Securities (Tables)

6 Months Ended

Jun. 30, 2023

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, 2023								December 31, 2022
			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	$	113,195	$	—	$	3,343	$	109,852	$	113,211	$	—	$	2,346	$	110,865
Municipal obligations		205,306		40		4,841		200,505		207,014		59		3,981		203,092
Residential mortgage-backed securities		2,507,541		141		381,119		2,126,563		2,655,381		224		398,619		2,256,986
Commercial mortgage-backed securities		3,232,868		1,773		339,425		2,895,216		3,234,278		2,032		342,880		2,893,430
Collateralized mortgage obligations		68,773		—		6,043		62,730		76,830		—		6,242		70,588
Corporate debt securities		23,500		—		3,677		19,823		23,500		—		2,420		21,080
Total	$	6,151,183	$	1,954	$	738,448	$	5,414,689	$	6,310,214	$	2,315	$	756,488	$	5,556,041

Amortized Cost and Fair Value of Debt Securities Held to Maturity

	June 30, 2023								December 31, 2022
			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	$	422,789	$	96	$	49,405	$	373,480	$	426,454	$	21	$	49,044	$	377,431
Municipal obligations		683,143		669		26,561		657,251		698,908		753		26,558		673,103
Residential mortgage-backed securities		694,693		—		71,754		622,939		734,478		—		72,532		661,946
Commercial mortgage-backed securities		942,272		—		91,213		851,059		948,691		—		87,211		861,480
Collateralized mortgage obligations		38,093		—		2,566		35,527		43,964		—		2,526		41,438
Total	$	2,780,990	$	765	$	241,499	$	2,540,256	$	2,852,495	$	774	$	237,871	$	2,615,398

Proceeds from Gross Gains on and Gross Losses on Sale of Securities

The following table presents the proceeds from, gross gains on, and gross losses on sales of securities during the six months ended June 30, 2023 and 2022. Net gains or losses are reflected in the "Securities transactions, net" line item on the Consolidated Statements of Income.

	Six Months Ended  June 30,
($ in thousands)	2023		2022
Proceeds	$	—	$	73,219
Gross gains		—		—
Gross losses		—		87
Net loss	$	—	$	(87	)

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	$	2,667	$	2,607
Due after one year through five years		1,007,425		951,597
Due after five years through ten years		3,021,049		2,693,028
Due after ten years		2,120,042		1,767,457
Total available for sale debt securities	$	6,151,183	$	5,414,689

Securities with Unrealized Losses

Available for Sale
June 30, 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	$	101,949	$	1,770	$	7,903	$	1,573	$	109,852	$	3,343
Municipal obligations		114,411		2,165		84,699		2,676		199,110		4,841
Residential mortgage-backed securities		131,220		6,308		1,989,035		374,811		2,120,255		381,119
Commercial mortgage-backed securities		275,914		16,436		2,567,305		322,989		2,843,219		339,425
Collateralized mortgage obligations		—		—		62,730		6,043		62,730		6,043
Corporate debt securities		1,690		310		17,633		3,367		19,323		3,677
Total	$	625,184	$	26,989	$	4,729,305	$	711,459	$	5,354,489	$	738,448

Available for Sale
December 31, 2022	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	$	102,607		754	$	8,258	$	1,592	$	110,865	$	2,346
Municipal obligations		192,334		3,981		—		—		192,334		3,981
Residential mortgage-backed securities		636,060		49,790		1,611,832		348,829		2,247,892		398,619
Commercial mortgage-backed securities		1,489,974		114,195		1,351,530		228,685		2,841,504		342,880
Collateralized mortgage obligations		41,703		3,275		28,884		2,967		70,587		6,242
Corporate debt securities		13,194		1,306		7,386		1,114		20,580		2,420
Total	$	2,475,872	$	173,301	$	3,007,890	$	583,187	$	5,483,762	$	756,488

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	$	6,636	$	6,478
Due after one year through five years		665,030		629,029
Due after five years through ten years		836,716		768,352
Due after ten years		1,272,608		1,136,397
Total held to maturity securities	$	2,780,990	$	2,540,256

Securities with Unrealized Losses

Held to maturity
June 30, 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	$	63,206	$	3,175	$	295,332	$	46,230	$	358,538	$	49,405
Municipal obligations		429,205		5,865		192,626		20,696		621,831		26,561
Residential mortgage-backed securities		215,171		12,457		407,768		59,297		622,939		71,754
Commercial mortgage-backed securities		119,234		6,908		731,825		84,305		851,059		91,213
Collateralized mortgage obligations		—		—		35,527		2,566		35,527		2,566
Total	$	826,816	$	28,405	$	1,663,078	$	213,094	$	2,489,894	$	241,499

Held to maturity
December 31, 2022	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	$	145,893	$	13,245	$	226,499	$	35,799	$	372,392	$	49,044
Municipal obligations		560,288		8,878		64,346		17,680		624,634		26,558
Residential mortgage-backed securities		391,146		30,515		270,800		42,017		661,946		72,532
Commercial mortgage-backed securities		697,827		56,899		163,653		30,312		861,480		87,211
Collateralized mortgage obligations		41,438		2,526		—		—		41,438		2,526
Total	$	1,836,592	$	112,063	$	725,298	$	125,808	$	2,561,890	$	237,871