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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2025
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, 2025December 31, 2024
 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. Government agency and U.S. Government sponsored enterprises:
Agency securities$— $— $— $— $4,000 $— $(43)$3,957 
CMOs706,528 1,116 (91,137)616,507 861,179 152 (139,425)721,906 
MBS:
Residential521,939 3,549 (48,105)477,383 473,099 — (86,039)387,060 
Commercial502,092 1,807 (43,157)460,742 466,929 — (56,078)410,851 
Asset-backed securities129,854 150 (4)130,000 103,081 157 (14)103,224 
Corporate securities23,009 — (1,873)21,136 23,254 — (2,560)20,694 
Municipal securities134,969 645 (8,300)127,314 191,138 28 (15,615)175,551 
Total investment securities AFS$2,018,391 $7,267 $(192,576)$1,833,082 $2,122,680 $337 $(299,774)$1,823,243 
Debt securities HTM:
U.S. Government agency and U.S. Government sponsored enterprises:
MBS:
Residential$133,121 $— $(7,358)$125,763 $142,059 $— $(12,629)$129,430 
Commercial106,661 18 (5,418)101,261 110,326 — (8,632)101,694 
Total investment securities HTM$239,782 $18 $(12,776)$227,024 $252,385 $— $(21,261)$231,124 
Schedule of Realized Gain (Loss)
The table below summarizes the proceeds from and gains and losses on the sales of investment securities AFS, for the periods presented below.
Year Ended December 31,
202520242023
(Dollars in thousands)
Proceeds from sales of investment securities AFS$1,133,470 $276,252 $— 
Gains from sales of investment securities AFS$1,574 $2,908 $— 
Losses from sales of investment securities AFS(39,262)(1,972)— 
Net (losses) gains on sales of investment securities AFS$(37,688)$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,
 202520242023
 (Dollars in thousands)
Interest income on investment securities
Taxable$74,543 $65,285 $61,696 
Nontaxable1,692 3,264 4,367 
Total$76,235 $68,549 $66,063 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of investment securities at December 31, 2025, by contractual maturity, are presented in the table below. Collateralized mortgage obligations, mortgage-backed securities, and asset-backed securities are presented by final maturity. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations, with or without call or prepayment penalties.
Available for SaleHeld to Maturity
Amortized
Cost		Estimated
Fair Value		Amortized
Cost		Estimated
Fair Value
 (Dollars in thousands)
Debt securities:
Due within one year$— $— $— $— 
Due after one year through five years— — 30,946 30,845 
Due after five years through ten years108,251 104,556 — — 
Due after ten years1,910,140 1,728,526 208,836 196,179 
Total$2,018,391 $1,833,082 $239,782 $227,024 
Schedule of Gross Unrealized Losses and Fair Value
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, 2025
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:
CMOs— $— $— 40 $463,133 $(91,137)40 $463,133 $(91,137)
MBS:
Residential2 9,718 (19)43 272,276 (48,086)45 281,994 (48,105)
Commercial7 64,572 (320)41 272,407 (42,837)48 336,979 (43,157)
Asset-backed securities1 5,003 (4)— — — 1 5,003 (4)
Corporate securities1 3,946 (54)4 17,190 (1,819)5 21,136 (1,873)
Municipal securities1 2,619 (12)27 87,292 (8,288)28 89,911 (8,300)
Total12 $85,858 $(409)155 $1,112,298 $(192,167)167 $1,198,156 $(192,576)


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)