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Investments | 3 Months Ended
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Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Investments | INVESTMENTS The following tables present the amortized cost, gross unrealized gains and losses, allowance for credit losses and fair value of securities available for sale and held to maturity:
| March 31, 2024
($ in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 316,638 |  |  | $ | 146 |  |  | $ | (20,982) |  |  | $ | 295,802 |
Obligations of states and political subdivisions | 500,206 |  |  | 41 |  |  | (77,268) |  |  | 422,979 |
Agency mortgage-backed securities | 767,508 |  |  | 393 |  |  | (63,710) |  |  | 704,191 |
U.S. Treasury bills | 184,367 |  |  | 8 |  |  | (3,275) |  |  | 181,100 |
Corporate debt securities | 8,750 |  |  | — |  |  | (939) |  |  | 7,811 |
Total securities available for sale | $ | 1,777,469 |  |  | $ | 588 |  |  | $ | (166,174) |  |  | $ | 1,611,883 |
Held-to-maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 583,972 |  |  | $ | 5,039 |  |  | $ | (53,410) |  |  | $ | 535,601 |
Agency mortgage-backed securities | 51,276 |  |  | — |  |  | (5,779) |  |  | 45,497 |
Corporate debt securities | 123,119 |  |  | 230 |  |  | (9,673) |  |  | 113,676 |
Total securities held-to-maturity | $ | 758,367 |  |  | $ | 5,269 |  |  | $ | (68,862) |  |  | $ | 694,774 |
Allowance for credit losses | (350) |  |  |  |  |  |  |
Total securities held-to-maturity, net | $ | 758,017 |  |  |  |  |  |  |
| December 31, 2023
($ in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 316,511 |  |  | $ | 303 |  |  | $ | (20,368) |  |  | $ | 296,446 |
Obligations of states and political subdivisions | 500,881 |  |  | 57 |  |  | (68,767) |  |  | 432,171 |
Agency mortgage-backed securities | 758,283 |  |  | 1,181 |  |  | (59,083) |  |  | 700,381 |
U.S. Treasury Bills | 184,709 |  |  | 62 |  |  | (3,070) |  |  | 181,701 |
Corporate debt securities | 8,750 |  |  | — |  |  | (1,176) |  |  | 7,574 |
Total securities available for sale | $ | 1,769,134 |  |  | $ | 1,603 |  |  | $ | (152,464) |  |  | $ | 1,618,273 |
Held-to-maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 575,699 |  |  | $ | 7,078 |  |  | $ | (47,461) |  |  | $ | 535,316 |
Agency mortgage-backed securities | 52,100 |  |  | — |  |  | (5,424) |  |  | 46,676 |
Corporate debt securities | 123,420 |  |  | 216 |  |  | (8,981) |  |  | 114,655 |
Total securities held to maturity | $ | 751,219 |  |  | $ | 7,294 |  |  | $ | (61,866) |  |  | $ | 696,647 |
Allowance for credit losses | (785) |  |  |  |  |  |  |
Total securities held-to-maturity, net | $ | 750,434 |  |  |  |  |  |  |
The balance of held-to-maturity securities in the “Amortized Cost” column in the table above includes a cumulative net unamortized unrealized gain of $13.3 million and $14.1 million at March 31, 2024 and December 31, 2023, respectively. Such amounts are amortized over the remaining life of the securities. At March 31, 2024 and December 31, 2023, there were no holdings of securities of any one issuer in an amount greater than 10% of shareholders’ equity, other than U.S. Government agencies and sponsored enterprises. The agency mortgage-backed securities are all issued by U.S. Government agencies and sponsored enterprises. Securities of $1.2 billion and $1.6 billion at March 31, 2024 and December 31, 2023, respectively, were pledged as collateral to secure deposits of public institutions and for other purposes as required by law or contract provisions, in addition to collateral securing borrowing bases with the FHLB and the Federal Reserve. The amortized cost and estimated fair value of debt securities at March 31, 2024, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately five years.
