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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Debt Securities, Available-for-sale | The following tables detail the amortized cost, allowance for credit losses and the estimated fair value of the Company's investments in available-for-sale and held-to-maturity debt securities. None of the Company's investments in debt securities are classified as trading.
|  | September 30, 2024
(Dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Allowance for Credit Losses |  | Fair Value
Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |
Collateralized mortgage obligation (CMO) |  | $ | 537,666 |  |  | $ | 566 |  |  | $ | 82,749 |  |  | $ | — |  |  | $ | 455,483 |
Fannie Mae (FNMA) mortgage-backed securities (MBS) |  | 3,362,926 |  |  | 793 |  |  | 423,832 |  |  | — |  |  | 2,939,887 |
Freddie Mac (FHLMC) MBS |  | 120,570 |  |  | — |  |  | 8,763 |  |  | — |  |  | 111,807 |
Ginnie Mae (GNMA) MBS |  | 46,150 |  |  | 41 |  |  | 2,368 |  |  | — |  |  | 43,823 |
Government-sponsored enterprises (GSE) agency notes |  | 223,511 |  |  | — |  |  | 37,392 |  |  | — |  |  | 186,119 |
|  | $ | 4,290,823 |  |  | $ | 1,400 |  |  | $ | 555,104 |  |  | $ | — |  |  | $ | 3,737,119 |
Held-to-Maturity Debt Securities(1) |  |  |  |  |  |  |  |  |  |
FNMA MBS |  | $ | 841,697 |  |  | $ | — |  |  | $ | 68,348 |  |  | $ | — |  |  | $ | 773,349 |
State and political subdivisions |  | 184,615 |  |  | 1,795 |  |  | 783 |  |  | 7 |  |  | 185,620 |
|  | $ | 1,026,312 |  |  | $ | 1,795 |  |  | $ | 69,131 |  |  | $ | 7 |  |  | $ | 958,969 |
(1)Held-to-maturity securities transferred from available-for-sale are included in held-to-maturity at fair value basis at the time of transfer. The amortized cost of transferred held-to-maturity securities included net unrealized losses of $105.4 million at September 30, 2024, which are offset in Accumulated other comprehensive loss. At the time of transfer, there was no allowance for credit loss on the available-for-sale securities. Subsequent to transfer, the securities were evaluated for credit loss.
|  | December 31, 2023
(Dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Allowance for Credit Losses |  | Fair Value
Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |
CMO |  | $ | 560,952 |  |  | $ | — |  |  | $ | 96,333 |  |  | $ | — |  |  | $ | 464,619 |
FNMA MBS |  | 3,544,762 |  |  | 162 |  |  | 502,574 |  |  | — |  |  | 3,042,350 |
FHLMC MBS |  | 126,856 |  |  | — |  |  | 11,324 |  |  | — |  |  | 115,532 |
GNMA MBS |  | 46,333 |  |  | 6 |  |  | 2,999 |  |  | — |  |  | 43,340 |
GSE agency notes |  | 225,439 |  |  | — |  |  | 44,743 |  |  | — |  |  | 180,696 |
|  | $ | 4,504,342 |  |  | $ | 168 |  |  | $ | 657,973 |  |  | $ | — |  |  | $ | 3,846,537 |
Held-to-Maturity Debt Securities(1) |  |  |  |  |  |  |  |  |  |
FNMA MBS |  | $ | 872,653 |  |  | $ | — |  |  | $ | 74,332 |  |  | $ | — |  |  | $ | 798,321 |
State and political subdivisions |  | 185,912 |  |  | 2,665 |  |  | 959 |  |  | 8 |  |  | 187,610 |
|  | $ | 1,058,565 |  |  | $ | 2,665 |  |  | $ | 75,291 |  |  | $ | 8 |  |  | $ | 985,931 |
(1)Held-to-maturity securities transferred from available-for-sale are included in held-to-maturity at fair value at the time of transfer. The amortized cost of transferred held-to-maturity securities included net unrealized losses of $120.4 million at December 31, 2023, which are offset in Accumulated other comprehensive loss. At the time of transfer, there was no allowance for credit loss on the available-for-sale securities. Subsequent to transfer, the securities were evaluated for credit loss.
Schedule of Debt Securities, Held-to-maturity | The following tables detail the amortized cost, allowance for credit losses and the estimated fair value of the Company's investments in available-for-sale and held-to-maturity debt securities. None of the Company's investments in debt securities are classified as trading.
