Securities (Tables)

9 Months Ended

Sep. 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

	September 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	$	171,333	$	3,806	$	1,371	$	173,768	$	97,741	$	1,581	$	1,514	$	97,808
Municipal obligations		201,128		55		1,824		199,359		203,533		79		2,200		201,412
Residential mortgage-backed securities		2,469,381		6,687		280,396		2,195,672		2,440,411		2,734		329,279		2,113,866
Commercial mortgage-backed securities		2,839,988		13,836		185,916		2,667,908		2,683,872		7,176		253,576		2,437,472
Collateralized mortgage obligations		39,950		—		1,964		37,986		47,661		—		3,376		44,285
Corporate debt securities		23,500		—		2,046		21,454		23,500		—		3,148		20,352
Total	$	5,745,280	$	24,384	$	473,517	$	5,296,147	$	5,496,718	$	11,570	$	593,093	$	4,915,195

Amortized Cost and Fair Value of Debt Securities Held to Maturity

	September 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	$	400,115	$	661	$	34,673	$	366,103	$	413,490	$	179	$	43,971	$	369,698
Municipal obligations		628,365		915		15,255		614,025		664,488		1,252		19,593		646,147
Residential mortgage-backed securities		593,502		—		43,613		549,889		654,262		—		59,223		595,039
Commercial mortgage-backed securities		824,601		—		55,404		769,197		920,048		—		75,803		844,245
Collateralized mortgage obligations		27,050		—		1,006		26,044		32,491		—		1,702		30,789
Total	$	2,473,633	$	1,576	$	149,951	$	2,325,258	$	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	$	66,226	$	66,092
Due after one year through five years		946,854		934,210
Due after five years through ten years		2,292,196		2,121,901
Due after ten years		2,440,004		2,173,944
Total available for sale debt securities	$	5,745,280	$	5,296,147

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
September 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	$	7,982	$	17	$	7,545	$	1,354	$	15,527	$	1,371
Municipal obligations		2,820		—		174,748		1,824		177,568		1,824
Residential mortgage-backed securities		38,596		72		1,674,765		280,324		1,713,361		280,396
Commercial mortgage-backed securities		—		—		2,246,784		185,916		2,246,784		185,916
Collateralized mortgage obligations		—		—		37,986		1,964		37,986		1,964
Corporate debt securities		—		—		19,454		2,046		19,454		2,046
Total	$	49,398	$	89	$	4,161,282	$	473,428	$	4,210,680	$	473,517

Available for Sale
December 31, 2023	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	$	—	$	—	$	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	$	95,237	$	94,381
Due after one year through five years		791,983		763,985
Due after five years through ten years		581,877		554,189
Due after ten years		1,004,536		912,703
Total held to maturity securities	$	2,473,633	$	2,325,258

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
September 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	$	—	$	—	$	336,218	$	34,673	$	336,218	$	34,673
Municipal obligations		21,719		53		498,414		15,202		520,133		15,255
Residential mortgage-backed securities		—		—		549,890		43,613		549,890		43,613
Commercial mortgage-backed securities		—		—		769,197		55,404		769,197		55,404
Collateralized mortgage obligations		—		—		26,044		1,006		26,044		1,006
Total	$	21,719	$	53	$	2,179,763	$	149,898	$	2,201,482	$	149,951

Held to Maturity
December 31, 2023	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	$	9,530	$	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