| Available for sale |  | Held to maturity
($ in thousands) | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 163,297 |  |  | $ | 161,711 |  |  | $ | 785 |  |  | $ | 783 |
Due after one year through five years | 303,371 |  |  | 284,316 |  |  | 103,383 |  |  | 96,428 |
Due after five years through ten years | 160,265 |  |  | 141,132 |  |  | 176,180 |  |  | 169,432 |
Due after ten years | 383,028 |  |  | 320,533 |  |  | 426,743 |  |  | 382,634 |
Agency mortgage-backed securities | 767,508 |  |  | 704,191 |  |  | 51,276 |  |  | 45,497 |
| $ | 1,777,469 |  |  | $ | 1,611,883 |  |  | $ | 758,367 |  |  | $ | 694,774 |
The following tables presents a summary of available-for-sale investment securities in an unrealized loss position:
| March 31, 2024
Less than 12 months |  | 12 months or more |  | Total
($ in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government-sponsored enterprises | $ | 22,611 |  |  | $ | 72 |  |  | $ | 251,397 |  |  | $ | 20,910 |  |  | $ | 274,008 |  |  | $ | 20,982 |
Obligations of states and political subdivisions | 479 |  |  | 2 |  |  | 420,164 |  |  | 77,266 |  |  | 420,643 |  |  | 77,268 |
Agency mortgage-backed securities | 125,634 |  |  | 1,240 |  |  | 531,490 |  |  | 62,470 |  |  | 657,124 |  |  | 63,710 |
U.S. Treasury bills | 59,562 |  |  | 109 |  |  | 109,451 |  |  | 3,166 |  |  | 169,013 |  |  | 3,275 |
Corporate debt securities | — |  |  | — |  |  | 7,811 |  |  | 939 |  |  | 7,811 |  |  | 939 |
| $ | 208,286 |  |  | $ | 1,423 |  |  | $ | 1,320,313 |  |  | $ | 164,751 |  |  | $ | 1,528,599 |  |  | $ | 166,174 |
| December 31, 2023
Less than 12 months |  | 12 months or more |  | Total
($ in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government-sponsored enterprises | $ | 25,886 |  |  | $ | 85 |  |  | $ | 247,027 |  |  | $ | 20,283 |  |  | $ | 272,913 |  |  | $ | 20,368 |
Obligations of states and political subdivisions | 1,168 |  |  | 163 |  |  | 428,171 |  |  | 68,604 |  |  | 429,339 |  |  | 68,767 |
Agency mortgage-backed securities | 58,249 |  |  | 417 |  |  | 540,032 |  |  | 58,666 |  |  | 598,281 |  |  | 59,083 |
U.S. Treasury bills | 41,857 |  |  | 49 |  |  | 103,588 |  |  | 3,021 |  |  | 145,445 |  |  | 3,070 |
Corporate debt securities | — |  |  | — |  |  | 7,574 |  |  | 1,176 |  |  | 7,574 |  |  | 1,176 |
| $ | 127,160 |  |  | $ | 714 |  |  | $ | 1,326,392 |  |  | $ | 151,750 |  |  | $ | 1,453,552 |  |  | $ | 152,464 |
The unrealized losses at both March 31, 2024 and December 31, 2023 were attributable primarily to changes in market interest rates after the securities were purchased. At each of March 31, 2024 and December 31, 2023, the Company did not have an allowance for credit losses on available-for-sale securities. Accrued interest on held-to-maturity debt securities totaled $7.1 million and $6.5 million at March 31, 2024 and December 31, 2023, respectively, and is excluded from the estimate of expected credit losses. The estimate of expected credit losses considers historical credit loss information adjusted for current conditions and reasonable and supportable forecasts. The ACL on held-to-maturity securities was $0.4 million at March 31, 2024 and $0.8 million at December 31, 2023. There were no sales of available-for-sale securities during the three months ended March 31, 2024. The Company sold $28.4 million of available-for-sale securities during the three months ended March 31, 2023 for a gain of $0.4 million. Other Investments At March 31, 2024 and December 31, 2023, other investments totaled $74.1 million and $66.2 million, respectively. As a member of the FHLB system administered by the Federal Housing Finance Agency, the Bank is required to maintain a minimum investment in capital stock with the FHLB consisting of membership stock and activity-based stock. The FHLB capital stock of $14.3 million at March 31, 2024 and $7.8 million at December 31, 2023 is recorded at cost, which represents redemption value, and is included in other investments in the consolidated balance sheets. The remaining amounts in other investments primarily include investments in Small Business Investment Companies, Community Development Financial Institutions, private equity investments, and the Company’s investment in unconsolidated trusts used to issue trust preferred securities to third parties.

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