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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2021
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)2021202020212020
Unrealized gain (loss) on marketable equity securities($67)$375 $27 ($347)
Gain on sale of marketable equity securities, net36 — 67 98 
   Total($31)$375 $94 ($249)
Summary of Available-For-Sale Securities The following table summarizes the amortized cost, estimated fair value, and 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, 2021    
Securities available for sale    
U.S. Treasury and government sponsored entities$300,674 $465 ($1,315)$— $299,824 
Municipal securities820 30 — — 850 
Corporate bonds34,969 462 (20)— 35,411 
Collateralized loan obligations43,038 23 (24)— 43,037 
Total securities available for sale$379,501 $980 ($1,359)$— $379,122 
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
December 31, 2020    
Securities available for sale    
U.S. Treasury and government sponsored entities$173,318 $1,330 ($47)$174,601 
Municipal securities820 36 — 856 
Corporate bonds29,951 546 (5)30,492 
Collateralized loan obligations41,782 44 (142)41,684 
Total securities available for sale$245,871 $1,956 ($194)$247,633 
Securities held to maturity    
Corporate bonds$10,000 $— $— $10,000 
Total securities held to maturity$10,000 $— $— $10,000 
Summary of Held-To-Maturity Securities
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
September 30, 2021
Securities held to maturity
Corporate bonds$20,000 $— ($736)$19,264 
   Allowance for credit losses— — — — 
Total securities held to maturity, net of ACL$20,000 $— ($736)$19,264 
(In Thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
December 31, 2020    
Securities available for sale    
U.S. Treasury and government sponsored entities$173,318 $1,330 ($47)$174,601 
Municipal securities820 36 — 856 
Corporate bonds29,951 546 (5)30,492 
Collateralized loan obligations41,782 44 (142)41,684 
Total securities available for sale$245,871 $1,956 ($194)$247,633 
Securities held to maturity    
Corporate bonds$10,000 $— $— $10,000 
Total securities held to maturity$10,000 $— $— $10,000 
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, 2021 and December 31, 2020 were as follows:

Less Than 12 MonthsMore Than 12 MonthsTotal
(In Thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
September 30, 2021:
Securities available for sale
     U.S. Treasury and government sponsored entities$276,140 ($1,315)$— $— $276,140 ($1,315)
     Corporate bonds$5,013 ($20)$— $— $5,013 ($20)
     Collateralized loan obligations4,976 (24)— — 4,976 (24)
          Total$286,129 ($1,359)$— $— $286,129 ($1,359)
December 31, 2020:
Securities available for sale
     U.S. Treasury and government sponsored entities$31,270 ($47)$— $— $31,270 ($47)
     Corporate bonds3,198 (5)— — 3,198 (5)
     Collateralized loan obligations23,670 (118)2,967 (24)26,637 (142)
          Total$58,138 ($170)$2,967 ($24)$61,105 ($194)
Schedule of Amortized Cost and Fair Value by Contractual Maturity
The amortized cost and estimated fair values of debt securities at September 30, 2021, 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$4,998 $5,076 
1-5 years285,356 284,446 
5-10 years10,320 10,302 
Total$300,674 $299,824 
Corporate bonds  
Within 1 year$2,240 $2,242 
1-5 years$37,696 $37,993 
5-10 years15,033 15,013 
Total$54,969 $55,248 
Collateralized loan obligations
5-10 years$43,038 $43,037 
Total$43,038 $43,037 
Municipal securities  
1-5 years$820 $850 
Total$820 $850 
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, 2021 and 2020, on available for sale investment securities are as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(In Thousands)2021202020212020
US Treasury and government sponsored entities$552 $680 $1,568 $2,839 
Other272 237 840 1,040 
Total taxable interest income$824 $917 $2,408 $3,879 
Municipal securities$4 $23 $13 $72 
Total tax-exempt interest income$4 $23 $13 $72 
Total$828 $940 $2,421 $3,951