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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale | The amortized cost and estimated fair value of securities available-for-sale along with allowance for credit losses, gross unrealized gains and losses are summarized as follows:
(dollars in thousands) Securities available-for-sale | Amortized Cost |  | Allowance for Credit Losses |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2024 |  |  |  |  |  |  |  |  |
U.S. Treasuries | $ | 800,860 |  |  | $ | — |  |  | $ | 669 |  |  | $ | (5,065) |  |  | $ | 796,464 |
U.S. government-sponsored agencies | 1,010 |  |  | — |  |  | — |  |  | (16) |  |  | 994 |
State, county and municipal securities | 25,802 |  |  | — |  |  | 8 |  |  | (1,070) |  |  | 24,740 |
Corporate debt securities | 10,946 |  |  | (69) |  |  | — |  |  | (594) |  |  | 10,283 |
SBA pool securities | 72,036 |  |  | — |  |  | — |  |  | (1,554) |  |  | 70,482 |
Mortgage-backed securities | 797,542 |  |  | — |  |  | 1,494 |  |  | (30,739) |  |  | 768,297 |
Total debt securities available-for-sale | $ | 1,708,196 |  |  | $ | (69) |  |  | $ | 2,171 |  |  | $ | (39,038) |  |  | $ | 1,671,260 |
December 31, 2023 |  |  |  |  |  |  |  |  |
U.S. Treasuries | $ | 732,636 |  |  | $ | — |  |  | $ | 34 |  |  | $ | (11,793) |  |  | $ | 720,877 |
U.S. government-sponsored agencies | 1,023 |  |  | — |  |  | — |  |  | (38) |  |  | 985 |
State, county and municipal securities | 28,986 |  |  | — |  |  | 9 |  |  | (944) |  |  | 28,051 |
Corporate debt securities | 10,946 |  |  | (69) |  |  | — |  |  | (850) |  |  | 10,027 |
SBA pool securities | 53,033 |  |  | — |  |  | 2 |  |  | (1,519) |  |  | 51,516 |
Mortgage-backed securities | 621,013 |  |  | — |  |  | 67 |  |  | (29,592) |  |  | 591,488 |
Total debt securities available-for-sale | $ | 1,447,637 |  |  | $ | (69) |  |  | $ | 112 |  |  | $ | (44,736) |  |  | $ | 1,402,944 |
The following table is a summary of sales activities in the Company's investment securities available for sale:
| For the Years Ended December 31,
(dollars in thousands) | 2024 |  | 2023 |  | 2022
Gross losses on sales of securities | $ | — |  |  | $ | (310) |  |  | $ | — |
Net realized losses on sales of securities available for sale | $ | — |  |  | $ | (310) |  |  | $ | — |
Sales proceeds | $ | — |  |  | $ | 5,141 |  |  | $ | — |
Schedule of Amortized Cost and Estimated Fair Value of Debt Securities Held-to-Maturity | The amortized cost and estimated fair value of securities held-to-maturity along with gross unrealized gains and losses are summarized as follows:
(dollars in thousands) Securities held-to-maturity |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2024 |  |  |  |  |  |  |  |
State, county and municipal securities |  | $ | 33,623 |  |  | $ | — |  |  | $ | (6,214) |  |  | $ | 27,409 |
Mortgage-backed securities |  | 131,054 |  |  | 80 |  |  | (14,515) |  |  | 116,619 |
Total debt securities held-to-maturity |  | $ | 164,677 |  |  | $ | 80 |  |  | $ | (20,729) |  |  | $ | 144,028 |
December 31, 2023 |  |  |  |  |  |  |  |
State, county and municipal securities |  | $ | 31,905 |  |  | $ | — |  |  | $ | (5,051) |  |  | $ | 26,854 |
Mortgage-backed securities |  | 109,607 |  |  | — |  |  | (13,730) |  |  | 95,877 |
Total debt securities held-to-maturity |  | $ | 141,512 |  |  | $ | — |  |  | $ | (18,781) |  |  | $ | 122,731 |
Schedule of Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity | The amortized cost and estimated fair value of debt securities available-for-sale and held-to-maturity as of December 31, 2024, by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without penalty. Therefore, these securities are not included in the maturity categories in the following maturity summary.
| Available-for-Sale |  | Held-to-Maturity
(dollars in thousands) | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 309,442 |  |  | $ | 307,875 |  |  | $ | — |  |  | $ | — |
Due from one year to five years | 474,765 |  |  | 471,711 |  |  | — |  |  | — |
Due from five to ten years | 115,347 |  |  | 113,511 |  |  | — |  |  | — |
Due after ten years | 11,100 |  |  | 9,866 |  |  | 33,623 |  |  | 27,409 |
Mortgage-backed securities | 797,542 |  |  | 768,297 |  |  | 131,054 |  |  | 116,619 |
| $ | 1,708,196 |  |  | $ | 1,671,260 |  |  | $ | 164,677 |  |  | $ | 144,028 |
Schedule of Gross Unrealized Losses and Fair Value of Securities | The following table shows the gross unrealized losses and estimated fair value of available-for-sale securities aggregated by category and length of time that securities have been in a continuous unrealized loss position at December 31, 2024 and 2023.
