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Investments (Tables)
 6 Months Ended
Jun. 30, 2023
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, 2023
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
Obligations of U.S. Government-sponsored enterprises$300,450 $12 $(27,320)$273,142 
Obligations of states and political subdivisions502,171 39 (79,842)422,368 
Agency mortgage-backed securities717,605 144 (67,007)650,742 
U.S. Treasury bills201,256 — (4,605)196,651 
Corporate debt securities8,750 — (1,278)7,472 
          Total securities available for sale$1,730,232 $195 $(180,052)$1,550,375 
Held-to-maturity securities:
Obligations of states and political subdivisions$546,025 $3,168 $(57,023)$492,170 
Agency mortgage-backed securities54,768 — (6,232)48,536 
Corporate debt securities124,024 189 (11,775)112,438 
          Total securities held-to-maturity$724,817 $3,357 $(75,030)$653,144 
Allowance for credit losses(858)
          Total securities held-to-maturity, net$723,959 
 December 31, 2022
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$266,090 $— $(28,305)$237,785 
    Obligations of states and political subdivisions507,842 27 (90,425)417,444 
    Agency mortgage-backed securities727,931 453 (68,980)659,404 
U.S. Treasury Bills213,441 1 (4,908)208,534 
Corporate debt securities13,750 — (1,110)12,640 
          Total securities available for sale$1,729,054 $481 $(193,728)$1,535,807 
Held-to-maturity securities:
   Obligations of states and political subdivisions$529,012 $2,321 $(65,347)$465,986 
   Agency mortgage-backed securities57,018 — (6,416)50,602 
Corporate debt securities124,620 163 (12,854)111,929 
          Total securities held to maturity$710,650 $2,484 $(84,617)$628,517 
Allowance for credit losses(735)
Total securities held-to-maturity, net$709,915 
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, 2023
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
Obligations of U.S. Government-sponsored enterprises$300,450 $12 $(27,320)$273,142 
Obligations of states and political subdivisions502,171 39 (79,842)422,368 
Agency mortgage-backed securities717,605 144 (67,007)650,742 
U.S. Treasury bills201,256 — (4,605)196,651 
Corporate debt securities8,750 — (1,278)7,472 
          Total securities available for sale$1,730,232 $195 $(180,052)$1,550,375 
Held-to-maturity securities:
Obligations of states and political subdivisions$546,025 $3,168 $(57,023)$492,170 
Agency mortgage-backed securities54,768 — (6,232)48,536 
Corporate debt securities124,024 189 (11,775)112,438 
          Total securities held-to-maturity$724,817 $3,357 $(75,030)$653,144 
Allowance for credit losses(858)
          Total securities held-to-maturity, net$723,959 
 December 31, 2022
(in thousands)Amortized CostGross
Unrealized Gains		Gross
Unrealized Losses		Fair Value
Available-for-sale securities:    
    Obligations of U.S. Government-sponsored enterprises$266,090 $— $(28,305)$237,785 
    Obligations of states and political subdivisions507,842 27 (90,425)417,444 
    Agency mortgage-backed securities727,931 453 (68,980)659,404 
U.S. Treasury Bills213,441 1 (4,908)208,534 
Corporate debt securities13,750 — (1,110)12,640 
          Total securities available for sale$1,729,054 $481 $(193,728)$1,535,807 
Held-to-maturity securities:
   Obligations of states and political subdivisions$529,012 $2,321 $(65,347)$465,986 
   Agency mortgage-backed securities57,018 — (6,416)50,602 
Corporate debt securities124,620 163 (12,854)111,929 
          Total securities held to maturity$710,650 $2,484 $(84,617)$628,517 
Allowance for credit losses(735)
Total securities held-to-maturity, net$709,915 
Investments Classified by Contractual Maturity Date
The amortized cost and estimated fair value of debt securities at June 30, 2023, 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 ValueAmortized CostEstimated Fair Value
Due in one year or less$103,168 $102,696 $1,220 $1,218 
Due after one year through five years367,426 340,209 60,531 55,811 
Due after five years through ten years99,210 88,070 187,374 176,372 
Due after ten years442,823 368,658 420,924 371,207 
Agency mortgage-backed securities717,605 650,742 54,768 48,536 
 $1,730,232 $1,550,375 $724,817 $653,144 
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, 2023
Less than 12 months12 months or moreTotal
(in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of U.S. Government-sponsored enterprises$48,444 $1,048 $221,131 $26,272 $269,575 $27,320 
Obligations of states and political subdivisions2,324 191 417,374 79,651 419,698 79,842 
Agency mortgage-backed securities151,797 5,165 473,248 61,842 625,045 67,007 
U.S. Treasury bills118,732 1,231 77,919 3,374 196,651 4,605 
Corporate debt securities1,807 193 5,665 1,085 7,472 1,278 
 $323,104 $7,828 $1,195,337 $172,224 $1,518,441 $180,052 
 December 31, 2022
Less than 12 months12 months or moreTotal
(in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
Obligations of U.S. Government-sponsored enterprises$73,738 $6,249 $163,047 $22,056 $236,785 $28,305 
Obligations of states and political subdivisions103,179 13,501 311,634 76,924 414,813 90,425 
Agency mortgage-backed securities334,431 20,038 281,321 48,942 615,752 68,980 
U.S. Treasury bills198,688 4,908 — — 198,688 4,908 
Corporate debt securities12,640 1,110 — — 12,640 1,110 
 $722,676 $45,806 $756,002 $147,922 $1,478,678 $193,728