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, 2022:
U.S. Treasuries	$	272,416	$	—	$	(6,778)	$	265,638
U.S. Government agencies		245,972		—		(26,884)		219,088
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,996,405		—		(298,052)		1,698,353
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		708,337		—		(107,292)		601,045
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,196,700		2,542		(198,844)		1,000,398
State and municipal obligations		1,269,525		1,210		(205,883)		1,064,852
Small Business Administration loan-backed securities		491,203		302		(46,695)		444,810
Corporate securities		35,583		—		(2,945)		32,638
	$	6,216,141	$	4,054	$	(893,373)	$	5,326,822
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

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

$

—

$

—

$

205,822

$

201,700

Due after one year through five years

101,112

93,106

387,280

369,174

Due after five years through ten years

370,429

327,045

1,144,740

998,177

Due after ten years

2,211,700

1,830,017

4,478,299

3,757,771

$

2,683,241

$

2,250,168

$

6,216,141

$

5,326,822

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, 2022:
Securities Held to Maturity
U.S. Government agencies	$	5,514	$	78,833	$	24,273	$	88,642
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		65,181		513,086		189,912		823,467
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		30,284		277,868		39,380		127,128
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		14,318		82,895		51,986		213,387
Small Business Administration loan-backed securities		—		—		12,225		44,862
	$	115,297	$	952,682	$	317,776	$	1,297,486
Securities Available for Sale
U.S. Treasuries	$	6,778	$	265,638	$	—	$	—
U.S. Government agencies		8,193		138,807		18,691		80,281
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		42,767		459,773		255,285		1,238,580
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		21,450		274,082		85,842		326,963
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		17,156		206,228		181,688		767,002
State and municipal obligations		97,084		616,631		108,799		391,848
Small Business Administration loan-backed securities		2,152		92,535		44,543		264,933
Corporate securities		2,209		28,374		736		4,264
	$	197,789	$	2,082,068	$	695,584	$	3,073,871
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

Summary of net (losses) gains on trading securities


	Year Ended December 31,
(Dollars in thousands)	2022		2021		2020
Net (losses) gains on sales transaction	$	(1,326)	$	1,326	$	1,184
Net mark to mark losses		(237)		(273)		(57)
Net (losses) gains on trading securities	$	(1,563)	$	1,053	$	1,127