|  | Less Than 12 Months |  | 12 Months or More |  | Total
(dollars in thousands) Securities available-for-sale |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 272,564 |  |  | $ | (1,376) |  |  | $ | 353,787 |  |  | $ | (3,689) |  |  | $ | 626,351 |  |  | $ | (5,065) |
U.S. government-sponsored agencies |  | — |  |  | — |  |  | 994 |  |  | (16) |  |  | 994 |  |  | (16) |
State, county and municipal securities |  | 3,953 |  |  | (17) |  |  | 15,940 |  |  | (1,053) |  |  | 19,893 |  |  | (1,070) |
Corporate debt securities |  | 383 |  |  | (13) |  |  | 8,400 |  |  | (581) |  |  | 8,783 |  |  | (594) |
SBA pool securities |  | 52,850 |  |  | (322) |  |  | 17,491 |  |  | (1,232) |  |  | 70,341 |  |  | (1,554) |
Mortgage-backed securities |  | 177,438 |  |  | (1,968) |  |  | 481,617 |  |  | (28,771) |  |  | 659,055 |  |  | (30,739) |
Total debt securities |  | $ | 507,188 |  |  | $ | (3,696) |  |  | $ | 878,229 |  |  | $ | (35,342) |  |  | $ | 1,385,417 |  |  | $ | (39,038) |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 159,667 |  |  | $ | (827) |  |  | $ | 537,313 |  |  | $ | (10,966) |  |  | $ | 696,980 |  |  | $ | (11,793) |
U. S. government sponsored agencies |  | — |  |  | — |  |  | 985 |  |  | (38) |  |  | 985 |  |  | (38) |
State, county and municipal securities |  | 1,923 |  |  | — |  |  | 19,754 |  |  | (944) |  |  | 21,677 |  |  | (944) |
Corporate debt securities |  | 500 |  |  | — |  |  | 8,527 |  |  | (850) |  |  | 9,027 |  |  | (850) |
SBA pool securities |  | 42 |  |  | — |  |  | 21,267 |  |  | (1,519) |  |  | 21,309 |  |  | (1,519) |
Mortgage-backed securities |  | 126 |  |  | — |  |  | 566,707 |  |  | (29,592) |  |  | 566,833 |  |  | (29,592) |
Total debt securities |  | $ | 162,258 |  |  | $ | (827) |  |  | $ | 1,154,553 |  |  | $ | (43,909) |  |  | $ | 1,316,811 |  |  | $ | (44,736) |
Schedule of Held-to-Maturity Securities with Unrealized Losses | The following table shows the gross unrealized losses and estimated fair value of held-to-maturity securities aggregated by category and length of time that securities have been in a continuous unrealized loss position at December 31, 2024 and 2023:
|  | Less Than 12 Months |  | 12 Months or More |  | Total
(dollars in thousands) Securities held-to-maturity |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
State, county and municipal securities |  | $ | 1,702 |  |  | $ | (49) |  |  | $ | 25,707 |  |  | $ | (6,165) |  |  | $ | 27,409 |  |  | $ | (6,214) |
Mortgage-backed securities |  | 22,710 |  |  | (848) |  |  | 79,366 |  |  | (13,667) |  |  | 102,076 |  |  | (14,515) |
Total debt securities held-to-maturity |  | $ | 24,412 |  |  | $ | (897) |  |  | $ | 105,073 |  |  | $ | (19,832) |  |  | $ | 129,485 |  |  | $ | (20,729) |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
State, county and municipal securities |  | $ | — |  |  | $ | — |  |  | $ | 26,854 |  |  | $ | (5,051) |  |  | $ | 26,854 |  |  | $ | (5,051) |
Mortgage-backed securities |  | 13,612 |  |  | (227) |  |  | 82,265 |  |  | (13,503) |  |  | 95,877 |  |  | (13,730) |
Total debt securities held-to-maturity |  | $ | 13,612 |  |  | $ | (227) |  |  | $ | 109,119 |  |  | $ | (18,554) |  |  | $ | 122,731 |  |  | $ | (18,781) |
Schedule of Investments Available-for-sale, Allowance for Credit Loss | The remaining $39.0 million in unrealized loss was determined to be from factors other than credit, primarily changes in market interest rates.
| For the Years Ended December 31,
(dollars in thousands) | 2024 |  | 2023 |  | 2022
Allowance for credit losses |  |  |  |  |
Beginning balance | $ | 69 |  |  | $ | 75 |  |  | $ | — |
Current-period provision for expected credit losses | — |  |  | (6) |  |  | 75 |
Ending balance | $ | 69 |  |  | $ | 69 |  |  | $ | 75 |
Schedule of Gain (Loss) on Investments | Net gain on securities reported on the consolidated statements of income is comprised of the following:
| For the Years Ended December 31,
(dollars in thousands) | 2024 |  | 2023 |  | 2022
Net realized losses on sales of securities available-for-sale | $ | — |  |  | $ | (310) |  |  | $ | — |
Unrealized holding gains (losses) on equity securities | (10) |  |  | 6 |  |  | (67) |
Net realized gains on sales of other investments | 12,314 |  |  | — |  |  | 270 |
Net gain (loss) on securities | $ | 12,304 |  |  | $ | (304) |  |  | $ | 203 |

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