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INVESTMENT SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Amortized Cost and Estimated Fair Value of Debt Securities Available for Sale | The amortized cost and estimated fair value of securities available-for-sale along with 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
March 31, 2024 |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 712,985 |  |  | $ | — |  |  | $ | 8 |  |  | $ | (11,697) |  |  | $ | 701,296 |
U.S. government-sponsored agencies |  | 1,020 |  |  | — |  |  | — |  |  | (40) |  |  | 980 |
State, county and municipal securities |  | 28,136 |  |  | — |  |  | 5 |  |  | (1,137) |  |  | 27,004 |
Corporate debt securities |  | 10,946 |  |  | (73) |  |  | — |  |  | (859) |  |  | 10,014 |
SBA pool securities |  | 80,164 |  |  | — |  |  | 2 |  |  | (1,737) |  |  | 78,429 |
Mortgage-backed securities |  | 631,284 |  |  | — |  |  | 24 |  |  | (34,612) |  |  | 596,696 |
Total debt securities available-for-sale |  | $ | 1,464,535 |  |  | $ | (73) |  |  | $ | 39 |  |  | $ | (50,082) |  |  | $ | 1,414,419 |
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 |
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
March 31, 2024 |  |  |  |  |  |  |  |
State, county and municipal securities |  | $ | 33,668 |  |  | $ | 2 |  |  | $ | (5,693) |  |  | $ | 27,977 |
Mortgage-backed securities |  | 113,354 |  |  | 29 |  |  | (14,779) |  |  | 98,604 |
Total debt securities held-to-maturity |  | $ | 147,022 |  |  | $ | 31 |  |  | $ | (20,472) |  |  | $ | 126,581 |
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 Estimated Fair Value of Debt Securities, Classified by Contractual Maturity Date | The amortized cost and estimated fair value of debt securities available-for-sale and held-to-maturity as of March 31, 2024, by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying these 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 | $ | 306,980 |  |  | $ | 305,330 |  |  | $ | — |  |  | $ | — |
Due from one year to five years | 440,409 |  |  | 429,292 |  |  | — |  |  | — |
Due from five to ten years | 73,709 |  |  | 72,350 |  |  | — |  |  | — |
Due after ten years | 12,153 |  |  | 10,751 |  |  | 33,668 |  |  | 27,977 |
Mortgage-backed securities | 631,284 |  |  | 596,696 |  |  | 113,354 |  |  | 98,604 |
| $ | 1,464,535 |  |  | $ | 1,414,419 |  |  | $ | 147,022 |  |  | $ | 126,581 |
Schedule of Available-for-Sale Securities with Unrealized Losses | 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 March 31, 2024 and December 31, 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
March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  | $ | 133,526 |  |  | $ | (1,129) |  |  | $ | 562,763 |  |  | $ | (10,568) |  |  | $ | 696,289 |  |  | $ | (11,697) |
U.S. government-sponsored agencies |  | — |  |  | — |  |  | 980 |  |  | (40) |  |  | 980 |  |  | (40) |
State, county and municipal securities |  | 5,362 |  |  | (10) |  |  | 19,502 |  |  | (1,127) |  |  | 24,864 |  |  | (1,137) |
Corporate debt securities |  | 499 |  |  | (1) |  |  | 8,515 |  |  | (858) |  |  | 9,014 |  |  | (859) |
SBA pool securities |  | 58,947 |  |  | (147) |  |  | 19,333 |  |  | (1,590) |  |  | 78,280 |  |  | (1,737) |
Mortgage-backed securities |  | 47,179 |  |  | (289) |  |  | 548,200 |  |  | (34,323) |  |  | 595,379 |  |  | (34,612) |
Total debt securities available-for-sale |  | $ | 245,513 |  |  | $ | (1,576) |  |  | $ | 1,159,293 |  |  | $ | (48,506) |  |  | $ | 1,404,806 |  |  | $ | (50,082) |
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 available-for-sale |  | $ | 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 March 31, 2024 and December 31, 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
March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
State, county and municipal securities |  | $ | 453 |  |  | $ | (6) |  |  | $ | 26,217 |  |  | $ | (5,687) |  |  | $ | 26,670 |  |  | $ | (5,693) |
Mortgage-backed securities |  | 8,282 |  |  | (266) |  |  | 85,738 |  |  | (14,513) |  |  | 94,020 |  |  | (14,779) |
Total debt securities held-to-maturity |  | $ | 8,735 |  |  | $ | (272) |  |  | $ | 111,955 |  |  | $ | (20,200) |  |  | $ | 120,690 |  |  | $ | (20,472) |
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 $50.1 million in unrealized loss was determined to be from factors other than credit.
(dollars in thousands) | Three Months Ended March 31, |  |
Allowance for credit losses | 2024 |  | 2023 |  |  |  |
Beginning balance | $ | 69 |  |  | $ | 75 |  |  |  |  |
Provision for other credit losses | 4 |  |  | 7 |  |  |  |  |
Ending balance | $ | 73 |  |  | $ | 82 |  |  |  |  |
Schedule of Gain (Loss) on Investments | Total net gain (loss) on securities reported on the consolidated statements of income and comprehensive income is comprised of the following for the three months ended March 31, 2024 and 2023:
| Three Months Ended March 31, |  |
(dollars in thousands) | 2024 |  | 2023 |  |  |  |
Unrealized holding gains (losses) on equity securities | $ | (7) |  |  | $ | 6 |  |  |  |  |
Net gain (loss) on securities | $ | (7) |  |  | $ | 6 |  |  |  |  |

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