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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2024
SECURITIES |
Schedule of amortized cost and fair value of investments classified as available-for-sale | The fair value of securities available-for-sale and related gross unrealized gains and losses recognized in accumulated other comprehensive income were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(Dollar amounts in thousands) | ​ | Cost |  | Gains |  | Losses |  | Fair Value
U.S. Government agencies | ​ | $ | 90,649 | ​ | $ | 3 | ​ | $ | (11,670) | ​ | $ | 78,982
Mortgage Backed Securities - residential | ​ | ​ | 630,556 | ​ | ​ | 15 | ​ | ​ | (89,251) | ​ | ​ | 541,320
Mortgage Backed Securities - commercial |  | ​ | 14,182 |  | ​ | 2 |  | ​ | (523) |  | ​ | 13,661
Collateralized mortgage obligations |  | ​ | 190,552 |  | ​ | 29 |  | ​ | (27,555) |  | ​ | 163,026
State and municipal obligations |  | ​ | 394,696 |  | ​ | 171 |  | ​ | (34,539) |  | ​ | 360,328
Municipal taxable |  | ​ | 41,162 |  | ​ | 11 |  | ​ | (5,396) |  | ​ | 35,777
Collateralized debt obligations |  | ​ | — |  | ​ | 2,896 |  | ​ | — |  | ​ | 2,896
TOTAL | ​ | $ | 1,361,797 | ​ | $ | 3,127 | ​ | $ | (168,934) | ​ | $ | 1,195,990
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(Dollar amounts in thousands) | ​ | Cost |  | Gains |  | Losses |  | Fair Value
U.S. Government agencies | ​ | $ | 102,978 | ​ | $ | 4 | ​ | $ | (11,542) | ​ | $ | 91,440
Mortgage Backed Securities-residential | ​ | ​ | 653,507 | ​ | ​ | 53 | ​ | ​ | (83,675) | ​ | ​ | 569,885
Mortgage Backed Securities-commercial |  | ​ | 7,919 |  | ​ | — |  | ​ | (436) |  | ​ | 7,483
Collateralized mortgage obligations |  | ​ | 209,398 |  | ​ | 6 |  | ​ | (28,575) |  | ​ | 180,829
State and municipal obligations |  | ​ | 397,413 |  | ​ | 1,407 |  | ​ | (28,009) |  | ​ | 370,811
Municipal taxable |  | ​ | 39,872 |  | ​ | 12 |  | ​ | (5,599) |  | ​ | 34,285
U.S. Treasury |  | ​ | 1,411 |  | ​ | — |  | ​ | (9) |  | ​ | 1,402
Collateralized debt obligations |  | ​ | — |  | ​ | 3,002 |  | ​ | — |  | ​ | 3,002
TOTAL | ​ | $ | 1,412,498 | ​ | $ | 4,484 | ​ | $ | (157,845) | ​ | $ | 1,259,137
Schedule of gross gain and loss realized | Below is a summary of the gross gains and losses realized by the Corporation on investment sales and calls during the years ended December 31, 2024, 2023 and 2022, respectively. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollar amounts in thousands) |  | ​ | 2024 |  | ​ | 2023 |  | ​ | 2022
Proceeds | ​ | $ | 11,419 | ​ | $ | 330 | ​ | $ | 1,565
Gross gains |  | ​ | 133 |  | ​ | 1 |  | ​ | 6
Gross losses |  | ​ | (30) |  | ​ | (2) |  | ​ | (3)
Schedule of contractual maturities of debt securities | Contractual maturities of debt securities at year-end 2024 were as follows. Securities not due at a single maturity or with no maturity date, primarily mortgage-backed and collateralized mortgage obligations, are shown separately. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Available-for-Sale
​ | ​ | Amortized | ​ | Fair
(Dollar amounts in thousands) |  | Cost |  | Value
Due in one year or less | ​ | $ | 8,256 | ​ | $ | 8,135
Due after one but within five years | ​ | ​ | 45,469 | ​ | ​ | 44,008
Due after five but within ten years |  | ​ | 121,980 |  | ​ | 117,935
Due after ten years |  | ​ | 350,802 |  | ​ | 307,905
​ |  | ​ | 526,507 |  | ​ | 477,983
Mortgage-backed securities and collateralized mortgage obligations |  | ​ | 835,290 |  | ​ | 718,007