|  | September 30, 2024
(Dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Allowance for Credit Losses |  | Fair Value
Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |
Collateralized mortgage obligation (CMO) |  | $ | 537,666 |  |  | $ | 566 |  |  | $ | 82,749 |  |  | $ | — |  |  | $ | 455,483 |
Fannie Mae (FNMA) mortgage-backed securities (MBS) |  | 3,362,926 |  |  | 793 |  |  | 423,832 |  |  | — |  |  | 2,939,887 |
Freddie Mac (FHLMC) MBS |  | 120,570 |  |  | — |  |  | 8,763 |  |  | — |  |  | 111,807 |
Ginnie Mae (GNMA) MBS |  | 46,150 |  |  | 41 |  |  | 2,368 |  |  | — |  |  | 43,823 |
Government-sponsored enterprises (GSE) agency notes |  | 223,511 |  |  | — |  |  | 37,392 |  |  | — |  |  | 186,119 |
|  | $ | 4,290,823 |  |  | $ | 1,400 |  |  | $ | 555,104 |  |  | $ | — |  |  | $ | 3,737,119 |
Held-to-Maturity Debt Securities(1) |  |  |  |  |  |  |  |  |  |
FNMA MBS |  | $ | 841,697 |  |  | $ | — |  |  | $ | 68,348 |  |  | $ | — |  |  | $ | 773,349 |
State and political subdivisions |  | 184,615 |  |  | 1,795 |  |  | 783 |  |  | 7 |  |  | 185,620 |
|  | $ | 1,026,312 |  |  | $ | 1,795 |  |  | $ | 69,131 |  |  | $ | 7 |  |  | $ | 958,969 |
(1)Held-to-maturity securities transferred from available-for-sale are included in held-to-maturity at fair value basis at the time of transfer. The amortized cost of transferred held-to-maturity securities included net unrealized losses of $105.4 million at September 30, 2024, which are offset in Accumulated other comprehensive loss. At the time of transfer, there was no allowance for credit loss on the available-for-sale securities. Subsequent to transfer, the securities were evaluated for credit loss.
|  | December 31, 2023
(Dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Allowance for Credit Losses |  | Fair Value
Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |
CMO |  | $ | 560,952 |  |  | $ | — |  |  | $ | 96,333 |  |  | $ | — |  |  | $ | 464,619 |
FNMA MBS |  | 3,544,762 |  |  | 162 |  |  | 502,574 |  |  | — |  |  | 3,042,350 |
FHLMC MBS |  | 126,856 |  |  | — |  |  | 11,324 |  |  | — |  |  | 115,532 |
GNMA MBS |  | 46,333 |  |  | 6 |  |  | 2,999 |  |  | — |  |  | 43,340 |
GSE agency notes |  | 225,439 |  |  | — |  |  | 44,743 |  |  | — |  |  | 180,696 |
|  | $ | 4,504,342 |  |  | $ | 168 |  |  | $ | 657,973 |  |  | $ | — |  |  | $ | 3,846,537 |
Held-to-Maturity Debt Securities(1) |  |  |  |  |  |  |  |  |  |
FNMA MBS |  | $ | 872,653 |  |  | $ | — |  |  | $ | 74,332 |  |  | $ | — |  |  | $ | 798,321 |
State and political subdivisions |  | 185,912 |  |  | 2,665 |  |  | 959 |  |  | 8 |  |  | 187,610 |
|  | $ | 1,058,565 |  |  | $ | 2,665 |  |  | $ | 75,291 |  |  | $ | 8 |  |  | $ | 985,931 |
(1)Held-to-maturity securities transferred from available-for-sale are included in held-to-maturity at fair value at the time of transfer. The amortized cost of transferred held-to-maturity securities included net unrealized losses of $120.4 million at December 31, 2023, which are offset in Accumulated other comprehensive loss. At the time of transfer, there was no allowance for credit loss on the available-for-sale securities. Subsequent to transfer, the securities were evaluated for credit loss. The following table presents the activity in the allowance for credit losses for state and political subdivisions debt securities for the three and nine months ended September 30, 2024 and 2023:
|  | Three months ended September 30, |  | Nine months ended September 30,
(Dollars in thousands) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Allowance for credit losses: |  |  |  |  |  |  |  |
Beginning balance |  | $ | 7 |  |  | $ | 8 |  |  | $ | 8 |  |  | $ | 10 |
Release of credit losses |  | — |  |  | — |  |  | (1) |  |  | (2) |
Ending balance |  | $ | 7 |  |  | $ | 8 |  |  | $ | 7 |  |  | $ | 8 |
Schedule of Maturities of Investment Securities Available-for-Sale and Held-to-Maturity | The scheduled maturities of available-for-sale debt securities at September 30, 2024 and December 31, 2023 are presented in the table below:
|  | Available-for-Sale
|  | Amortized |  | Fair
(Dollars in thousands) |  | Cost |  | Value
September 30, 2024 (1) |  |  |  |
Within one year |  | $ | 16,929 |  |  | $ | 16,709 |
After one year but within five years |  | 128,143 |  |  | 123,447 |
After five years but within ten years |  | 503,009 |  |  | 438,564 |
After ten years |  | 3,642,742 |  |  | 3,158,399 |
|  | $ | 4,290,823 |  |  | $ | 3,737,119 |
December 31, 2023 (1) |  |  |  |
Within one year |  | $ | — |  |  | $ | — |
After one year but within five years |  | 86,224 |  |  | 82,387 |
After five years but within ten years |  | 569,956 |  |  | 485,593 |
After ten years |  | 3,848,162 |  |  | 3,278,557 |
|  | $ | 4,504,342 |  |  | $ | 3,846,537 |
(1)Actual maturities could differ from contractual maturities. The scheduled maturities of held-to-maturity debt securities at September 30, 2024 and December 31, 2023 are presented in the table below:
|  | Held-to-Maturity
|  | Amortized |  | Fair
(Dollars in thousands) |  | Cost |  | Value
September 30, 2024 (1) |  |  |  |
Within one year |  | $ | — |  |  | $ | — |
After one year but within five years |  | 14,343 |  |  | 14,317 |
After five years but within ten years |  | 53,396 |  |  | 53,382 |
After ten years |  | 958,573 |  |  | 891,270 |
|  | $ | 1,026,312 |  |  | $ | 958,969 |
December 31, 2023 (1) |  |  |  |
Within one year |  | $ | — |  |  | $ | — |
After one year but within five years |  | 10,932 |  |  | 10,856 |
After five years but within ten years |  | 46,489 |  |  | 46,246 |
After ten years |  | 1,001,144 |  |  | 928,829 |
|  | $ | 1,058,565 |  |  | $ | 985,931 |
(1)Actual maturities could differ from contractual maturities.
