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Investments (Tables)
 9 Months Ended
Sep. 30, 2024
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, allowance for credit losses and fair value of securities available for sale and held to maturity:
 
 
September 30, 2024
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:
Obligations of U.S. Government-sponsored enterprises$311,531 $639 $(12,496)$299,674 
Obligations of states and political subdivisions493,704 70 (69,597)424,177 
Agency mortgage-backed securities921,704 4,672 (43,707)882,669 
U.S. Treasury bills160,814 70 (1,189)159,695 
Corporate debt securities21,198 — (620)20,578 
          Total securities available for sale$1,908,951 $5,451 $(127,609)$1,786,793 
Held-to-maturity securities:
Obligations of states and political subdivisions$680,211 $7,942 $(44,954)$643,199 
Agency mortgage-backed securities49,168 — (3,868)45,300 
Corporate debt securities122,521 256 (5,727)117,050 
          Total securities held-to-maturity$851,900 $8,198 $(54,549)$805,549 
Allowance for credit losses(253)
          Total securities held-to-maturity, net$851,647 

 December 31, 2023
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$316,511 $303 $(20,368)$296,446 
    Obligations of states and political subdivisions500,881 57 (68,767)432,171 
    Agency mortgage-backed securities758,283 1,181 (59,083)700,381 
U.S. Treasury Bills184,709 62 (3,070)181,701 
Corporate debt securities8,750 — (1,176)7,574 
          Total securities available for sale$1,769,134 $1,603 $(152,464)$1,618,273 
Held-to-maturity securities:
   Obligations of states and political subdivisions$575,699 $7,078 $(47,461)$535,316 
   Agency mortgage-backed securities52,100 — (5,424)46,676 
Corporate debt securities123,420 216 (8,981)114,655 
          Total securities held to maturity$751,219 $7,294 $(61,866)$696,647 
Allowance for credit losses(785)
          Total securities held-to-maturity, net$750,434 
Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation
The following tables present the amortized cost, gross unrealized gains and losses, allowance for credit losses and fair value of securities available for sale and held to maturity:
 
 
September 30, 2024
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:
Obligations of U.S. Government-sponsored enterprises$311,531 $639 $(12,496)$299,674 
Obligations of states and political subdivisions493,704 70 (69,597)424,177 
Agency mortgage-backed securities921,704 4,672 (43,707)882,669 
U.S. Treasury bills160,814 70 (1,189)159,695 
Corporate debt securities21,198 — (620)20,578 
          Total securities available for sale$1,908,951 $5,451 $(127,609)$1,786,793 
Held-to-maturity securities:
Obligations of states and political subdivisions$680,211 $7,942 $(44,954)$643,199 
Agency mortgage-backed securities49,168 — (3,868)45,300 
Corporate debt securities122,521 256 (5,727)117,050 
          Total securities held-to-maturity$851,900 $8,198 $(54,549)$805,549 
Allowance for credit losses(253)
          Total securities held-to-maturity, net$851,647 

 December 31, 2023
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$316,511 $303 $(20,368)$296,446 
    Obligations of states and political subdivisions500,881 57 (68,767)432,171 
    Agency mortgage-backed securities758,283 1,181 (59,083)700,381 
U.S. Treasury Bills184,709 62 (3,070)181,701 
Corporate debt securities8,750 — (1,176)7,574 
          Total securities available for sale$1,769,134 $1,603 $(152,464)$1,618,273 
Held-to-maturity securities:
   Obligations of states and political subdivisions$575,699 $7,078 $(47,461)$535,316 
   Agency mortgage-backed securities52,100 — (5,424)46,676 
Corporate debt securities123,420 216 (8,981)114,655 
          Total securities held to maturity$751,219 $7,294 $(61,866)$696,647 
Allowance for credit losses(785)
          Total securities held-to-maturity, net$750,434 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities at September 30, 2024, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately four years.
Available for saleHeld to maturity
($ in thousands)Amortized CostEstimated Fair ValueAmortized CostEstimated Fair Value
Due in one year or less$152,459 $151,840 $5,307 $5,256 
Due after one year through five years283,921 273,695 124,724 119,447 
Due after five years through ten years200,448 179,565 184,490 182,739 
Due after ten years350,419 299,024 488,211 452,807 
Agency mortgage-backed securities921,704 882,669 49,168 45,300 
 $1,908,951 $1,786,793 $851,900 $805,549 
Schedule of Unrealized Loss on Investments
The following tables presents a summary of available-for-sale investment securities in an unrealized loss position:
 September 30, 2024
Less than 12 months12 months or moreTotal
($ in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of U.S. Government-sponsored enterprises$999 $1 $250,613 $12,495 $251,612 $12,496 
Obligations of states and political subdivisions3,338 100 418,471 69,497 421,809 $69,597 
Agency mortgage-backed securities42,873 180 509,144 43,527 552,017 $43,707 
U.S. Treasury bills— — 83,626 1,189 83,626 $1,189 
Corporate debt securities— — 8,130 620 8,130 $620 
 $47,210 $281 $1,269,984 $127,328 $1,317,194 $127,609 
 December 31, 2023
Less than 12 months12 months or moreTotal
($ in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of U.S. Government-sponsored enterprises$25,886 $85 $247,027 $20,283 $272,913 $20,368 
Obligations of states and political subdivisions1,168 163 428,171 68,604 429,339 68,767 
Agency mortgage-backed securities58,249 417 540,032 58,666 598,281 59,083 
U.S. Treasury bills41,857 49 103,588 3,021 145,445 3,070 
Corporate debt securities— — 7,574 1,176 7,574 1,176 
 $127,160 $714 $1,326,392 $151,750 $1,453,552 $152,464