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Securities (Tables)

3 Months Ended

Mar. 31, 2026

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, 2026												December 31, 2025
				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	$	279,080		$	4,562		$	1,175		$	282,467		$	266,825		$	3,705		$	1,198		$	269,332
Municipal obligations		180,786			49			692			180,143			191,754			82			508			191,328
Residential mortgage-backed securities		2,567,467			6,254			240,316			2,333,405			2,620,980			11,643			256,994			2,375,629
Commercial mortgage-backed securities		3,218,115			6,457			84,252			3,140,320			3,217,663			10,530			144,868			3,083,325
Collateralized mortgage obligations		24,998			—			1,184			23,814			27,100			—			1,154			25,946
Corporate debt securities		17,000			—			763			16,237			17,000			37			680			16,357
Total	$	6,287,446		$	17,322		$	328,382		$	5,976,386		$	6,341,322		$	25,997		$	405,402		$	5,961,917

Amortized Cost and Fair Value of Debt Securities Held to Maturity

	March 31, 2026												December 31, 2025
				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	$	368,667		$	271		$	29,171		$	339,767		$	373,605		$	248		$	30,143		$	343,710
Municipal obligations		457,346			370			11,556			446,160			511,516			708			11,455			500,769
Residential mortgage-backed securities		480,249			—			35,764			444,485			497,338			—			34,239			463,099
Commercial mortgage-backed securities		728,004			—			48,510			679,494			731,329			—			46,455			684,874
Collateralized mortgage obligations		17,362			—			539			16,823			19,094			—			520			18,574
Total	$	2,051,628		$	641		$	125,540		$	1,926,729		$	2,132,882		$	956		$	122,812		$	2,011,026

Proceeds from, Gross Gains on, and Gross Losses on Sales 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, 2026 and 2025. Net gains or losses are reflected in the "Securities transactions, net" line item on the Consolidated Statements of Income.

		Three Months Ended March 31,
($ in thousands)		2026				2025
Proceeds		$	1,414,258			$	—
Gross gains			7				—
Gross losses			98,602				—
Net loss		$	(98,595	)		$	—

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		$	35,304			$	35,323
Due after one year through five years			1,382,114				1,360,911
Due after five years through ten years			2,091,263				2,020,407
Due after ten years			2,778,765				2,559,745
Total		$	6,287,446			$	5,976,386

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, 2026		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		$	11,910		$	101			$	6,708		$	1,074			$	18,618		$	1,175
Municipal obligations			47,068			400				95,944			292				143,012			692
Residential mortgage-backed securities			395,000			3,778				1,283,981			236,538				1,678,981			240,316
Commercial mortgage-backed securities			1,758,136			19,383				829,335			64,869				2,587,471			84,252
Collateralized mortgage obligations			—			—				23,814			1,184				23,814			1,184
Corporate debt securities			2,989			11				13,248			752				16,237			763
Total		$	2,215,103		$	23,673			$	2,253,030		$	304,709			$	4,468,133		$	328,382

Available for Sale
December 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		$	17,468		$	9			$	14,677		$	1,189			$	32,145		$	1,198
Municipal obligations			—			—				124,852			508				124,852			508
Residential mortgage-backed securities			54,250			598				1,442,746			256,396				1,496,996			256,994
Commercial mortgage-backed securities			374,740			1,787				2,158,865			143,081				2,533,605			144,868
Collateralized mortgage obligations			—			—				25,946			1,154				25,946			1,154
Corporate debt securities			1,998			2				11,322			678				13,320			680
Total		$	448,456		$	2,396			$	3,778,408		$	403,006			$	4,226,864		$	405,402

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		$	139,208			$	138,554
Due after one year through five years			701,252				678,711
Due after five years through ten years			419,862				397,573
Due after ten years			791,306				711,891
Total		$	2,051,628			$	1,926,729

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, 2026		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		$	8,563		$	24			$	313,146		$	29,147			$	321,709		$	29,171
Municipal obligations			101,661			305				171,360			11,251				273,021			11,556
Residential mortgage-backed securities			—			—				444,485			35,764				444,485			35,764
Commercial mortgage-backed securities			—			—				679,494			48,510				679,494			48,510
Collateralized mortgage obligations			—			—				16,823			539				16,823			539
Total		$	110,224		$	329			$	1,625,308		$	125,211			$	1,735,532		$	125,540

Held to Maturity
December 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		$	—		$	—			$	316,814		$	30,143			$	316,814		$	30,143
Municipal obligations			98,559			97				325,241			11,358				423,800			11,455
Residential mortgage-backed securities			—			—				463,099			34,239				463,099			34,239
Commercial mortgage-backed securities			—			—				684,874			46,455				684,874			46,455
Collateralized mortgage obligations			—			—				18,574			520				18,574			520
Total		$	98,559		$	97			$	1,808,602		$	122,715			$	1,907,161		$	122,812

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