Debt Securities Held to Maturity (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Debt securities, held-to-maturity

Debt securities held to maturity at December 31, 2022 and 2021 are summarized as follows:

	December 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Allowance for Credit Losses		Fair Value
	(In thousands)
U.S. government and agency obligations	$	49,871	$	—	$	(7,304)	$	—	$	42,567
Mortgage-backed securities and collateralized mortgage obligations	371,652		—		(43,828)		—		327,824
	$	421,523	$	—	$	(51,132)	$	—	$	370,391

	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Fair Value
	(In thousands)
U.S. government and agency obligations	$	44,870	$	—	$	(759)	$	44,111
Mortgage-backed securities and collateralized mortgage obligations	384,864		6,741		(927)		390,678
	$	429,734	$	6,741	$	(1,686)	$	434,789

Investments classified by contractual maturity date

The amortized cost and fair value of debt securities available for sale at December 31, 2022, by contractual final maturity, is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer.

	December 31, 2022
	Amortized Cost		Fair Value
	(In thousands)
One year or less	$	921	$	906
More than one year to five years	84,351		79,080
More than five years to ten years	78,740		66,921
	$	164,012	$	146,907
Mortgage-backed securities and collateralized mortgage obligations	1,351,929		1,181,727
	$	1,515,941	$	1,328,634

Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer.

	December 31, 2022
	Amortized Cost		Fair Value
	(In thousands)
More than one year to five years	$	19,875	$	18,399
More than five years to ten years	19,996		16,703
More than ten years	10,000		7,465
	49,871		42,567
Mortgage-backed securities and collateralized mortgage obligations	371,652		327,824
	$	421,523	$	370,391

Schedule of unrealized loss on investments

The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at December 31, 2022 and 2021 and if the unrealized loss position was continuous for the twelve months prior to those respective dates:

	December 31, 2022
	Less Than 12 Months				12 Months or Longer				Total
	Fair Value		Gross Unrealized (Losses)		Fair Value		Gross Unrealized (Losses)		Fair Value		Gross Unrealized (Losses)
	(In thousands)
U.S. government and agency obligations	$	4,956	$	(44)	$	37,611	$	(7,260)	$	42,567	$	(7,304)
Mortgage-backed securities and collateralized mortgage obligations	275,107		(33,000)		52,717		(10,828)		327,824		(43,828)
	$	280,063	$	(33,044)	$	90,328	$	(18,088)	$	370,391	$	(51,132)

	December 31, 2021
	Less than 12 months				12 months or longer				Total
	Fair Value		Gross Unrealized (Losses)		Fair Value		Gross Unrealized (Losses)		Fair Value		Gross Unrealized (Losses)
	(In thousands)
U.S. government and agency obligations	$	44,111	$	(759)	$	—	$	—	$	44,111	$	(759)
Mortgage-backed securities and collateralized mortgage obligations	79,036		(927)		—		—		79,036		(927)
	$	123,147	$	(1,686)	$	—	$	—	$	123,147	$	(1,686)