Loans (Tables)

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Loan composition

The period end loan composition was as follows.

	September 30, 2016		December 31, 2015
	($ in Thousands)
Commercial and industrial	$	6,721,557	$	6,190,683
Commercial real estate — owner occupied	892,678		918,212
Commercial and business lending	7,614,235		7,108,895
Commercial real estate — investor	3,530,370		3,234,266
Real estate construction	1,314,431		1,162,145
Commercial real estate lending	4,844,801		4,396,411
Total commercial	12,459,036		11,505,306
Residential mortgage	6,034,166		5,783,267
Home equity	951,594		1,005,802
Other consumer	399,209		419,968
Total consumer	7,384,969		7,209,037
Total loans	$	19,844,005	$	18,714,343

Commercial and consumer loans by credit quality indicator

The following table presents commercial and consumer loans by credit quality indicator at September 30, 2016.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	5,983,940	$	180,425	$	351,290	$	205,902	$	6,721,557
Commercial real estate - owner occupied	791,951		46,345		47,387		6,995		892,678
Commercial and business lending	6,775,891		226,770		398,677		212,897		7,614,235
Commercial real estate - investor	3,480,535		5,042		36,765		8,028		3,530,370
Real estate construction	1,303,013		8,625		1,929		864		1,314,431
Commercial real estate lending	4,783,548		13,667		38,694		8,892		4,844,801
Total commercial	11,559,439		240,437		437,371		221,789		12,459,036
Residential mortgage	5,973,633		3,832		3,226		53,475		6,034,166
Home equity	936,443		726		78		14,347		951,594
Other consumer	398,481		428		—		300		399,209
Total consumer	7,308,557		4,986		3,304		68,122		7,384,969
Total loans	$	18,867,996	$	245,423	$	440,675	$	289,911	$	19,844,005

The following table presents commercial and consumer loans by credit quality indicator at December 31, 2015.

	Pass		Special Mention		Potential Problem		Nonaccrual		Total
	($ in Thousands)
Commercial and industrial	$	5,522,809	$	341,169	$	233,130	$	93,575	$	6,190,683
Commercial real estate - owner occupied	835,572		38,885		35,706		8,049		918,212
Commercial and business lending	6,358,381		380,054		268,836		101,624		7,108,895
Commercial real estate - investor	3,153,703		45,976		25,944		8,643		3,234,266
Real estate construction	1,157,034		252		3,919		940		1,162,145
Commercial real estate lending	4,310,737		46,228		29,863		9,583		4,396,411
Total commercial	10,669,118		426,282		298,699		111,207		11,505,306
Residential mortgage	5,727,437		1,552		2,796		51,482		5,783,267
Home equity	988,574		1,762		222		15,244		1,005,802
Other consumer	419,087		556		—		325		419,968
Total consumer	7,135,098		3,870		3,018		67,051		7,209,037
Total loans	$	17,804,216	$	430,152	$	301,717	$	178,258	$	18,714,343

Summarized details of Loans

The following table presents loans by past due status at September 30, 2016.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Nonaccrual (b)		Total
	($ in Thousands)
Commercial and industrial	$	6,514,451	$	576	$	374	$	254	$	205,902	$	6,721,557
Commercial real estate - owner occupied	884,814		754		115		—		6,995		892,678
Commercial and business lending	7,399,265		1,330		489		254		212,897		7,614,235
Commercial real estate - investor	3,521,712		17		613		—		8,028		3,530,370
Real estate construction	1,313,165		337		65		—		864		1,314,431
Commercial real estate lending	4,834,877		354		678		—		8,892		4,844,801
Total commercial	12,234,142		1,684		1,167		254		221,789		12,459,036
Residential mortgage	5,973,994		6,407		290		—		53,475		6,034,166
Home equity	931,774		4,627		846		—		14,347		951,594
Other consumer	395,606		1,499		547		1,257		300		399,209
Total consumer	7,301,374		12,533		1,683		1,257		68,122		7,384,969
Total loans	$	19,535,516	$	14,217	$	2,850	$	1,511	$	289,911	$	19,844,005

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at September 30, 2016 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$215 million or 74% were current with respect to payment at September 30, 2016.

The following table presents loans by past due status at December 31, 2015.

	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due (a)		Nonaccrual (b)		Total
	($ in Thousands)
Commercial and industrial	$	6,095,848	$	602	$	409	$	249	$	93,575	$	6,190,683
Commercial real estate - owner occupied	903,021		7,142		—		—		8,049		918,212
Commercial and business lending	6,998,869		7,744		409		249		101,624		7,108,895
Commercial real estate - investor	3,225,332		291		—		—		8,643		3,234,266
Real estate construction	1,160,909		270		26		—		940		1,162,145
Commercial real estate lending	4,386,241		561		26		—		9,583		4,396,411
Total commercial	11,385,110		8,305		435		249		111,207		11,505,306
Residential mortgage	5,726,855		4,491		439		—		51,482		5,783,267
Home equity	982,639		6,190		1,729		—		15,244		1,005,802
Other consumer	416,374		1,195		675		1,399		325		419,968
Total consumer	7,125,868		11,876		2,843		1,399		67,051		7,209,037
Total loans	$	18,510,978	$	20,181	$	3,278	$	1,648	$	178,258	$	18,714,343

(a) The recorded investment in loans past due 90 days or more and still accruing totaled $2 million at December 31, 2015 (the same as the reported balances for the accruing loans noted above).

