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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2023
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 September 30,Nine Months Ended September 30,
(In Thousands)2023202220232022
Unrealized gain (loss) on marketable equity securities$12 $33 ($445)($1,199)
Gain on sale of marketable equity securities, net— — — — 
   Total$12 $33 ($445)($1,199)
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
September 30, 2023    
Securities available for sale    
U.S. Treasury and government sponsored entities$614,215 $— ($35,580)$— $578,635 
Municipal securities820 — (11)— 809 
Corporate bonds14,015 50 (587)— 13,478 
Collateralized loan obligations60,164 — (936)— 59,228 
Total securities available for sale$689,214 $50 ($37,114)$— $652,150 
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesAllowance for Credit LossesFair Value
December 31, 2022    
Securities available for sale    
U.S. Treasury and government sponsored entities$634,582 $1 ($39,422)$— $595,161 
Municipal securities820 — (25)— 795 
Corporate bonds24,281 37 (674)— 23,644 
Collateralized loan obligations59,434 — (2,005)— 57,429 
Total securities available for sale$719,117 $38 ($42,126)$— $677,029 
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
December 31, 2022
Securities held to maturity
Corporate bonds$36,750 $— ($4,111)$32,639 
   Allowance for credit losses— — — — 
Total securities held to maturity, net of ACL$36,750 $— ($4,111)$32,639 
Summary of Held-To-Maturity Securities
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
September 30, 2023
Securities held to maturity
Corporate bonds$36,750 $— ($4,517)$32,233 
   Allowance for credit losses— — — — 
Total securities held to maturity, net of ACL$36,750 $— ($4,517)$32,233 
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesAllowance for Credit LossesFair Value
December 31, 2022    
Securities available for sale    
U.S. Treasury and government sponsored entities$634,582 $1 ($39,422)$— $595,161 
Municipal securities820 — (25)— 795 
Corporate bonds24,281 37 (674)— 23,644 
Collateralized loan obligations59,434 — (2,005)— 57,429 
Total securities available for sale$719,117 $38 ($42,126)$— $677,029 
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
December 31, 2022
Securities held to maturity
Corporate bonds$36,750 $— ($4,111)$32,639 
   Allowance for credit losses— — — — 
Total securities held to maturity, net of ACL$36,750 $— ($4,111)$32,639 
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 September 30, 2023 and December 31, 2022 were as follows:

Less Than 12 MonthsMore Than 12 MonthsTotal
(In Thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
September 30, 2023
Securities available for sale
     U.S. Treasury and government sponsored entities$42,827 ($658)$535,809 ($34,922)$578,636 ($35,580)
     Corporate bonds— — 6,431 (587)6,431 (587)
     Collateralized loan obligations9,874 (126)49,354 (810)59,228 (936)
     Municipal securities— — 809 (11)809 (11)
          Total$52,701 ($784)$592,403 ($36,330)$645,104 ($37,114)
December 31, 2022:
Securities available for sale
     U.S. Treasury and government sponsored entities$282,319 ($8,876)$302,840 ($30,546)$585,159 ($39,422)
     Corporate bonds13,216 (43)4,394 (631)17,610 (674)
     Collateralized loan obligations22,309 (632)35,120 (1,373)57,429 (2,005)
     Municipal securities795 (25)— — 795 (25)
          Total$318,639 ($9,576)$342,354 ($32,550)$660,993 ($42,126)
Schedule of Amortized Cost and Fair Value by Contractual Maturity
The amortized cost and estimated fair values of debt securities at September 30, 2023, 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$134,494 $132,302 
1-5 years479,721 446,333 
Total$614,215 $578,635 
Corporate bonds  
Within 1 year$2,000 $1,981 
1-5 years22,015 20,836 
5-10 years26,750 25,842 
Total$50,765 $48,659 
Collateralized loan obligations
5-10 years$29,670 $29,450 
Over 10 years30,494 29,778 
Total$60,164 $59,228 
Municipal securities  
Within 1 year$820 $809 
Total$820 $809 
Summary of Interest Income On Available-for-Sale Investment Securities
A summary of interest income for the three and nine-month periods ending September 30, 2023 and 2022, on available for sale investment securities are as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(In Thousands)2023202220232022
US Treasury and government sponsored entities$2,794 $2,137 $8,424 $4,375 
Other1,214 781 3,505 1,595 
Total taxable interest income$4,008 $2,918 $11,929 $5,970 
Municipal securities$4 $4 $13 $13 
Total tax-exempt interest income$4 $4 $13 $13 
Total$4,012 $2,922 $11,942 $5,983