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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Allowance for Credit Losses and Fair Value
The following tables summarize the amortized cost, allowance for credit losses and fair value of the AFS debt securities and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive loss, net at September 30, 2025 and December 31, 2024:  
September 30, 2025
 Amortized cost Gross unrealized gains Gross unrealized losses Allowance for credit losses on investments Fair Value
Investment Securities    
AFS debt securities  
U.S. government agency securities$656,685 $31 $(3,519)$— $653,197 
Mortgage-backed securities - residential619,439 511 (32,363)— 587,587 
Mortgage-backed securities - commercial 11,201 8 (528)— 10,681 
Municipal securities185,472 480 (20,541)— 165,411 
U.S. Treasury securities7,061 19 — — 7,080 
Corporate securities2,983 17 (5)— 2,995 
Total$1,482,841 $1,066 $(56,956)$— $1,426,951 
December 31, 2024
 Amortized costGross unrealized gains Gross unrealized losses Allowance for credit losses on investmentsFair Value
Investment Securities    
AFS debt securities    
U.S. government agency securities$564,752 $172 $(1,917)$— $563,007 
Mortgage-backed securities - residential927,883 393 (117,277)— 810,999 
Mortgage-backed securities - commercial15,965 — (1,108)— 14,857 
Municipal securities169,498 20 (21,661)— 147,857 
U.S. Treasury securities299 — — — 299 
Corporate securities1,000 — (11)— 989 
Total$1,679,397 $585 $(141,974)$— $1,538,008 
Schedule of Gross Unrealized Losses
The following tables show gross unrealized losses on AFS debt securities for which an allowance for credit losses has not been recorded at September 30, 2025 and December 31, 2024, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
September 30, 2025
 Less than 12 months12 months or moreTotal
 Fair ValueGross Unrealized Loss Fair ValueGross Unrealized LossFair ValueGross Unrealized Loss
U.S. government agency securities$547,360 $(2,712)$71,347 $(807)$618,707 $(3,519)
Mortgage-backed securities - residential191,440 (1,976)165,468 (30,387)356,908 (32,363)
Mortgage-backed securities - commercial— — 8,795 (528)8,795 (528)
Municipal securities5,050 (25)135,571 (20,516)140,621 (20,541)
Corporate securities— — 995 (5)995 (5)
Total$743,850 $(4,713)$382,176 $(52,243)$1,126,026 $(56,956)
 December 31, 2024
 Less than 12 months12 months or moreTotal
 Fair ValueGross Unrealized LossFair ValueGross Unrealized LossFair ValueGross Unrealized Loss
U.S. government agency securities$494,885 $(1,908)$714 $(9)$495,599 $(1,917)
Mortgage-backed securities - residential209,078 (8,956)441,502 (108,321)650,580 (117,277)
Mortgage-backed securities - commercial2,222 (19)12,635 (1,089)14,857 (1,108)
Municipal securities34,059 (2,376)110,173 (19,285)144,232 (21,661)
Corporate securities— — 989 (11)989 (11)
Total$740,244 $(13,259)$566,013 $(128,715)$1,306,257 $(141,974)
Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity
The amortized cost and fair value of AFS debt securities by contractual maturity as of September 30, 2025 and December 31, 2024 are shown below. 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.
September 30,December 31,
 2025 2024 
 Available-for-saleAvailable-for-sale
 Amortized costFair ValueAmortized costFair Value
Due in one year or less$205 $203 $849 $847 
Due in one to five years14,433 14,445 4,186 4,600 
Due in five to ten years346,312 342,997 225,954 222,943 
Due in over ten years491,251 471,038 504,560 483,762 
852,201 828,683 735,549 712,152 
Mortgage-backed securities - residential619,439 587,587 927,883 810,999 
Mortgage-backed securities - commercial11,201 10,681 15,965 14,857 
Total AFS debt securities$1,482,841 $1,426,951 $1,679,397 $1,538,008 
Schedule of Sales and Other Dispositions of Available-for-Sale Securities
Sales and other dispositions of AFS debt securities were as follows:
 Three Months Ended September 30,Nine Months Ended September 30,
 2025 2024 2025 2024 
Proceeds from sales$440 $318,194 $266,894 $526,076 
Proceeds from maturities, prepayments and calls83,204 89,834 217,865 224,070 
Gross realized gains— — 104 90 
Gross realized losses— 40,165 60,637 56,468 
Schedule of Restricted Equity Securities, At Cost
The table below represents the Company’s restricted equity securities held at cost as of September 30, 2025 and December 31, 2024.
 September 30,December 31,
 20252024
FHLB stock$34,813 $32,749 
First National Banker's Bankshares, Inc. stock1,168 — 
Pacific Coast Banker's Bank stock250 — 
Total restricted equity securities, at cost$36,231 $32,749