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Investments (Tables)
 6 Months Ended
Jun. 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:
 
 
June 30, 2024
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:
Obligations of U.S. Government-sponsored enterprises$322,502 $129 $(19,675)$302,956 
Obligations of states and political subdivisions494,340 3 (86,102)408,241 
Agency mortgage-backed securities782,236 385 (63,613)719,008 
U.S. Treasury bills180,836 2 (2,943)177,895 
Corporate debt securities8,750 — (920)7,830 
          Total securities available for sale$1,788,664 $519 $(173,253)$1,615,930 
Held-to-maturity securities:
Obligations of states and political subdivisions$599,916 $3,250 $(57,686)$545,480 
Agency mortgage-backed securities50,226 — (5,630)44,596 
Corporate debt securities122,820 243 (9,619)113,444 
          Total securities held-to-maturity$772,962 $3,493 $(72,935)$703,520 
Allowance for credit losses(314)
          Total securities held-to-maturity, net$772,648 

 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:
 
 
June 30, 2024
($ in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:
Obligations of U.S. Government-sponsored enterprises$322,502 $129 $(19,675)$302,956 
Obligations of states and political subdivisions494,340 3 (86,102)408,241 
Agency mortgage-backed securities782,236 385 (63,613)719,008 
U.S. Treasury bills180,836 2 (2,943)177,895 
Corporate debt securities8,750 — (920)7,830 
          Total securities available for sale$1,788,664 $519 $(173,253)$1,615,930 
Held-to-maturity securities:
Obligations of states and political subdivisions$599,916 $3,250 $(57,686)$545,480 
Agency mortgage-backed securities50,226 — (5,630)44,596 
Corporate debt securities122,820 243 (9,619)113,444 
          Total securities held-to-maturity$772,962 $3,493 $(72,935)$703,520 
Allowance for credit losses(314)
          Total securities held-to-maturity, net$772,648 

 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$750,434 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities at June 30, 2024, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately four years.
Available for saleHeld to maturity
($ in thousands)Amortized CostEstimated Fair ValueAmortized CostEstimated Fair Value
Due in one year or less$168,521 $166,950 $5,322 $5,205 
Due after one year through five years293,374 275,862 124,793 115,538 
Due after five years through ten years182,181 156,953 159,925 154,200 
Due after ten years362,352 297,157 432,696 383,981 
Agency mortgage-backed securities782,236 719,008 50,226 44,596 
 $1,788,664 $1,615,930 $772,962 $703,520 
Schedule of Unrealized Loss on Investments
The following tables presents a summary of available-for-sale investment securities in an unrealized loss position:
 June 30, 2024
Less than 12 months12 months or moreTotal
($ in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of U.S. Government-sponsored enterprises$20,179 $85 $259,528 $19,590 $279,707 $19,675 
Obligations of states and political subdivisions1,905 32 405,833 86,070 407,738 $86,102 
Agency mortgage-backed securities124,783 1,207 533,940 62,406 658,723 $63,613 
U.S. Treasury bills61,914 134 95,914 2,809 157,828 $2,943 
Corporate debt securities— — 7,830 920 7,830 $920 
 $208,781 $1,458 $1,303,045 $171,795 $1,511,826 $173,253 
 December 31, 2023
Less than 12 months12 months or moreTotal
($ 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