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Securities | 3 Months Ended
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Mar. 31, 2024
Securities |
Securities | 4. Securities The amortized cost and fair value of the Corporation’s investments are shown below. All securities are classified as available-for-sale. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2024
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(Dollar amounts in thousands) | ​ | Cost |  | Gains |  | Losses |  | Fair Value
U.S. Government agencies | ​ | $ | 100,710 | ​ | $ | 3 | ​ | $ | (12,599) | ​ | $ | 88,114
Mortgage Backed Securities - residential | ​ | ​ | 638,535 | ​ | ​ | 9 | ​ | ​ | (92,745) | ​ | ​ | 545,799
Mortgage Backed Securities - commercial |  | ​ | 7,880 |  | ​ | — |  | ​ | (483) |  | ​ | 7,397
Collateralized mortgage obligations |  | ​ | 204,572 |  | ​ | — |  | ​ | (29,145) |  | ​ | 175,427
State and municipal obligations |  | ​ | 393,628 |  | ​ | 756 |  | ​ | (30,635) |  | ​ | 363,749
Municipal taxable |  | ​ | 39,869 |  | ​ | — |  | ​ | (5,868) |  | ​ | 34,001
U.S. Treasury |  | ​ | 917 |  | ​ | — |  | ​ | (5) |  | ​ | 912
Collateralized debt obligations |  | ​ | — |  | ​ | 2,888 |  | ​ | — |  | ​ | 2,888
TOTAL | ​ | $ | 1,386,111 | ​ | $ | 3,656 | ​ | $ | (171,480) | ​ | $ | 1,218,287
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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
​ Contractual maturities of debt securities at March 31, 2024 were as follows. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Available-for-Sale
​ | ​ | Amortized | ​ | Fair
(Dollar amounts in thousands) |  | Cost |  | Value
Due in one year or less | ​ | $ | 8,551 | ​ | $ | 8,446
Due after one but within five years | ​ | ​ | 43,363 | ​ | ​ | 41,503
Due after five but within ten years |  | ​ | 109,167 |  | ​ | 105,859
Due after ten years |  | ​ | 374,043 |  | ​ | 333,856
​ |  | ​ | 535,124 |  | ​ | 489,664
Mortgage-backed securities and collateralized mortgage obligations |  | ​ | 850,987 |  | ​ | 728,623
TOTAL | ​ | $ | 1,386,111 | ​ | $ | 1,218,287
​ There were no gross gains and losses from investment sales/calls realized by the Corporation for the three months ended March 31, 2024. For the three months ended March 31, 2023 there were no gross gains and losses on sales/calls of investment securities. 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 March 31, 2024 and December 31, 2023. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 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 | ​ | $ | 3,204 | ​ | $ | (107) | ​ | $ | 84,538 | ​ | $ | (12,492) | ​ | $ | 87,742 | ​ | $ | (12,599)
Mortgage Backed Securities - Residential |  | ​ | 12,148 | ​ | ​ | (171) | ​ | ​ | 532,937 | ​ | ​ | (92,574) | ​ | ​ | 545,085 | ​ | ​ | (92,745)
Mortgage Backed Securities - Commercial | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,397 | ​ | ​ | (483) | ​ | ​ | 7,397 | ​ | ​ | (483)
Collateralized mortgage obligations |  | ​ | 15,509 |  | ​ | (423) |  | ​ | 159,918 |  | ​ | (28,722) |  | ​ | 175,427 |  | ​ | (29,145)
State and municipal obligations |  | ​ | 62,809 | ​ | ​ | (375) | ​ | ​ | 228,942 | ​ | ​ | (30,260) | ​ | ​ | 291,751 | ​ | ​ | (30,635)
Municipal taxable |  | ​ | 1,311 |  | ​ | (4) |  | ​ | 31,690 |  | ​ | (5,864) |  | ​ | 33,001 |  | ​ | (5,868)
U.S. Treasury |  | ​ | 912 |  | ​ | (5) |  | ​ | — |  | ​ | — |  | ​ | 912 |  | ​ | (5)
Total temporarily impaired securities | ​ | $ | 95,893 | ​ | $ | (1,085) | ​ | $ | 1,045,422 | ​ | $ | (170,395) | ​ | $ | 1,141,315 | ​ | $ | (171,480)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 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)
​ Management evaluates securities for impairment related to credit losses at least on a quarterly basis, and more frequently when economic or market conditions warrant such an evaluation. The investment securities portfolio is evaluated for impairment related to credit losses by segregating the portfolio into two general segments. In evaluating for impairment, management considers the reason for the decline, the extent of the decline, the duration of the decline and whether the Corporation intends to sell a security or is more likely than not to be required to sell a security before recovery of its amortized cost. If an entity intends to sell or it is more likely than not it will be required to sell the security before recovery of its amortized cost basis, the security’s amortized cost is written down to fair value through income. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, a credit loss exists and an allowance for credit losses is recorded, limited to the amount that the fair value of the security is less than its amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive income, net of applicable taxes. Gross unrealized losses on investment securities were $171.5 million as of March 31, 2024 and $157.8 million as of December 31, 2023. Management believes these losses represent negative adjustments to market value relative to the interest rate environment reflecting the increase in market rates and not losses related to the creditworthiness of the issuer. The portfolio contains primarily government agency, agency backed mortgage backed securities (“MBS”), and collateralized mortgage obligations (“CMO”), which are issued by government sponsored enterprises and are backed by the full faith and credit of the United States government. Secondarily, the Corporation invests in municipal securities issued by state and local governments. Of these, almost half are either insured or contain state enhancements. On the remaining, credit is monitored by the investment committee. Based upon our review of the issuers, we do not believe these investments to be other than temporarily impaired. Management does not intend to sell these securities and it is not more likely than not that we will be required to sell them before their anticipated recovery. ​ The table below presents a rollforward of the credit losses recognized in earnings for the three month period ended March 31, 2024 and 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
(Dollar amounts in thousands) | ​ | 2024 |  | 2023 | ​
Beginning balance | ​ | $ | 2,974 | ​ | $ | 2,974 | ​
Reductions for securities called during the period | ​ | ​ | — |  | ​ | — | ​
Ending balance | ​ | $ | 2,974 | ​ | $ | 2,974 | ​
​

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