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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Gross Realized and Unrealized Gains (Losses) on Marketable Equity Securities The gross realized and unrealized gains (losses) recognized on marketable equity securities in other operating income in the Company's Consolidated Statements of Income were as follows:
Three Months Ended June 30,Six Months Ended June 30,
(In Thousands)2024202320242023
Unrealized (loss) gain on marketable equity securities($60)($234)$254 ($457)
Gain on sale of marketable equity securities, net— — — — 
   Total($60)($234)$254 ($457)
Summary of Available-For-Sale Securities The following table summarizes the amortized cost, estimated fair value, and the Allowance for Credit Losses ("ACL") of debt securities and the corresponding amounts of gross unrealized gains and losses of available-for-sale securities recognized in accumulated other comprehensive income (loss) and gross unrecognized gains and losses of held to maturity securities at the periods indicated:
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesAllowance for Credit LossesFair Value
June 30, 2024    
Securities available for sale    
U.S. Treasury and government sponsored entities$546,492 $277 ($21,086)$— $525,683 
Corporate bonds9,012 41 (360)— 8,693 
Collateralized loan obligations50,693 30 (135)— 50,588 
Total securities available for sale$606,197 $348 ($21,581)$— $584,964 
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesAllowance for Credit LossesFair Value
December 31, 2023    
Securities available for sale    
U.S. Treasury and government sponsored entities$587,639 $451 ($23,965)$— $564,125 
Municipal securities820 — (4)— 816 
Corporate bonds14,014 28 (418)— 13,624 
Collateralized loan obligations59,795 12 (436)— 59,371 
Total securities available for sale$662,268 $491 ($24,823)$— $637,936 
Summary of Held-To-Maturity Securities
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
June 30, 2024
Securities held to maturity
Corporate bonds$36,750 $— ($3,041)$33,709 
   Allowance for credit losses— — — — 
Total securities held to maturity, net of ACL$36,750 $— ($3,041)$33,709 
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
December 31, 2023
Securities held to maturity
Corporate bonds$36,750 $— ($3,337)$33,413 
   Allowance for credit losses— — — — 
Total securities held to maturity, net of ACL$36,750 $— ($3,337)$33,413 
Gross Unrealized Losses on Available For Sale Securities and the Fair Value
Gross unrealized losses on available for sale securities and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2024 and December 31, 2023 were as follows:

Less Than 12 MonthsMore Than 12 MonthsTotal
(In Thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
March 31, 2024
Securities available for sale
     U.S. Treasury and government sponsored entities$24,736 ($328)$480,666 ($20,758)$505,402 ($21,086)
     Corporate bonds— — 4,653 (360)4,653 (360)
     Collateralized loan obligations— — 9,859 (135)9,859 (135)
          Total$24,736 ($328)$495,178 ($21,253)$519,914 ($21,581)
December 31, 2023:
Securities available for sale
     U.S. Treasury and government sponsored entities$9,997 ($3)$528,574 ($23,962)$538,571 ($23,965)
     Corporate bonds— — 6,599 (418)6,599 (418)
     Collateralized loan obligations3,909 (91)43,149 (345)47,058 (436)
     Municipal securities— — 816 (4)816 (4)
          Total$13,906 ($94)$579,138 ($24,729)$593,044 ($24,823)
Schedule of Amortized Cost and Fair Value by Contractual Maturity
The amortized cost and estimated fair values of debt securities at June 30, 2024, are distributed by contractual maturity as shown below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. 
(In Thousands)Amortized CostFair Value
US Treasury and government sponsored entities  
Within 1 year$188,089 $184,712 
1-5 years358,403 340,971 
Total$546,492 $525,683 
Corporate bonds  
Within 1 year$3,999 $4,040 
1-5 years15,013 14,453 
5-10 years26,750 23,909 
Total$45,762 $42,402 
Collateralized loan obligations
5-10 years$31,693 $31,583 
Over 10 years19,000 19,005 
Total$50,693 $50,588 
Summary of Interest Income On Available-for-Sale Investment Securities
A summary of interest income for the three and six-month periods ending June 30, 2024 and 2023, on available for sale investment securities are as follows:
Three Months Ended June 30,Six Months Ended June 30,
(In Thousands)2024202320242023
US Treasury and government sponsored entities$2,499 $2,835 $5,068 $5,630 
Other1,057 1,156 2,203 2,291 
Total taxable interest income$3,556 $3,991 $7,271 $7,921 
Municipal securities$— $5 $3 $9 
Total tax-exempt interest income$— $5 $3 $9 
Total$3,556 $3,996 $7,274 $7,930