Schedule of Investment Securities' Gross Unrealized Losses and Fair Value by Investment Category | For debt securities in an unrealized loss position, the table below shows the gross unrealized losses and fair value by investment category and length of time that individual debt securities were in a continuous unrealized loss position at September 30, 2024.
|  | Duration of Unrealized Loss Position |  |  |  |
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(Dollars in thousands) |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
CMO |  | $ | — |  |  | $ | — |  |  | $ | 444,751 |  |  | $ | 82,749 |  |  | $ | 444,751 |  |  | $ | 82,749 |
FNMA MBS |  | 3,126 |  |  | 7 |  |  | 2,889,219 |  |  | 423,825 |  |  | 2,892,345 |  |  | 423,832 |
FHLMC MBS |  | — |  |  | — |  |  | 111,801 |  |  | 8,763 |  |  | 111,801 |  |  | 8,763 |
GNMA MBS |  | 1,896 |  |  | 3 |  |  | 37,791 |  |  | 2,365 |  |  | 39,687 |  |  | 2,368 |
GSE agency notes |  | — |  |  | — |  |  | 186,119 |  |  | 37,392 |  |  | 186,119 |  |  | 37,392 |
|  | $ | 5,022 |  |  | $ | 10 |  |  | $ | 3,669,681 |  |  | $ | 555,094 |  |  | $ | 3,674,703 |  |  | $ | 555,104 |
For debt securities in an unrealized loss position, the table below shows the gross unrealized losses and fair value by investment category and length of time that individual debt securities were in a continuous unrealized loss position at December 31, 2023.
|  | Duration of Unrealized Loss Position |  |  |  |
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(Dollars in thousands) |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
CMO |  | $ | — |  |  | $ | — |  |  | $ | 464,619 |  |  | $ | 96,333 |  |  | $ | 464,619 |  |  | $ | 96,333 |
FNMA MBS |  | 9,068 |  |  | 125 |  |  | 3,026,520 |  |  | 502,449 |  |  | 3,035,588 |  |  | 502,574 |
FHLMC MBS |  | — |  |  | — |  |  | 115,525 |  |  | 11,324 |  |  | 115,525 |  |  | 11,324 |
GNMA MBS |  | 10,543 |  |  | 217 |  |  | 31,681 |  |  | 2,782 |  |  | 42,224 |  |  | 2,999 |
GSE agency notes |  | — |  |  | — |  |  | 180,696 |  |  | 44,743 |  |  | 180,696 |  |  | 44,743 |
|  | $ | 19,611 |  |  | $ | 342 |  |  | $ | 3,819,041 |  |  | $ | 657,631 |  |  | $ | 3,838,652 |  |  | $ | 657,973 |
Schedule of Held-to-Maturity Credit Quality Indicators | The following table summarizes the amortized cost of debt securities held-to-maturity as of September 30, 2024, aggregated by credit quality indicator:
(Dollars in thousands) |  | FNMA MBS |  | State and political subdivisions |  |
A+ rated or higher |  | $ | — |  |  | $ | 184,615 |  |  |
Not rated |  | 841,697 |  |  | — |  |  |
Ending balance |  | $ | 841,697 |  |  | $ | 184,615 |  |  |
The following table summarizes the amortized cost of debt securities held-to-maturity as of December 31, 2023, aggregated by credit quality indicator:
(Dollars in thousands) |  | FNMA MBS |  | State and political subdivisions |  |
A+ rated or higher |  | $ | — |  |  | $ | 185,912 |  |  |
Not rated |  | 872,653 |  |  | — |  |  |
Ending balance |  | $ | 872,653 |  |  | $ | 185,912 |  |  |

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