Debt Securities Held to Maturity (Tables)

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost, gross unrealized gains, gross unrealized losses and the fair value of securities held-to-maturity

Debt securities held to maturity at September 30, 2023 and December 31, 2022 are summarized as follows:

	September 30, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Allowance for Credit Losses		Fair Value
U.S. government and agency obligations	$	49,871	$	—	$	(7,981)	$	—	$	41,890
Mortgage-backed securities and collateralized mortgage obligations	362,074		—		(52,037)		—		310,037
	$	411,945	$	—	$	(60,018)	$	—	$	351,927

	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

Schedule of securities by contractual maturity

The amortized cost and fair value of debt securities available for sale at September 30, 2023, 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.

	September 30, 2023
	Amortized Cost		Fair Value
	(In thousands)
One year or less	$	35,265	$	35,218
More than one year to five years	87,687		84,301
More than five years to ten years	68,715		54,600
	$	191,667	$	174,119
Mortgage-backed securities and collateralized mortgage obligations	1,026,493		844,260
	$	1,218,160	$	1,018,379

The amortized cost and fair value of debt securities held to maturity at September 30, 2023, 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.

	September 30, 2023
	Amortized Cost		Fair Value
	(In thousands)
More than one year to five years	$	29,875	$	26,783
More than five years to ten years	9,996		8,022
More than ten years	10,000		7,085
	49,871		41,890
Mortgage-backed securities and collateralized mortgage obligations	362,074		310,037
	$	411,945	$	351,927

Schedule of held-to-maturity securities reported in a continuous unrealized loss position

The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at September 30, 2023 and December 31, 2022 and if the unrealized loss position was continuous for the twelve months prior to those respective dates:

	September 30, 2023
	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	$	—	$	—	$	41,890	$	(7,981)	$	41,890	$	(7,981)
Mortgage-backed securities and collateralized mortgage obligations	14		(1)		310,023		(52,036)		310,037		(52,037)
	$	14	$	(1)	$	351,913	$	(60,017)	$	351,927	$	(60,018)

7.    Debt Securities Held to Maturity (continued)

	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)