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INVESTMENT SECURITIES (Tables)
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Debt Securities Available for sale
The following tables present a summary of investment securities:
 Amortized
Cost
UnrealizedFair
Value
GainsLosses
(In thousands)
At December 31, 2020
Investment securities available-for-sale at fair value:
U.S. government and agencies$19,962 $1,022 $ $20,984 
Government-sponsored entities142,985 4,801  147,786 
Municipal bonds324,422 22,177 (11)346,588 
Mortgage-backed securities (1)711,144 17,805 (614)728,335 
Total$1,198,513 $45,805 $(625)$1,243,693 
Investment securities held-to-maturity at amortized cost:
Mortgage-backed securities (1)$35,223 $719 $ $35,942 
Total$35,223 $719 $ $35,942 
Equity securities at fair value:
Money market mutual funds (2)$41,452 $ $ $41,452 
Total$41,452 $ $ $41,452 

 Amortized
Cost
UnrealizedFair
Value
GainsLosses
(In thousands)
At December 31, 2019
Investment securities available-for-sale at fair value:
U.S. government and agencies$19,955 $42 $(57)$19,940 
Government-sponsored entities154,963 1,292 — 156,255 
Municipal bonds312,977 12,551 (73)325,455 
Mortgage-backed securities (1)479,005 1,117 (3,488)476,634 
Total$966,900 $15,002 $(3,618)$978,284 
Investment securities held-to-maturity at amortized cost:
Mortgage-backed securities (1)48,212 53 (316)47,949 
Total$48,212 $53 $(316)$47,949 
Equity securities at fair value:
Money market mutual funds (2)$18,810 $— $— $18,810 
Total$18,810 $— $— $18,810 
_________________
(1)All Mortgage-backed securities are guaranteed by the U.S. government, U.S. government agencies, or government-sponsored entities.
(2)Money market mutual funds maintain a constant net asset value of $1.00 and therefore have no unrealized gain or loss.
Schedule of Debt Securities Held-to-maturity
The following tables present a summary of investment securities:
 Amortized
Cost
UnrealizedFair
Value
GainsLosses
(In thousands)
At December 31, 2020
Investment securities available-for-sale at fair value:
U.S. government and agencies$19,962 $1,022 $ $20,984 
Government-sponsored entities142,985 4,801  147,786 
Municipal bonds324,422 22,177 (11)346,588 
Mortgage-backed securities (1)711,144 17,805 (614)728,335 
Total$1,198,513 $45,805 $(625)$1,243,693 
Investment securities held-to-maturity at amortized cost:
Mortgage-backed securities (1)$35,223 $719 $ $35,942 
Total$35,223 $719 $ $35,942 
Equity securities at fair value:
Money market mutual funds (2)$41,452 $ $ $41,452 
Total$41,452 $ $ $41,452 

 Amortized
Cost
UnrealizedFair
Value
GainsLosses
(In thousands)
At December 31, 2019
Investment securities available-for-sale at fair value:
U.S. government and agencies$19,955 $42 $(57)$19,940 
Government-sponsored entities154,963 1,292 — 156,255 
Municipal bonds312,977 12,551 (73)325,455 
Mortgage-backed securities (1)479,005 1,117 (3,488)476,634 
Total$966,900 $15,002 $(3,618)$978,284 
Investment securities held-to-maturity at amortized cost:
Mortgage-backed securities (1)48,212 53 (316)47,949 
Total$48,212 $53 $(316)$47,949 
Equity securities at fair value:
Money market mutual funds (2)$18,810 $— $— $18,810 
Total$18,810 $— $— $18,810 
_________________
(1)All Mortgage-backed securities are guaranteed by the U.S. government, U.S. government agencies, or government-sponsored entities.
(2)Money market mutual funds maintain a constant net asset value of $1.00 and therefore have no unrealized gain or loss.
Investments Classified by Contractual Maturity Date
The following tables present the maturities of Investment securities available-for-sale, based on contractual maturity, and the weighted average yields of such securities as of December 31, 2020. Certain securities are callable before their final maturity. Additionally, certain securities (such as Mortgage-backed securities) are shown within the table below based on their final (contractual) maturity, but due to prepayments and curtailments are expected to have shorter lives.
 U.S. government and agencies (1)Government-sponsored entities (1)
Amortized
cost
Fair
value
Weighted
average
yield
Amortized
cost
Fair
value
Weighted
average
yield
(In thousands, except percentages)
Within one year$— $— — %$27,776 $28,107 1.89 %
After one, but within five years10,000 10,337 1.75 %100,116 103,336 1.99 %
After five, but within ten years9,962 10,647 1.70 %15,093 16,343 2.00 %
Greater than ten years— — — %— — — %
Total$19,962 $20,984 1.72 %$142,985 $147,786 1.97 %

