Securities (Tables)

3 Months Ended

Mar. 31, 2022

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities Available for Sale

	March 31, 2022								December 31, 2021
			Gross		Gross						Gross		Gross
Securities Available for Sale	Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
(in thousands)	Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
U.S. Treasury and government agency securities	$	10,037	$	—	$	406	$	9,631	$	420,857	$	3,781	$	5,340	$	419,298
Municipal obligations		214,611		1,542		519		215,634		304,536		13,184		3,562		314,158
Residential mortgage-backed securities		2,949,998		4,535		193,111		2,761,422		3,056,763		29,158		50,123		3,035,798
Commercial mortgage-backed securities		3,089,562		2,587		197,976		2,894,173		3,064,828		61,645		48,614		3,077,859
Collateralized mortgage obligations		94,294		—		3,074		91,220		119,046		1,837		—		120,883
Corporate debt securities		21,500		32		605		20,927		18,500		210		8		18,702
	$	6,380,002	$	8,696	$	395,691	$	5,993,007	$	6,984,530	$	109,815	$	107,647	$	6,986,698

Amortized Cost and Fair Value of Debt Securities Held to Maturity

	March 31, 2022								December 31, 2021
			Gross		Gross						Gross		Gross
Securities Held to Maturity	Amortized		Unrealized		Unrealized		Fair		Amortized		Unrealized		Unrealized		Fair
(in thousands)	Cost		Gains		Losses		Value		Cost		Gains		Losses		Value
U.S. Treasury and government agency securities	$	368,334	$	—	$	14,745	$	353,589	$	14,857	$	—	$	20	$	14,837
Municipal obligations		696,275		5,986		7,492		694,769		621,405		37,941		205		659,141
Residential mortgage-backed securities		525,039		211		23,814		501,436		268,907		682		1,499		268,090
Commercial mortgage-backed securities		836,060		1,775		19,998		817,837		603,156		28,679		669		631,166
Collateralized mortgage obligations		62,380		47		1,009		61,418		57,426		822		—		58,248
	$	2,488,088	$	8,019	$	67,058	$	2,429,049	$	1,565,751	$	68,124	$	2,393	$	1,631,482

Proceeds from Gross Gains on and Gross Losses on Sale of Securities

The following table presents the proceeds from, gross gains on, and gross losses on sales of securities during the three months ended March 31, 2022 and 2021. Net gains or losses are reflected in the Securities Transactions, Net line items on the Consolidated Statements of Income.

	Three Months Ended March 31,
(in thousands)	2022			2021
Proceeds	$	73,219		$	—
Gross gains		—			—
Gross losses		87			—
Net loss	$	(87	)	$	—

Available for Sale Securities [Member]

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

Debt Securities Available for Sale	Amortized		Fair
(in thousands)	Cost		Value
Due in one year or less	$	691	$	694
Due after one year through five years		687,364		681,925
Due after five years through ten years		2,902,497		2,715,517
Due after ten years		2,789,450		2,594,871
Total available for sale debt securities	$	6,380,002	$	5,993,007

Securities with Unrealized Losses

Available for Sale
March 31, 2022	Losses < 12 months				Losses 12 months or >				Total
(in thousands)	Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
U.S. Treasury and government agency securities	$	9,631	$	406	$	—	$	—	$	9,631	$	406
Municipal obligations		63,349		519		—		—		63,349		519
Residential mortgage-backed securities		1,359,065		65,035		1,195,222		128,076		2,554,287		193,111
Commercial mortgage-backed securities		1,762,250		91,931		802,289		106,045		2,564,539		197,976
Collateralized mortgage obligations		91,220		3,074		—		—		91,220		3,074
Corporate debt securities		15,895		605		—		—		15,895		605
	$	3,301,410	$	161,570	$	1,997,511	$	234,121	$	5,298,921	$	395,691

Available for Sale
December 31, 2021	Losses < 12 months				Losses 12 months or >				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(in thousands)	Value		Losses		Value		Losses		Value		Losses
U.S. Treasury and government agency securities	$	198,318		2,305	$	63,534	$	3,035	$	261,852	$	5,340
Municipal obligations		43,021		2,372		25,126		1,190		68,147		3,562
Residential mortgage-backed securities		1,293,179		20,581		819,596		29,541		2,112,775		50,122
Commercial mortgage-backed securities		786,206		14,819		665,687		33,796		1,451,893		48,615
Collateralized mortgage obligations		—		—		—		—		—		—
Corporate debt securities		6,992		8		—		—		6,992		8
	$	2,327,716	$	40,085	$	1,573,943	$	67,562	$	3,901,659	$	107,647

At e

Held-to-maturity Securities [Member]

Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]

Amortized Cost and Fair Value of Debt Securities by Contractual Maturity

Debt Securities Held to Maturity	Amortized		Fair
(in thousands)	Cost		Value
Due in one year or less	$	11,225	$	11,248
Due after one year through five years		379,981		379,671
Due after five years through ten years		891,327		873,478
Due after ten years		1,205,555		1,164,652
Total held to maturity securities	$	2,488,088	$	2,429,049

Securities with Unrealized Losses

Held to maturity
March 31, 2022	Losses < 12 months				Losses 12 months or >				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(in thousands)	Value		Losses		Value		Losses		Value		Losses
U.S. Treasury and government agency securities	$	282,780	$	11,386	$	70,808	$	3,360	$	353,588	$	14,746
Municipal obligations		124,523		3,410		42,807		4,082		167,330		7,492
Residential mortgage-backed securities		482,145		22,993		6,727		820		488,872		23,813
Commercial mortgage-backed securities		551,422		18,637		10,931		1,361		562,353		19,998
Collateralized mortgage obligations		50,719		1,009		—		—		50,719		1,009
	$	1,491,589	$	57,435	$	131,273	$	9,623	$	1,622,862	$	67,058

Held to maturity
December 31, 2021	Losses < 12 months				Losses 12 months or >				Total
			Gross				Gross				Gross
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(in thousands)	Value		Losses		Value		Losses		Value		Losses
U.S. Treasury and government agency securities	$	14,837	$	20	$	—	$	—	$	14,837	$	20
Municipal obligations		7,795		205		—		—		7,795		205
Residential mortgage-backed securities		253,661		1,499		—		—		253,661		1,499
Commercial mortgage-backed securities		56,366		205		11,837		464		68,203		669
Collateralized mortgage obligations		—		—		—		—		—		—
	$	332,659	$	1,929	$	11,837	$	464	$	344,496	$	2,393