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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale and Held-to-maturity Securities Reconciliation
The following is a summary of investment securities as of the dates indicated:

 December 31, 2024December 31, 2023
 Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses
Fair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
 (Dollars in thousands)
Debt securities AFS:
U.S. Treasury securities$— $— $— $— $103,691 $21 $(35)$103,677 
U.S. Government agency and U.S. Government sponsored enterprises:
Agency securities4,000 — (43)3,957 4,000 — (100)3,900 
CMOs861,179 152 (139,425)721,906 888,631 367 (141,279)747,719 
MBS:
Residential473,099 — (86,039)387,060 499,431 — (79,133)420,298 
Commercial466,929 — (56,078)410,851 445,207 113 (53,432)391,888 
Asset-backed securities103,081 157 (14)103,224 150,992 — (1,322)149,670 
Corporate securities23,254 — (2,560)20,694 23,302 — (3,868)19,434 
Municipal securities191,138 28 (15,615)175,551 314,554 5,698 (11,779)308,473 
Total investment securities AFS$2,122,680 $337 $(299,774)$1,823,243 $2,429,808 $6,199 $(290,948)$2,145,059 
Debt securities HTM:
U.S. Government agency and U.S. Government sponsored enterprises:
MBS:
Residential$142,059 $— $(12,629)$129,430 $150,369 $— $(6,663)$143,706 
Commercial110,326 — (8,632)101,694 113,543 — (6,731)106,812 
Total investment securities HTM$252,385 $— $(21,261)$231,124 $263,912 $— $(13,394)$250,518 
Schedule of Realized Gain (Loss)
The table below summarizes the proceeds from and gains and losses on the sales and calls of investment securities AFS, for the periods presented below.
Twelve Months Ended December 31,
202420232022
(Dollars in thousands)
Proceeds from sales and calls of investment securities AFS$276,252 $— $— 
Gains from sales of investment securities AFS$2,908 $— $— 
Losses from sales of investment securities AFS(1,972)— — 
Net gain on sales and calls of investment securities AFS$936 $— $— 
Interest Income
The following table presents a breakdown of interest income recorded for investment securities that are taxable and nontaxable.
 Year Ended December 31,
 202420232022
 (Dollars in thousands)
Interest income on investment securities
Taxable$65,285 $61,696 $50,043 
Nontaxable3,264 4,367 2,177 
Total$68,549 $66,063 $52,220 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of investment securities at December 31, 2024, by contractual maturity, are presented in the table below. Collateralized mortgage obligations, mortgage-backed securities, and asset-backed securities are presented by final maturity. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties.
Available for SaleHeld to Maturity
Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
 (Dollars in thousands)
Debt securities:
Due within one year$— $— $— $— 
Due after one year through five years141,306 134,899 23,785 23,288 
Due after five years through ten years130,997 123,088 8,815 8,348 
Due after ten years1,850,377 1,565,256 219,785 199,488 
Total$2,122,680 $1,823,243 $252,385 $231,124 
Schedule of Gross Unrealized Losses and Estimated Fair Values of Investments
The following tables show the Company’s investments’ gross unrealized losses and estimated fair values, aggregated by investment category and the length of time that the individual securities have been in a continuous unrealized loss position as of the dates indicated. The length of time that the individual securities have been in a continuous unrealized loss position is not a factor in determining credit impairment.    
December 31, 2024
Less than 12 months12 months or longerTotal
Description of
Securities AFS		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses
  (Dollars in thousands)
U.S. Government agency and U.S. Government sponsored enterprises:
Agency securities— $— $— 1 $3,957 $(43)1 $3,957 $(43)
CMOs7 59,661 (527)95 636,472 (138,898)102 696,133 (139,425)
MBS:
Residential2 19,183 (1,029)63 367,877 (85,010)65 387,060 (86,039)
Commercial10 70,728 (2,406)57 340,123 (53,672)67 410,851 (56,078)
Asset-backed securities1 5,007 (14)— — — 1 5,007 (14)
Corporate securities— — — 6 20,694 (2,560)6 20,694 (2,560)
Municipal securities18 77,119 (3,348)39 83,515 (12,267)57 160,634 (15,615)
Total38 $231,698 $(7,324)261 $1,452,638 $(292,450)299 $1,684,336 $(299,774)


December 31, 2023
Less than 12 months12 months or longerTotal
Description of
Securities AFS		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses		Number 
of
Securities		Fair 
Value		Gross
Unrealized
Losses
  (Dollars in thousands)
U.S. Treasury securities— $— $— 1 $3,963 $(35)1 $3,963 $(35)
U.S. Government agency and U.S. Government sponsored enterprises:
Agency securities— — — 1 3,900 (100)1 3,900 (100)
CMOs3 19,800 (378)115 717,662 (140,901)118 737,462 (141,279)
MBS:
Residential— — — 65 420,298 (79,133)65 420,298 (79,133)
Commercial6 53,255 (2,129)53 331,450 (51,303)59 384,705 (53,432)
Asset-backed securities— — — 18 149,670 (1,322)18 149,670 (1,322)
Corporate securities— — — 6 19,434 (3,868)6 19,434 (3,868)
Municipal securities11 42,760 (263)42 91,707 (11,516)53 134,467 (11,779)
Total20 $115,815 $(2,770)301 $1,738,084 $(288,178)321 $1,853,899 $(290,948)