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Investments (Tables)
 3 Months Ended
Mar. 31, 2021
Investments [Abstract]  
Schedule of debt securities available-for-sale
The following table presents a summary of investment securities at March 31, 2021 and December 31, 2020:
 Amortized
Cost		UnrealizedFair
Value
GainsLosses
(In thousands)
At March 31, 2021
Investment securities available-for-sale at fair value:
U.S. government and agencies$19,964 $650 $— $20,614 
Government-sponsored entities137,866 3,619 — 141,485 
Municipal bonds325,312 17,668 (585)342,395 
Mortgage-backed securities (1)836,253 12,198 (13,537)834,914 
Total$1,319,395 $34,135 $(14,122)$1,339,408 
Investment securities held-to-maturity at amortized cost:
Mortgage-backed securities (1)$31,943 $688 $— $32,631 
Total$31,943 $688 $— $32,631 
Equity securities at fair value:
Money market mutual funds (2)$39,708 $— $— $39,708 
Total$39,708 $— $— $39,708 
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 
_____________________
(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 table presents a summary of investment securities at March 31, 2021 and December 31, 2020:
 Amortized
Cost		UnrealizedFair
Value
GainsLosses
(In thousands)
At March 31, 2021
Investment securities available-for-sale at fair value:
U.S. government and agencies$19,964 $650 $— $20,614 
Government-sponsored entities137,866 3,619 — 141,485 
Municipal bonds325,312 17,668 (585)342,395 
Mortgage-backed securities (1)836,253 12,198 (13,537)834,914 
Total$1,319,395 $34,135 $(14,122)$1,339,408 
Investment securities held-to-maturity at amortized cost:
Mortgage-backed securities (1)$31,943 $688 $— $32,631 
Total$31,943 $688 $— $32,631 
Equity securities at fair value:
Money market mutual funds (2)$39,708 $— $— $39,708 
Total$39,708 $— $— $39,708 
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 
_____________________
(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 table presents the maturities of Investment securities available-for-sale, based on contractual maturity, as of March 31, 2021. 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 amortization are expected to have shorter lives.
 
Investment Securities Available-for-sale
Amortized
Cost		Fair
Value
(In thousands)
Within one year$78,206 $79,090 
After one, but within five years258,270 267,989 
After five, but within ten years227,730 237,588 
Greater than ten years755,189 754,741 
Total$1,319,395 $1,339,408 
The following table presents the maturities of Investment securities held-to-maturity, based on contractual maturity, as of March 31, 2021.
 
Investment Securities Held-to-maturity
Amortized
Cost		Fair
Value
(In thousands)
After five, but within ten years$26,376 $26,970 
Greater than ten years5,567 5,661 
Total$31,943 $32,631 
The following table presents the maturities of Equity securities, based on contractual maturity, as of March 31, 2021.
 Equity Securities
Amortized
Cost		Fair
Value
(In thousands)
Within one year$39,708 $39,708 
Total$39,708 $39,708 
Schedule of unrealized loss on investments
The following tables present information regarding securities at March 31, 2021 and December 31, 2020 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 March 31, 2021, there were no Investment securities held-to-maturity having temporary impairment.
Less than 12 months12 months or longerTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		# of
Securities
(In thousands, except number of securities)
March 31, 2021
Investment securities available-for-sale
Municipal bonds$26,139 $(585)$— $— $26,139 $(585)9 
Mortgage-backed securities (1) 436,241 (13,456)4,989 (81)441,230 (13,537)59 
Total$462,380 $(14,041)$4,989 $(81)$467,369 $(14,122)68 
Less than 12 months12 months or longerTotal
Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		Fair
Value		Unrealized
Losses		# 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 
_____________________
(1)All Mortgage-backed securities are guaranteed by the U.S. government, U.S. government agencies, or government-sponsored entities.