TOTAL | ​ | $ | 1,361,797 | ​ | $ | 1,195,990
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position | The following tables show the securities’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position, at December 31, 2024 and 2023. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024
​ | ​ | Less Than 12 Months |  | More Than 12 Months |  | Total
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized
(Dollar amounts in thousands) | ​ | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
U.S. Government agencies | ​ | $ | 3,696 | ​ | $ | (107) | ​ | $ | 74,636 | ​ | $ | (11,563) | ​ | $ | 78,332 | ​ | $ | (11,670)
Mortgage Backed Securities - Residential |  | ​ | 51,996 | ​ | ​ | (1,113) | ​ | ​ | 481,270 | ​ | ​ | (88,138) | ​ | ​ | 533,266 | ​ | ​ | (89,251)
Mortgage Backed Securities - Commercial | ​ | ​ | 6,937 | ​ | ​ | (161) | ​ | ​ | 5,388 | ​ | ​ | (362) | ​ | ​ | 12,325 | ​ | ​ | (523)
Collateralized mortgage obligations |  | ​ | 85 |  | ​ | — |  | ​ | 158,244 |  | ​ | (27,555) |  | ​ | 158,329 |  | ​ | (27,555)
State and municipal obligations |  | ​ | 89,321 | ​ | ​ | (953) | ​ | ​ | 232,247 | ​ | ​ | (33,586) | ​ | ​ | 321,568 | ​ | ​ | (34,539)
Municipal taxable |  | ​ | 1,587 |  | ​ | (20) |  | ​ | 31,918 |  | ​ | (5,376) |  | ​ | 33,505 |  | ​ | (5,396)
U.S. Treasury |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | — |  | ​ | —
Total temporarily impaired securities | ​ | $ | 153,622 | ​ | $ | (2,354) | ​ | $ | 983,703 | ​ | $ | (166,580) | ​ | $ | 1,137,325 | ​ | $ | (168,934)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023
​ | ​ | Less Than 12 Months |  | More Than 12 Months |  | Total
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized
(Dollar amounts in thousands) |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
U.S. Government agencies | ​ | $ | 3,757 | ​ | $ | (73) | ​ | $ | 87,291 | ​ | $ | (11,469) | ​ | $ | 91,048 | ​ | $ | (11,542)
Mortgage Backed Securities - Residential | ​ | ​ | 3,810 | ​ | ​ | (41) | ​ | ​ | 556,414 | ​ | ​ | (83,634) |  | ​ | 560,224 |  | ​ | (83,675)
Mortgage Backed Securities - Commercial | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,483 | ​ | ​ | (436) | ​ | ​ | 7,483 | ​ | ​ | (436)
Collateralized mortgage obligations |  | ​ | 12,981 |  | ​ | (303) |  | ​ | 164,871 |  | ​ | (28,272) |  | ​ | 177,852 |  | ​ | (28,575)
State and municipal obligations | ​ | ​ | 45,154 | ​ | ​ | (319) | ​ | ​ | 212,022 | ​ | ​ | (27,690) |  | ​ | 257,176 |  | ​ | (28,009)
Municipal taxable |  | ​ | — |  | ​ | — |  | ​ | 31,958 |  | ​ | (5,599) |  | ​ | 31,958 |  | ​ | (5,599)
U.S. Treasury |  | ​ | 1,402 |  | ​ | (9) |  | ​ | — |  | ​ | — |  | ​ | 1,402 |  | ​ | (9)
Total temporarily impaired securities | ​ | $ | 67,104 | ​ | $ | (745) | ​ | $ | 1,060,039 | ​ | $ | (157,100) | ​ | $ | 1,127,143 | ​ | $ | (157,845)
Schedule of credit losses recognized in earnings | The table below presents a rollforward of the credit losses recognized in earnings for the years presented: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended December 31, | ​ | Year Ended December 31, | ​
(Dollar amounts in thousands) |  | 2024 |  | 2023 | ​ | 2024 |  | 2023 | ​
Beginning balance | ​ | $ | 2,974 | ​ | $ | 2,974 | ​ | $ | 2,974 | ​ | $ | 2,974 | ​
Reductions for securities called during the period |  | ​ | — |  | ​ | — | ​ | ​ | — |  | ​ | — | ​
Ending balance | ​ | $ | 2,974 | ​ | $ | 2,974 | ​ | $ | 2,974 | ​ | $ | 2,974 | ​
​

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