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Investments (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 tables present the amortized cost, gross unrealized gains and losses, ACL and fair value of securities available-for-sale and held-to-maturity as of the periods indicated: 
 December 31, 2025
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$187,587 $76 $(5,091)$182,572 
    Obligations of states and political subdivisions626,900 3,914 (58,109)572,705 
    Agency mortgage-backed securities1,733,003 12,638 (36,330)1,709,311 
    U.S. Treasury Bills171,355 128 (499)170,984 
    Corporate debt securities19,448 109 (94)19,463 
          Total securities available-for-sale$2,738,293 $16,865 $(100,123)$2,655,035 
Held-to-maturity securities:
    Obligations of states and political subdivisions$920,199 $10,861 $(39,849)$891,211 
    Agency mortgage-backed securities43,839 — (3,199)40,640 
    Corporate debt securities111,064 325 (3,426)107,963 
          Total securities held-to-maturity$1,075,102 $11,186 $(46,474)$1,039,814 
ACL(145)
Total securities held-to-maturity, net$1,074,957 
 December 31, 2024
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$290,329 $69 $(14,358)$276,040 
    Obligations of states and political subdivisions492,896 12 (83,711)409,197 
    Agency mortgage-backed securities1,090,495 1,072 (64,173)1,027,394 
    U.S. Treasury Bills130,565 34 (1,706)128,893 
    Corporate debt securities21,198 — (452)20,746 
Total securities available-for-sale$2,025,483 $1,187 $(164,400)$1,862,270 
Held-to-maturity securities:
    Obligations of states and political subdivisions$759,059 $2,366 $(60,351)$701,074 
    Agency mortgage-backed securities47,912 — (5,004)42,908 
    Corporate debt securities122,221 269 (7,601)114,889 
Total securities held-to-maturity$929,192 $2,635 $(72,956)$858,871 
ACL(257)
Total securities held-to-maturity, net$928,935 
Debt Securities, Available-for-sale
The following tables present the amortized cost, gross unrealized gains and losses, ACL and fair value of securities available-for-sale and held-to-maturity as of the periods indicated: 
 December 31, 2025
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$187,587 $76 $(5,091)$182,572 
    Obligations of states and political subdivisions626,900 3,914 (58,109)572,705 
    Agency mortgage-backed securities1,733,003 12,638 (36,330)1,709,311 
    U.S. Treasury Bills171,355 128 (499)170,984 
    Corporate debt securities19,448 109 (94)19,463 
          Total securities available-for-sale$2,738,293 $16,865 $(100,123)$2,655,035 
Held-to-maturity securities:
    Obligations of states and political subdivisions$920,199 $10,861 $(39,849)$891,211 
    Agency mortgage-backed securities43,839 — (3,199)40,640 
    Corporate debt securities111,064 325 (3,426)107,963 
          Total securities held-to-maturity$1,075,102 $11,186 $(46,474)$1,039,814 
ACL(145)
Total securities held-to-maturity, net$1,074,957 
 December 31, 2024
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$290,329 $69 $(14,358)$276,040 
    Obligations of states and political subdivisions492,896 12 (83,711)409,197 
    Agency mortgage-backed securities1,090,495 1,072 (64,173)1,027,394 
    U.S. Treasury Bills130,565 34 (1,706)128,893 
    Corporate debt securities21,198 — (452)20,746 
Total securities available-for-sale$2,025,483 $1,187 $(164,400)$1,862,270 
Held-to-maturity securities:
    Obligations of states and political subdivisions$759,059 $2,366 $(60,351)$701,074 
    Agency mortgage-backed securities47,912 — (5,004)42,908 
    Corporate debt securities122,221 269 (7,601)114,889 
Total securities held-to-maturity$929,192 $2,635 $(72,956)$858,871 
ACL(257)
Total securities held-to-maturity, net$928,935 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities at December 31, 2025, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately five years.
Available-for-saleHeld-to-maturity
($ in thousands)Amortized CostEstimated
Fair Value		Amortized CostEstimated
Fair Value
Due in one year or less$250,905 $249,646 $4,616 $4,616 
Due after one year through five years76,242 74,783 129,862 127,143 
Due after five years through ten years353,222 320,753 239,892 239,658 
Due after ten years324,921 300,542 656,893 627,757 
Agency mortgage-backed securities1,733,003 1,709,311 43,839 40,640 
 $2,738,293 $2,655,035 $1,075,102 $1,039,814 
There were 681 and 830 available-for-sale securities in an unrealized loss position as of December 31, 2025 and 2024, respectively, included in the following tables:
 
 December 31, 2025
Less than 12 months12 months or moreTotal
($ in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of U.S. Government-sponsored enterprises$13,971 $22 $149,230 $5,069 $163,201 $5,091 
Obligations of states and political subdivisions32,658 245 425,879 57,864 458,537 58,109 
Agency mortgage-backed securities266,639 1,215 377,787 35,115 644,426 36,330 
U.S. Treasury Bills4,996 — 40,418 499 45,414 499 
Corporate debt securities— — 3,406 94 3,406 94 
 $318,264 $1,482 $996,720 $98,641 $1,314,984 $100,123 
 December 31, 2024
Less than 12 months12 months or moreTotal
($ in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of U.S. Government-sponsored enterprises$21,044 $132 $234,191 $14,226 $255,235 $14,358 
Obligations of states and political subdivisions3,117 143 403,767 83,568 406,884 83,711 
Agency mortgage-backed securities423,600 6,763 478,790 57,410 902,390 64,173 
U.S. Treasury Bills11,708 23 54,177 1,683 65,885 1,706 
Corporate debt securities1,956 44 8,342 408 10,298 452 
 $461,425 $7,105 $1,179,267 $157,295 $1,640,692 $164,400 
Schedule of Realized Gain (Loss)
The following table presents a summary of proceeds, gross gains and losses realized from sales of available-for-sale investment securities for the periods indicated:
 
 Twelve months ended
($ in thousands)December 31, 2025December 31, 2024December 31, 2023
Gross gains realized$1,631 $— $601 
Gross losses realized(1,582)— — 
Proceeds from sales139,051 — 40,393