| Schedule of Amortized Cost and Fair Values of Investment Securities |
The following table presents the amortized cost and estimated fair values of investment securities: | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2026 | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
Losses | | Estimated
Fair
Value | | Available for Sale | (dollars in thousands) | | | | | | | | | | | | | | | | | | State and municipal securities | $ | 931,962 | | | $ | 224 | | | $ | (116,231) | | | $ | 815,955 | | | Corporate debt securities | 210,070 | | | 1,596 | | | (4,091) | | | 207,575 | | | Collateralized mortgage obligations | 1,192,896 | | | 3,062 | | | (11,639) | | | 1,184,319 | | | Residential mortgage-backed securities | 786,030 | | | 3,351 | | | (23,853) | | | 765,528 | | | Commercial mortgage-backed securities | 679,928 | | | — | | | (92,255) | | | 587,673 | | | | | | | | | | | Total | $ | 3,800,886 | | | $ | 8,233 | | | $ | (248,069) | | | $ | 3,561,050 | | | | | | | | | | | Held to Maturity | | | | | | | | | Residential mortgage-backed securities | $ | 516,680 | | | $ | 2,936 | | | $ | (44,721) | | | $ | 474,895 | | | Collateralized mortgage obligations | 163,019 | | | — | | | (2,840) | | | 160,179 | | | Commercial mortgage-backed securities | 882,010 | | | — | | | (123,346) | | | 758,664 | | | Total | $ | 1,561,709 | | | $ | 2,936 | | | $ | (170,907) | | | $ | 1,393,738 | |
| | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2025 | | Amortized
Cost | | Gross
Unrealized
Gains | | Gross
Unrealized
Losses | | Estimated
Fair
Value | | Available for Sale | (dollars in thousands) | | | | | | | | | | | | | | | | | | State and municipal securities | $ | 951,764 | | | $ | 326 | | | $ | (125,397) | | | $ | 826,693 | | | Corporate debt securities | 219,699 | | | 1,302 | | | (6,080) | | | 214,921 | | | Collateralized mortgage obligations | 1,034,548 | | | 12,758 | | | (7,228) | | | 1,040,078 | | | Residential mortgage-backed securities | 781,966 | | | 5,891 | | | (21,140) | | | 766,717 | | | Commercial mortgage-backed securities | 647,375 | | | 80 | | | (88,005) | | | 559,450 | | | | | | | | | | | Total | $ | 3,635,352 | | | $ | 20,357 | | | $ | (247,850) | | | $ | 3,407,859 | | | | | | | | | | | | | | | | | | | | | | | | | | | Held to Maturity | | | | | | | | | Residential mortgage-backed securities | $ | 573,636 | | | $ | 4,978 | | | $ | (44,093) | | | $ | 534,521 | | | Commercial mortgage-backed securities | 852,249 | | | — | | | (119,192) | | | 733,057 | | | Total | $ | 1,425,885 | | | $ | 4,978 | | | $ | (163,285) | | | $ | 1,267,578 | |
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| Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities |
The amortized cost and estimated fair values of debt securities as of June 30, 2026, by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities because issuers may have the right to call, or borrowers may have the right to prepay, with or without call or prepayment penalties. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | June 30, 2026 | | | Available for Sale | | Held to Maturity | | | Amortized
Cost | | Estimated
Fair Value | | Amortized
Cost | | Estimated
Fair Value | | (dollars in thousands) | | Due in one year or less | | $ | 6,530 | | | $ | 6,486 | | | $ | — | | | $ | — | | | Due from one year to five years | | 88,012 | | | 87,206 | | | — | | | — | | | Due from five years to ten years | | 221,810 | | | 219,079 | | | — | | | — | | | Due after ten years | | 825,680 | | | 710,759 | | | — | | | — | | | | 1,142,032 | | | 1,023,530 | | | — | | | — | | Residential mortgage-backed securities(1) | | 786,030 | | | 765,528 | | | 516,680 | | | 474,895 | | Commercial mortgage-backed securities(1) | | 679,928 | | | 587,673 | | | 882,010 | | | 758,664 | | Collateralized mortgage obligations(1) | | 1,192,896 | | | 1,184,319 | | | 163,019 | | | 160,179 | | | Total | | $ | 3,800,886 | | | $ | 3,561,050 | | | $ | 1,561,709 | | | $ | 1,393,738 | |
(1) Maturities for mortgage-backed securities and collateralized mortgage obligations are dependent upon the interest rate environment and prepayments on the underlying loans.
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