | ​ | ​ | 20,583 | ​ | ​ | (3,914) | ​ | ​ | 24,300 | ​ | ​ | (4,713)
State and municipal obligations | ​ | ​ | 3,365 | ​ | ​ | (12) | ​ | ​ | 51,163 | ​ | ​ | (5,730) | ​ | ​ | 54,528 | ​ | ​ | (5,742)
Total temporarily impaired securities | ​ | $ | 7,082 | ​ | $ | (811) | ​ | $ | 116,014 | ​ | $ | (10,376) | ​ | $ | 123,096 | ​ | $ | (11,187)

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