v3.26.3
Investments (Tables)
 9 Months Ended
Sep. 30, 2026
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:
September 30, 2026
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:
Obligations of U.S. Government-sponsored enterprises$143,433 $— $(8,852)$134,581 
Obligations of states and political subdivisions642,699 — (116,545)526,154 
Agency mortgage-backed securities2,044,967 136 (125,622)1,919,481 
U.S. Treasury bills131,620 — (312)131,308 
Corporate debt securities18,948 175 (51)19,072 
          Total securities available-for-sale$2,981,667 $311 $(251,382)$2,730,596 
Held-to-maturity securities:
Obligations of states and political subdivisions$884,514 $36 $(107,979)$776,571 
Agency mortgage-backed securities35,536 — (4,139)31,397 
Corporate debt securities110,199 366 (4,549)106,016 
          Total securities held-to-maturity$1,030,249 $402 $(116,667)$913,984 
ACL(165)
          Total securities held-to-maturity, net$1,030,084 
December 31, 2025
($ 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$1,074,957 
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation
The following tables present the amortized cost, gross unrealized gains and losses, ACL and fair value of securities available-for-sale and held-to-maturity as of the periods indicated:
September 30, 2026
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:
Obligations of U.S. Government-sponsored enterprises$143,433 $— $(8,852)$134,581 
Obligations of states and political subdivisions642,699 — (116,545)526,154 
Agency mortgage-backed securities2,044,967 136 (125,622)1,919,481 
U.S. Treasury bills131,620 — (312)131,308 
Corporate debt securities18,948 175 (51)19,072 
          Total securities available-for-sale$2,981,667 $311 $(251,382)$2,730,596 
Held-to-maturity securities:
Obligations of states and political subdivisions$884,514 $36 $(107,979)$776,571 
Agency mortgage-backed securities35,536 — (4,139)31,397 
Corporate debt securities110,199 366 (4,549)106,016 
          Total securities held-to-maturity$1,030,249 $402 $(116,667)$913,984 
ACL(165)
          Total securities held-to-maturity, net$1,030,084 
December 31, 2025
($ 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 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities at September 30, 2026, 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 six years.

Available-for-saleHeld-to-maturity
($ in thousands)Amortized CostEstimated Fair ValueAmortized CostEstimated Fair Value
Due in one year or less$171,797 $171,271 $11,428 $11,332 
Due after one year through five years21,763 21,179 136,465 131,596 
Due after five years through ten years462,963 379,500 292,655 268,849 
Due after ten years280,177 239,165 554,166 470,810 
Agency mortgage-backed securities2,044,967 1,919,481 35,535 31,397 
$2,981,667 $2,730,596 $1,030,249 $913,984 
Schedule of Unrealized Loss on Investments
The following tables present a summary of available-for-sale investment securities in an unrealized loss position as of the periods indicated:
September 30, 2026
Less than 12 months12 months or moreTotal
($ in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of U.S. Government-sponsored enterprises$78,193 $4,291 $53,415 $4,561 $131,608 $8,852 
Obligations of states and political subdivisions190,304 19,057 335,850 97,488 526,154 116,545 
Agency mortgage-backed securities1,536,059 79,677 291,653 45,945 1,827,712 125,622 
U.S. Treasury bills131,308 312 — — 131,308 312 
Corporate debt securities987 13 1,962 38 2,949 51 
$1,936,851 $103,350 $682,880 $148,032 $2,619,731 $251,382 
December 31, 2025
Less than 12 months12 months or moreTotal
($ 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