Securities

Schedule of amortized cost and fair value of investment securities available for sale


			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
(Dollars in thousands)	Cost		Gains		Losses		Value
December 31, 2021:
U.S. Government agencies	$	98,882	$	—	$	(1,765)	$	97,117
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,851,700		5,324		(25,985)		1,831,039
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		730,949		5,957		(10,911)		725,995
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,220,233		5,438		(18,430)		1,207,241
State and municipal obligations		798,211		16,697		(2,219)		812,689
Small Business Administration loan-backed securities		502,812		2,330		(4,479)		500,663
Corporate securities		18,509		234		(9)		18,734
	$	5,221,296	$	35,980	$	(63,798)	$	5,193,478
December 31, 2020:
U.S. Government agencies	$	29,882	$	16	$	(642)	$	29,256
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,351,506		16,657		(1,031)		1,367,132
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		739,797		16,579		(825)		755,551
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		229,219		10,939		(50)		240,108
State and municipal obligations		502,575		17,491		(27)		520,039
Small Business Administration loan-backed securities		401,496		4,978		(1,590)		404,884
Corporate securities		13,562		140		—		13,702
	$	3,268,037	$	66,800	$	(4,165)	$	3,330,672

Schedule of amortized cost and fair value of debt and equity securities by contractual maturity

Securities

Held to Maturity

Available for Sale

Amortized

Fair

Amortized

Fair

(Dollars in thousands)

Cost

Value

Cost

Value

Due in one year or less

$

—

$

—

$

7,263

$

7,296

Due after one year through five years

—

132,157

133,418

Due after five years through ten years

140,439

135,931

920,768

919,669

Due after ten years

1,679,462

1,642,133

4,161,108

4,133,095

$

1,819,901

$

1,778,064

$

5,221,296

$

5,193,478

Schedule of securities with gross unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position


	Less Than				Twelve Months
	Twelve Months				or More
	Gross Unrealized		Fair		Gross Unrealized		Fair
(Dollars in thousands)	Losses		Value		Losses		Value
December 31, 2021:
Securities Held to Maturity
U.S. Government agencies	$	1,745	$	86,168	$	882	$	24,118
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		18,768		868,327		5,510		184,819
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		4,937		169,240		—		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		4,902		154,963		3,119		75,450
Small Business Administration loan-backed securities		1,281		37,408		1,011		22,890
	$	31,633	$	1,316,106	$	10,522	$	307,277
Securities Available for Sale
U.S. Government agencies	$	529	$	73,353	$	1,236	$	23,763
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		17,381		1,274,934		8,604		221,435
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		10,911		432,300		—		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		13,120		846,581		5,310		98,106
State and municipal obligations		1,867		123,987		352		8,579
Small Business Administration loan-backed securities		2,720		179,168		1,759		110,309
Corporate securities		9		4,991		—		—
	$	46,537	$	2,935,314	$	17,261	$	462,192
December 31, 2020:
Securities Held to Maturity
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises	$	1,032	$	213,146	$	—	$	—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		91		27,445		—		—
	$	1,123	$	240,591	$	—	$	—
Securities Available for Sale
U.S. Government agencies	$	642	$	24,358	$	—	$	—
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,031		260,411		—		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		825		140,333		—		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		46		13,594		4		871
State and municipal obligations		27		8,620		—		—
Small Business Administration loan-backed securities		573		94,981		1,017		104,254

$

3,144

$

542,297

$

1,021

$

105,125