Securities (Tables)

9 Months Ended

Sep. 30, 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

	September 30, 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	$	290,196	$	3,391	$	1,594	$	291,993	$	185,827	$	349	$	3,894	$	182,282
Municipal obligations		193,771		90		728		193,133		200,272		—		3,942		196,330
Residential mortgage-backed securities		2,578,927		9,188		272,605		2,315,510		2,482,109		496		353,554		2,129,051
Commercial mortgage-backed securities		3,093,658		13,912		159,154		2,948,416		2,849,372		2,185		250,592		2,600,965
Collateralized mortgage obligations		29,402		—		1,374		28,028		37,553		—		2,306		35,247
Corporate debt securities		17,500		—		910		16,590		19,000		—		1,384		17,616
Total	$	6,203,454	$	26,581	$	436,365	$	5,793,670	$	5,774,133	$	3,030	$	615,672	$	5,161,491

Amortized Cost and Fair Value of Debt Securities Held to Maturity

	September 30, 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	$	379,390	$	230	$	32,414	$	347,206	$	394,689	$	—	$	45,876	$	348,813
Municipal obligations		545,276		619		12,206		533,689		623,907		169		20,867		603,209
Residential mortgage-backed securities		516,257		—		38,581		477,676		573,057		—		61,525		511,532
Commercial mortgage-backed securities		735,969		—		50,025		685,944		818,604		—		72,854		745,750
Collateralized mortgage obligations		20,719		—		643		20,076		25,406		—		1,184		24,222
Total	$	2,197,611	$	849	$	133,869	$	2,064,591	$	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	$	30,778	$	30,776
Due after one year through five years		1,612,998		1,576,482
Due after five years through ten years		1,904,156		1,787,534
Due after ten years		2,655,522		2,398,878
Total debt securities available for sale	$	6,203,454	$	5,793,670

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.

	September 30, 2025
Available for Sale	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	$	32,243	$	109	$	14,382	$	1,485	$	46,625	$	1,594
Municipal obligations		—		—		133,878		728		133,878		728
Residential mortgage-backed securities		37		—		1,515,716		272,605		1,515,753		272,605
Commercial mortgage-backed securities		1,023		6		2,265,794		159,148		2,266,817		159,154
Collateralized mortgage obligations		—		—		28,029		1,374		28,029		1,374
Corporate debt securities		2,000		—		14,590		910		16,590		910
Total	$	35,303	$	115	$	3,972,389	$	436,250	$	4,007,692	$	436,365

	December 31, 2024
Available for Sale	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	$	134,954	$	133,941
Due after one year through five years		680,676		660,373
Due after five years through ten years		507,188		482,174
Due after ten years		874,793		788,103
Total debt securities held to maturity	$	2,197,611	$	2,064,591

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.

	September 30, 2025
Held to Maturity	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	$	—	$	—	$	328,482	$	32,414	$	328,482	$	32,414
Municipal obligations		50,829		30		360,613		12,176		411,442		12,206
Residential mortgage-backed securities		—		—		477,676		38,581		477,676		38,581
Commercial mortgage-backed securities		—		—		685,944		50,025		685,944		50,025
Collateralized mortgage obligations		—		—		20,076		643		20,076		643
Total	$	50,829	$	30	$	1,872,791	$	133,839	$	1,923,620	$	133,869

	December 31, 2024
Held to Maturity	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