Securities (Tables)

3 Months Ended

Mar. 31, 2025

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, 2025								December 31, 2024
			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	$	208,408	$	2,303	$	1,651	$	209,060	$	185,827	$	349	$	3,894	$	182,282
Municipal obligations		197,366		2		3,640		193,728		200,272		—		3,942		196,330
Residential mortgage-backed securities		2,505,037		4,200		311,852		2,197,385		2,482,109		496		353,554		2,129,051
Commercial mortgage-backed securities		2,882,206		7,645		204,652		2,685,199		2,849,372		2,185		250,592		2,600,965
Collateralized mortgage obligations		34,528		—		1,824		32,704		37,553		—		2,306		35,247
Corporate debt securities		17,500		—		1,048		16,452		19,000		—		1,384		17,616
Total	$	5,845,045	$	14,150	$	524,667	$	5,334,528	$	5,774,133	$	3,030	$	615,672	$	5,161,491

Amortized Cost and Fair Value of Debt Securities Held to Maturity

	March 31, 2025								December 31, 2024
			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	$	389,904	$	221	$	37,288	$	352,837	$	394,689	$	—	$	45,876	$	348,813
Municipal obligations		585,857		61		17,395		568,523		623,907		169		20,867		603,209
Residential mortgage-backed securities		553,972		—		49,163		504,809		573,057		—		61,525		511,532
Commercial mortgage-backed securities		806,954		—		61,296		745,658		818,604		—		72,854		745,750
Collateralized mortgage obligations		23,754		—		954		22,800		25,406		—		1,184		24,222
Total	$	2,360,441	$	282	$	166,096	$	2,194,627	$	2,435,663	$	169	$	202,306	$	2,233,526

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	$	31,863	$	31,963
Due after one year through five years		971,094		950,634
Due after five years through ten years		2,336,366		2,146,246
Due after ten years		2,505,722		2,205,685
Total available for sale debt securities	$	5,845,045	$	5,334,528

Securities with Unrealized Losses

The fair value and gross unrealized losses for securities classified as available for sale with unrealized losses for the periods indicated follow.

Available for Sale
March 31, 2025	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	$	17,540	$	206	$	7,115	$	1,445	$	24,655	$	1,651
Municipal obligations		18,742		127		167,611		3,513		186,353		3,640
Residential mortgage-backed securities		138,747		718		1,543,488		311,134		1,682,235		311,852
Commercial mortgage-backed securities		72,632		531		2,191,851		204,121		2,264,483		204,652
Collateralized mortgage obligations		—		—		32,704		1,824		32,704		1,824
Corporate debt securities		—		—		14,452		1,048		14,452		1,048
Total	$	247,661	$	1,582	$	3,957,221	$	523,085	$	4,204,882	$	524,667

Available for Sale
December 31, 2024	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	$	130,453	$	2,243	$	7,247	$	1,651	$	137,700	$	3,894
Municipal obligations		24,149		247		170,110		3,695		194,259		3,942
Residential mortgage-backed securities		347,772		2,935		1,554,001		350,619		1,901,773		353,554
Commercial mortgage-backed securities		184,534		2,738		2,139,191		247,854		2,323,725		250,592
Collateralized mortgage obligations		—		—		35,247		2,306		35,247		2,306
Corporate debt securities		—		—		15,616		1,384		15,616		1,384
Total	$	686,908	$	8,163	$	3,921,412	$	607,509	$	4,608,320	$	615,672

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	$	110,832	$	110,453
Due after one year through five years		764,462		733,857
Due after five years through ten years		536,603		505,119
Due after ten years		948,544		845,198
Total held to maturity securities	$	2,360,441	$	2,194,627

Securities with Unrealized Losses

The fair value and gross unrealized losses for securities classified as held to maturity with unrealized losses for the periods indicated follow.

Held to Maturity
March 31, 2025	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	$	9,196	$	36	$	324,368	$	37,252	$	333,564	$	37,288
Municipal obligations		88,964		302		468,359		17,093		557,323		17,395
Residential mortgage-backed securities		—		—		504,809		49,163		504,809		49,163
Commercial mortgage-backed securities		—		—		745,658		61,296		745,658		61,296
Collateralized mortgage obligations		—		—		22,800		954		22,800		954
Total	$	98,160	$	338	$	2,065,994	$	165,758	$	2,164,154	$	166,096

Held to Maturity
December 31, 2024	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	$	27,660	$	840	$	321,154	$	45,036	$	348,814	$	45,876
Municipal obligations		82,028		451		497,999		20,416		580,027		20,867
Residential mortgage-backed securities		—		—		511,531		61,525		511,531		61,525
Commercial mortgage-backed securities		—		—		745,750		72,854		745,750		72,854
Collateralized mortgage obligations		—		—		24,222		1,184		24,222		1,184
Total	$	109,688	$	1,291	$	2,100,656	$	201,015	$	2,210,344	$	202,306