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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
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, 2024
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Available for Sale(dollars in thousands)
State and municipal securities$965,392 $50 $(145,333)$820,109 
Corporate debt securities368,901 510 (32,013)337,398 
Collateralized mortgage obligations724,602 1,533 (12,366)713,769 
Residential mortgage-backed securities589,267 14 (32,090)557,191 
Commercial mortgage-backed securities610,960 — (99,833)511,127 
   Total $3,259,122 $2,107 $(321,635)$2,939,594 
Held to Maturity
Residential mortgage-backed securities$384,956 $— $(58,593)$326,363 
Commercial mortgage-backed securities859,477 — (152,401)707,076 
Total $1,244,433 $— $(210,994)$1,033,439 

December 31, 2023
Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Available for Sale(dollars in thousands)
U.S. Government securities$42,475 $— $(314)$42,161 
U.S. Government-sponsored agency securities1,038 — (28)1,010 
State and municipal securities1,200,571 1,089 (129,647)1,072,013 
Corporate debt securities480,714 473 (40,636)440,551 
Collateralized mortgage obligations122,824 — (11,390)111,434 
Residential mortgage-backed securities223,273 7 (26,485)196,795 
Commercial mortgage-backed securities627,364 — (92,976)534,388 
   Total $2,698,259 $1,569 $(301,476)$2,398,352 
Held to Maturity
Residential mortgage-backed securities$407,075 $— $(51,805)$355,270 
Commercial mortgage-backed securities860,847 — (143,910)716,937 
Total $1,267,922 $— $(195,715)$1,072,207 
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, 2024, by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay with or without call or prepayment penalties.
June 30, 2024
Available for SaleHeld to Maturity
 Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
 (dollars in thousands)
Due in one year or less$13,762 $13,533 $— $— 
Due from one year to five years110,303 106,430 — — 
Due from five years to ten years362,563 327,817 — — 
Due after ten years847,665 709,727 — — 
1,334,293 1,157,507 — — 
Residential mortgage-backed securities(1)
589,267 557,191 384,956 326,363 
Commercial mortgage-backed securities(1)
610,960 511,127 859,477 707,076 
Collateralized mortgage obligations(1)
724,602 713,769 — — 
  Total$3,259,122 $2,939,594 $1,244,433 $1,033,439 
(1) Maturities for mortgage-backed securities and collateralized mortgage obligations are dependent upon the interest rate environment and prepayments on the
underlying loans.
Summary of Gains and Losses from Equity and Debt Securities, and Losses Recognized from Other-than-Temporary Impairment
The following table presents information related to gross realized gains and losses on the sales of securities:
Gross Realized GainsGross Realized LossesNet Gains (Losses)
Three months ended(dollars in thousands)
June 30, 2024$91 $(20,373)$(20,282)
June 30, 2023— (4)(4)
Six months ended
June 30, 2024$91 $(20,373)$(20,282)
June 30, 2023283 (264)19 
Gross Unrealized Losses and Fair Values of Investments by Category and Length of Time in Continuous Unrealized Loss Position
The following tables present the gross unrealized losses and estimated fair values of investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
June 30, 2024
Less than 12 months12 months or longerTotal
Number of SecuritiesEstimated
Fair Value		Unrealized
Losses		Number of SecuritiesEstimated
Fair Value		Unrealized
Losses		Estimated
Fair Value		Unrealized
Losses
Available for Sale(dollars in thousands)
State and municipal securities19 $48,682 $(1,552)276 $766,484 $(143,781)$815,166 $(145,333)
Corporate debt securities— — — 52 286,277 (32,013)286,277 (32,013)
Collateralized mortgage obligations9 195,411 (601)82 93,219 (11,765)288,630 (12,366)
Residential mortgage-backed securities32 369,024 (1,115)75 183,416 (30,975)552,440 (32,090)
Commercial mortgage-backed securities— — — 135 511,127 (99,833)511,127 (99,833)
Total available for sale60 $613,117 $(3,268)620 $1,840,523 $(318,367)$2,453,640 $(321,635)
Held to Maturity
Residential mortgage-backed securities— $— $— 120 $326,363 $(58,593)$326,363 $(58,593)
Commercial mortgage-backed securities— — — 60 707,076 (152,401)707,076 (152,401)
Total held to maturity— $— $— 180 $1,033,439 $(210,994)$1,033,439 $(210,994)

December 31, 2023
Less than 12 months12 months or longerTotal
Number of SecuritiesEstimated
Fair Value		Unrealized
Losses		Number of SecuritiesEstimated
Fair Value		Unrealized
Losses		Estimated
Fair Value		Unrealized
Losses
Available for Sale(dollars in thousands)
U.S. Government Securities— $— $— 1 $42,161 $(314)$42,161 $(314)
U.S. Government-sponsored agency securities— — — 1 1,010 (28)1,010 (28)
State and municipal securities40 76,155 (858)314 917,274 (128,789)993,429 (129,647)
Corporate debt securities8 42,945 (1,326)60 370,523 (39,310)413,468 (40,636)
Collateralized mortgage obligations— — — 93 111,434 (11,390)111,434 (11,390)
Residential mortgage-backed securities6 409 (3)69 195,453 (26,482)195,862 (26,485)
Commercial mortgage-backed securities2 26,907 (1,053)133 507,481 (91,923)534,388 (92,976)
Total available for sale56 $146,416 $(3,240)671 $2,145,336 $(298,236)$2,291,752 $(301,476)
Held to Maturity
Residential mortgage-backed securities— $— $— 120 $355,270 $(51,805)$355,270 $(51,805)
Commercial mortgage-backed securities— — — 60 716,937 (143,910)716,937 (143,910)
    Total held to maturity— $— $— 180 $1,072,207 $(195,715)$1,072,207 $(195,715)