 Municipal bonds (1)Mortgage-backed securities (2)
Amortized
cost
Fair
value
Weighted
average
yield
Amortized
cost
Fair
value
Weighted
average
yield
(In thousands, except percentages)
Within one year$10,582 $10,676 2.16 %$9,310 $9,341 2.22 %
After one, but within five years10,678 10,895 2.39 %170,295 179,035 2.16 %
After five, but within ten years87,513 93,603 2.60 %121,639 127,337 2.12 %
Greater than ten years215,649 231,414 2.43 %409,900 412,622 1.44 %
Total$324,422 $346,588 2.47 %$711,144 $728,335 1.74 %
The following table presents the maturities of Investment securities held-to-maturity, based on contractual maturity, and the weighted average yields of such securities as of December 31, 2020:
 Mortgage-backed securities (2)
Amortized
cost
Fair
value
Weighted
average
yield
(In thousands, except percentages)
Within one year$— $— — %
After one, but within five years— — — %
After five, but within ten years28,858 29,449 2.23 %
Greater than ten years6,365 6,493 2.48 %
Total$35,223 $35,942 2.28 %
_________________
(1)Certain securities are callable before their final maturity. 
(2)Mortgage-backed securities are shown based on their final (contractual) maturity, but, due to prepayments, they are expected to have shorter lives.
The weighted average remaining maturity at December 31, 2020 was 11.4 years for Investment securities available-for-sale, with $274.5 million of Investment securities available-for-sale callable before maturity. The weighted average remaining maturity at December 31, 2019 was 7.7 years for Investment securities available-for-sale, with $239.0 million of Investment securities available-for-sale callable before maturity.
The weighted average remaining maturity for Investment securities held-to-maturity was 9.0 years and 10.0 years at December 31, 2020 and December 31, 2019, respectively.
The following table presents the maturities of Equity securities at fair value, based on contractual maturity, and the weighted average yields of such securities as of December 31, 2020:
 Money market mutual funds
Amortized
cost
Fair
value
Weighted
average
yield
(In thousands)
Within one year$41,452 $41,452 0.40 %
After one, but within five years— — — %
After five, but within ten years— — — %
Greater than ten years— — — %
Total$41,452 $41,452 0.40 %
Realized Gain (Loss) on Investments
The following table presents the proceeds from sales, gross realized gains, and gross realized losses for Investment securities available-for-sale that were sold or called during the following periods, as well as changes in fair value of equity securities as prescribed by ASC 321, Investment- Equity Securities. ASU 2016-01, Recognition and Measurements of Financial Assets and Financial Liabilities was adopted on January 1, 2018, at which time a cumulative effect adjustment of $339 thousand was recorded to reclassify the amount of accumulated unrealized gains related to equity securities from Accumulated other comprehensive income to Retained earnings.
 Year Ended December 31,
202020192018
(In thousands)
Proceeds from sales (1)$ $— $53,412 
Realized gains — 
Realized losses — (597)
Change in unrealized gain/(loss) on equity securities reflected in the Consolidated Statements of Operations (2) — (23)
_________________
(1) Purchases and sales of money market mutual funds in operational accounts are excluded from this table.
(2) Money market mutual funds maintain a constant net asset value of $1.00 and therefore have no unrealized gain or loss.
(3) There have been no sales of Investment securities available-for-sale or Equity securities in the years ended December 31, 2020 and 2019.
Schedule of Unrealized Loss on Investments
The following tables present information regarding securities at December 31, 2020 and 2019 having temporary impairment due to the fair values having declined below the amortized cost of the individual securities and the time period that the investments have been temporarily impaired. As of December 31, 2020, there were no Investment securities held-to-maturity in an unrealized loss position.
Less than 12 months12 months or longerTotal
Fair
value
Unrealized
losses
Fair
value
Unrealized
losses
Fair
value
Unrealized
losses
Number of
securities
(In thousands, except number of securities)
December 31, 2020
Investment securities available-for-sale
Municipal bonds$2,344 $(11)$ $ $2,344 $(11)2 
Mortgage-backed securities (1)126,545 (519)5,411 (95)131,956 (614)41 
Total$128,889 $(530)$5,411 $(95)$134,300 $(625)43 
Less than 12 months12 months or longerTotal
Fair
value
Unrealized
losses
Fair
value
Unrealized
losses
Fair
value
Unrealized
losses
Number of
securities
(In thousands, except number of securities)
December 31, 2019
Investment securities available-for-sale
U.S. government and agencies$9,899 $(57)$— $— $9,899 $(57)
Government-sponsored entities1,725 — — — 1,725 — 
Municipal bonds9,149 (73)— — 9,149 (73)
Mortgage-backed securities (1)140,723 (1,016)187,043 (2,472)327,766 (3,488)85 
Total$161,496 $(1,146)$187,043 $(2,472)$348,539 $(3,618)91 
Investment securities held-to-maturity
Mortgage-backed securities (1)$10,328 $(11)$30,451 $(305)$40,779 $(316)14 
Total$10,328 $(11)$30,451 $(305)$40,779 $(316)14 
___________________
(1)All Mortgage-backed securities are guaranteed by the U.S. government, U.S. government agencies, or government-sponsored entities.
Fair Value, Concentration of Risk
The following table presents the concentration of securities with any one issuer that exceeds 10% of shareholders’ equity as of December 31, 2020:
 Amortized costFair value
(In thousands)
Federal Home Loan Mortgage Corporation$405,243 $419,653 
Federal Home Loan Bank88,802 91,761 
Federal National Mortgage Association331,881 336,644 
Total$825,926 $848,058