Securities (Tables)

6 Months Ended

Jun. 30, 2024

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

	June 30, 2024								December 31, 2023
			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	$	135,826	$	852	$	1,757	$	134,921	$	97,741	$	1,581	$	1,514	$	97,808
Municipal obligations		201,894		—		5,422		196,472		203,533		79		2,200		201,412
Residential mortgage-backed securities		2,420,963		77		361,908		2,059,132		2,440,411		2,734		329,279		2,113,866
Commercial mortgage-backed securities		2,781,190		2,349		268,939		2,514,600		2,683,872		7,176		253,576		2,437,472
Collateralized mortgage obligations		42,476		—		3,122		39,354		47,661		—		3,376		44,285
Corporate debt securities		23,500		—		2,765		20,735		23,500		—		3,148		20,352
Total	$	5,605,849	$	3,278	$	643,913	$	4,965,214	$	5,496,718	$	11,570	$	593,093	$	4,915,195

Amortized Cost and Fair Value of Debt Securities Held to Maturity

	June 30, 2024								December 31, 2023
			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	$	404,468	$	19	$	48,562	$	355,925	$	413,490	$	179	$	43,971	$	369,698
Municipal obligations		630,812		369		25,348		605,833		664,488		1,252		19,593		646,147
Residential mortgage-backed securities		614,200		—		65,661		548,539		654,262		—		59,223		595,039
Commercial mortgage-backed securities		892,436		—		81,803		810,633		920,048		—		75,803		844,245
Collateralized mortgage obligations		28,706		—		1,679		27,027		32,491		—		1,702		30,789
Total	$	2,570,622	$	388	$	223,053	$	2,347,957	$	2,684,779	$	1,431	$	200,292	$	2,485,918

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	$	101,999	$	101,229
Due after one year through five years		814,705		779,834
Due after five years through ten years		2,344,169		2,092,416
Due after ten years		2,344,976		1,991,735
Total available for sale debt securities	$	5,605,849	$	4,965,214

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
June 30, 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	$	77,053	$	98	$	7,442	$	1,659	$	84,495	$	1,757
Municipal obligations		21,941		400		174,531		5,022		196,472		5,422
Residential mortgage-backed securities		397,674		1,359		1,656,654		360,549		2,054,328		361,908
Commercial mortgage-backed securities		82,884		734		2,188,381		268,205		2,271,265		268,939
Collateralized mortgage obligations		—		—		39,353		3,122		39,353		3,122
Corporate debt securities		2,000		—		18,735		2,765		20,735		2,765
Total	$	581,552	$	2,591	$	4,085,096	$	641,322	$	4,666,648	$	643,913

Available for Sale
December 31, 2023	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	$	—	$	—	$	7,790	$	1,514	$	7,790	$	1,514
Municipal obligations		49,832		374		128,965		1,826		178,797		2,200
Residential mortgage-backed securities		3,062		25		1,795,154		329,254		1,798,216		329,279
Commercial mortgage-backed securities		—		—		2,227,703		253,576		2,227,703		253,576
Collateralized mortgage obligations		—		—		44,285		3,376		44,285		3,376
Corporate debt securities		—		—		19,852		3,148		19,852		3,148
Total	$	52,894	$	399	$	4,223,749	$	592,694	$	4,276,643	$	593,093

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	$	158,621	$	156,501
Due after one year through five years		790,154		740,272
Due after five years through ten years		569,629		530,008
Due after ten years		1,052,218		921,176
Total held to maturity securities	$	2,570,622	$	2,347,957

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
June 30, 2024	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	$	10,408	$	136	$	336,035	$	48,426	$	346,443	$	48,562
Municipal obligations		52,420		583		531,341		24,765		583,761		25,348
Residential mortgage-backed securities		—		—		548,539		65,661		548,539		65,661
Commercial mortgage-backed securities		—		—		810,633		81,803		810,633		81,803
Collateralized mortgage obligations		—		—		27,027		1,679		27,027		1,679
Total	$	62,828	$	719	$	2,253,575	$	222,334	$	2,316,403	$	223,053

Held to maturity
December 31, 2023	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	$	9,530	$	63	$	339,533	$	43,908	$	349,063	$	43,971
Municipal obligations		343,401		1,801		226,165		17,792		569,566		19,593
Residential mortgage-backed securities		—		—		595,039		59,223		595,039		59,223
Commercial mortgage-backed securities		—		—		844,245		75,803		844,245		75,803
Collateralized mortgage obligations		—		—		30,789		1,702		30,789		1,702
Total	$	352,931	$	1,864	$	2,035,771	$	198,428	$	2,388,702	$	200,292