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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2025
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, 2025
(Dollars in thousands)Amortized CostGross
Unrealized
 Gain		Gross
Unrealized
 Loss		Allowance for Credit LossesFair
Value
Available-for-Sale Debt Securities
Collateralized mortgage obligations (CMO)$490,692 $425 $74,326 $— $416,791 
Fannie Mae (FNMA) mortgage-backed securities (MBS)3,154,279 1,892 410,013 — 2,746,158 
Freddie Mac (FHLMC) MBS117,850 54 8,357 — 109,547 
Ginnie Mae (GNMA) MBS45,594 44 2,740 — 42,898 
Government-sponsored enterprises (GSE) agency notes220,940 — 34,175 — 186,765 
$4,029,355 $2,415 $529,611 $— $3,502,159 
Held-to-Maturity Debt Securities(1)
FNMA MBS$799,548 $— $92,293 $— $707,255 
State and political subdivisions180,156 504 1,727 6 178,927 
$979,704 $504 $94,020 $6 $886,182 
(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 $87.6 million at September 30, 2025, 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, 2024
(Dollars in thousands)Amortized CostGross
Unrealized
 Gain		Gross
Unrealized
 Loss		Allowance for Credit LossesFair
Value
Available-for-Sale Debt Securities
CMO$526,796 $113 $95,967 $— $430,942 
FNMA MBS3,305,418 172 550,011 — 2,755,579 
FHLMC MBS118,605 — 13,091 — 105,514 
GNMA MBS44,578 — 3,902 — 40,676 
GSE agency notes222,869 — 44,932 — 177,937 
$4,218,266 $285 $707,903 $— $3,510,648 
Held-to-Maturity Debt Securities(1)
FNMA MBS$831,325 $— $116,600 $— $714,725 
State and political subdivisions183,843 247 3,297 7 180,786 
$1,015,168 $247 $119,897 $7 $895,511 
(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 $100.5 million at December 31, 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.
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, 2025
(Dollars in thousands)Amortized CostGross
Unrealized
 Gain		Gross
Unrealized
 Loss		Allowance for Credit LossesFair
Value
Available-for-Sale Debt Securities
Collateralized mortgage obligations (CMO)$490,692 $425 $74,326 $— $416,791 
Fannie Mae (FNMA) mortgage-backed securities (MBS)3,154,279 1,892 410,013 — 2,746,158 
Freddie Mac (FHLMC) MBS117,850 54 8,357 — 109,547 
Ginnie Mae (GNMA) MBS45,594 44 2,740 — 42,898 
Government-sponsored enterprises (GSE) agency notes220,940 — 34,175 — 186,765 
$4,029,355 $2,415 $529,611 $— $3,502,159 
Held-to-Maturity Debt Securities(1)
FNMA MBS$799,548 $— $92,293 $— $707,255 
State and political subdivisions180,156 504 1,727 6 178,927 
$979,704 $504 $94,020 $6 $886,182 
(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 $87.6 million at September 30, 2025, 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, 2024
(Dollars in thousands)Amortized CostGross
Unrealized
 Gain		Gross
Unrealized
 Loss		Allowance for Credit LossesFair
Value
Available-for-Sale Debt Securities
CMO$526,796 $113 $95,967 $— $430,942 
FNMA MBS3,305,418 172 550,011 — 2,755,579 
FHLMC MBS118,605 — 13,091 — 105,514 
GNMA MBS44,578 — 3,902 — 40,676 
GSE agency notes222,869 — 44,932 — 177,937 
$4,218,266 $285 $707,903 $— $3,510,648 
Held-to-Maturity Debt Securities(1)
FNMA MBS$831,325 $— $116,600 $— $714,725 
State and political subdivisions183,843 247 3,297 7 180,786 
$1,015,168 $247 $119,897 $7 $895,511 
(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 $100.5 million at December 31, 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.
