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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2020
Marketable Securities [Abstract]  
Summary of Investment Security Carrying and Fair Value The carrying values and approximate fair values of investment securities at the periods indicated are presented below:
(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 
December 31, 2019    
Securities available for sale    
U.S. Treasury and government sponsored entities$210,756 $1,133 ($37)$211,852 
Municipal securities3,288 9 — 3,297 
Corporate bonds34,764 302 — 35,066 
Collateralized loan obligations25,980 — (57)25,923 
Total securities available for sale$274,788 $1,444 ($94)$276,138 
Schedule of Gross Unrealized Losses on Investment Securities Gross unrealized losses on investment 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 December 31, 2020 and 2019, were as follows:
 Less Than 12 MonthsMore Than 12 MonthsTotal
(In Thousands)Fair
Value		Unrealized LossesFair
Value		Unrealized LossesFair
Value		Unrealized Losses
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)
2019      
Securities Available for Sale      
U.S. Treasury and government sponsored entities$39,797 ($33)$2,996 ($4)$42,793 ($37)
Collateralized loan obligations14,972 (17)7,951 (40)22,923 (57)
Total$54,769 ($50)$10,947 ($44)$65,716 ($94)
Schedule of Amortized Cost and Fair Value by Contractual Maturity The amortized cost and fair values of available for sale and held to maturity debt securities at December 31, 2020, 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 ValueWeighted Average Yield
U.S. Treasury and government sponsored entities   
Within 1 year$44,044 $44,601 2.06 %
1-5 years129,274 130,000 0.82 %
Total$173,318 $174,601 1.14 %
Corporate bonds   
Within 1 year$2,241 $2,257 1.23 %
1-5 years27,710 28,235 1.36 %
5-10 years10,000 10,000 5.00 %
Total$39,951 $40,492 2.26 %
Collateralized loan obligations   
5-10 years$8,783 $8,720 1.70 %
Over 10 years32,999 32,964 1.60 %
Total$41,782 $41,684 1.62 %
Municipal securities   
1-5 years820 856 2.14 %
Total$820 $856 2.14 %
Schedule of Proceeds, Gains, and Losses for Investment Securities The proceeds and resulting gains and losses, computed using specific identification, from sales of investment securities for the years ending December 31, 2020, 2019, and 2018, respectively, are as follows: 
(In Thousands)ProceedsGross GainsGross Losses
2020   
Available for sale securities$— $— $— 
2019   
Available for sale securities$4,219 $23 $— 
2018   
Available for sale securities$— $— $— 
Summary of Interest Income on Available-For-Sale Investment Securities A summary of interest income for the years ending December 31, 2020, 2019, and 2018 on available for sale investment securities is as follows:
(In Thousands)202020192018
U.S. Treasury and government sponsored entities$3,396 $4,170 $3,682 
Other1,354 2,282 1,532 
Total taxable interest income$4,750 $6,452 $5,214 
Municipal securities$82 $120 $267 
Total tax-exempt interest income$82 $120 $267 
Total$4,832 $6,572 $5,481