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, 2025 and 2024:
Three months ended September 30,Nine months ended September 30,
(Dollars in thousands)2025202420252024
Allowance for credit losses:
Beginning balance$6 $7 $7 $8 
Release of credit losses— — (1)(1)
Ending balance$6 $7 $6 $7 
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, 2025 and December 31, 2024 are presented in the table below:
 Available-for-Sale
 AmortizedFair
(Dollars in thousands)CostValue
September 30, 2025 (1)
Within one year$46,291 $45,761 
After one year but within five years158,811 150,121 
After five years but within ten years483,677 429,792 
After ten years3,340,576 2,876,485 
$4,029,355 $3,502,159 
December 31, 2024 (1)
Within one year$16,833 $16,698 
After one year but within five years147,157 138,870 
After five years but within ten years487,921 409,908 
After ten years3,566,355 2,945,172 
$4,218,266 $3,510,648 
(1)Actual maturities could differ from contractual maturities.
The scheduled maturities of held-to-maturity debt securities at September 30, 2025 and December 31, 2024 are presented in the table below:
 Held-to-Maturity
 AmortizedFair
(Dollars in thousands)CostValue
September 30, 2025 (1)
Within one year$1,420 $1,420 
After one year but within five years19,175 19,163 
After five years but within ten years68,957 68,957 
After ten years890,152 796,642 
$979,704 $886,182 
December 31, 2024 (1)
Within one year$— $— 
After one year but within five years16,727 16,444 
After five years but within ten years51,671 50,451 
After ten years946,770 828,616 
$1,015,168 $895,511 
(1)Actual maturities could differ from contractual maturities.
Schedule of Investment Securities' Gross Unrealized Losses and Fair Value by Investment Category
For debt securities in an unrealized loss position, the table below shows the gross unrealized losses and fair value by investment category and length of time that individual debt securities were in a continuous unrealized loss position at September 30, 2025.
 Duration of Unrealized Loss Position  
 Less than 12 months12 months or longerTotal
 FairUnrealizedFairUnrealizedFairUnrealized
(Dollars in thousands)ValueLossValueLossValueLoss
Available-for-sale debt securities:
CMO$— $— $406,409 $74,326 $406,409 $74,326 
FNMA MBS36,195 167 2,598,550 409,846 2,634,745 410,013 
FHLMC MBS— — 104,548 8,357 104,548 8,357 
GNMA MBS4,450 116 35,184 2,624 39,634 2,740 
GSE agency notes— — 186,765 34,175 186,765 34,175 
$40,645 $283 $3,331,456 $529,328 $3,372,101 $529,611 
For debt securities in an unrealized loss position, the table below shows the gross unrealized losses and fair value by investment category and length of time that individual debt securities were in a continuous unrealized loss position at December 31, 2024.
 Duration of Unrealized Loss Position  
 Less than 12 months12 months or longerTotal
 FairUnrealizedFairUnrealizedFairUnrealized
(Dollars in thousands)ValueLossValueLossValueLoss
Available-for-sale debt securities:
CMO$— $— $420,663 $95,967 $420,663 $95,967 
FNMA MBS46,971 525 2,691,778 549,486 2,738,749 550,011 
FHLMC MBS6 — 105,508 13,091 105,514 13,091 
GNMA MBS4,404 143 35,054 3,759 39,458 3,902 
GSE agency notes— — 177,937 44,932 177,937 44,932 
$51,381 $668 $3,430,940 $707,235 $3,482,321 $707,903 
Schedule of Held-to-Maturity Credit Quality Indicators The following table summarizes the amortized cost of debt securities held-to-maturity as of September 30, 2025, aggregated by credit quality indicator:
(Dollars in thousands)FNMA MBSState and political subdivisions
A+ rated or higher$— $180,156 
Not rated799,548 — 
Ending balance$799,548 $180,156 
The following table summarizes the amortized cost of debt securities held-to-maturity as of December 31, 2024, aggregated by credit quality indicator:
(Dollars in thousands)FNMA MBSState and political subdivisions
A+ rated or higher$— $183,843 
Not rated831,325 — 
Ending balance$831,325 $183,843