(b) Of the total nonaccrual loans,$124 million or 69% were current with respect to payment at December 31, 2015.

Summarized details of impaired Loans

The following table presents impaired loans at September 30, 2016.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	61,219	$	65,586	$	9,293	$	61,337	$	1,228
Commercial real estate — owner occupied	8,721		10,641		319		9,133		262
Commercial and business lending	69,940		76,227		9,612		70,470		1,490
Commercial real estate — investor	17,154		17,601		629		21,450		1,405
Real estate construction	1,229		1,626		449		1,301		49
Commercial real estate lending	18,383		19,227		1,078		22,751		1,454
Total commercial	88,323		95,454		10,690		93,221		2,944
Residential mortgage	65,381		70,568		12,087		66,845		1,734
Home equity	21,382		23,277		10,162		22,654		862
Other consumer	1,226		1,288		211		1,268		22
Total consumer	87,989		95,133		22,460		90,767		2,618
Total loans	$	176,312	$	190,587	$	33,150	$	183,988	$	5,562
Loans with no related allowance
Commercial and industrial	$	174,931	$	221,213	$	—	$	179,696	$	1,227
Commercial real estate — owner occupied	5,719		6,472		—		5,906		—
Commercial and business lending	180,650		227,685		—		185,602		1,227
Commercial real estate — investor	6,226		6,501		—		7,393		—
Real estate construction	—		—		—		—		—
Commercial real estate lending	6,226		6,501		—		7,393		—
Total commercial	186,876		234,186		—		192,995		1,227
Residential mortgage	6,143		6,289		—		6,206		133
Home equity	650		650		—		651		23
Other consumer	—		—		—		—		—
Total consumer	6,793		6,939		—		6,857		156
Total loans	$	193,669	$	241,125	$	—	$	199,852	$	1,383
Total
Commercial and industrial	$	236,150	$	286,799	$	9,293	$	241,033	$	2,455
Commercial real estate — owner occupied	14,440		17,113		319		15,039		262
Commercial and business lending	250,590		303,912		9,612		256,072		2,717
Commercial real estate — investor	23,380		24,102		629		28,843		1,405
Real estate construction	1,229		1,626		449		1,301		49
Commercial real estate lending	24,609		25,728		1,078		30,144		1,454
Total commercial	275,199		329,640		10,690		286,216		4,171
Residential mortgage	71,524		76,857		12,087		73,051		1,867
Home equity	22,032		23,927		10,162		23,305		885
Other consumer	1,226		1,288		211		1,268		22
Total consumer	94,782		102,072		22,460		97,624		2,774
Total impaired loans(a)	$	369,981	$	431,712	$	33,150	$	383,840	$	6,945

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 78% of the unpaid principal balance at September 30, 2016.

The following table presents impaired loans at December 31, 2015.

	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
	($ in Thousands)
Loans with a related allowance
Commercial and industrial	$	57,785	$	59,409	$	8,162	$	46,833	$	855
Commercial real estate — owner occupied	9,705		9,804		448		10,087		412
Commercial and business lending	67,490		69,213		8,610		56,920		1,267
Commercial real estate — investor	27,822		29,444		1,831		28,278		1,914
Real estate construction	1,450		2,154		453		1,667		66
Commercial real estate lending	29,272		31,598		2,284		29,945		1,980
Total commercial	96,762		100,811		10,894		86,865		3,247
Residential mortgage	66,590		71,084		12,462		68,183		2,374
Home equity	21,769		23,989		10,118		22,624		1,147
Other consumer	1,154		1,225		195		1,199		30
Total consumer	89,513		96,298		22,775		92,006		3,551
Total loans	$	186,275	$	197,109	$	33,669	$	178,871	$	6,798
Loans with no related allowance
Commercial and industrial	$	65,083	$	72,259	$	—	$	79,573	$	1,657
Commercial real estate — owner occupied	6,221		6,648		—		6,534		15
Commercial and business lending	71,304		78,907		—		86,107		1,672
Commercial real estate — investor	2,736		2,840		—		2,763		90
Real estate construction	—		—		—		—		—
Commercial real estate lending	2,736		2,840		—		2,763		90
Total commercial	74,040		81,747		—		88,870		1,762
Residential mortgage	4,762		5,033		—		4,726		126
Home equity	544		544		—		544		30
Other consumer	—		—		—		—		—
Total consumer	5,306		5,577		—		5,270		156
Total loans	$	79,346	$	87,324	$	—	$	94,140	$	1,918
Total
Commercial and industrial	$	122,868	$	131,668	$	8,162	$	126,406	$	2,512
Commercial real estate — owner occupied	15,926		16,452		448		16,621		427
Commercial and business lending	138,794		148,120		8,610		143,027		2,939
Commercial real estate — investor	30,558		32,284		1,831		31,041		2,004
Real estate construction	1,450		2,154		453		1,667		66
Commercial real estate lending	32,008		34,438		2,284		32,708		2,070
Total commercial	170,802		182,558		10,894		175,735		5,009
Residential mortgage	71,352		76,117		12,462		72,909		2,500
Home equity	22,313		24,533		10,118		23,168		1,177
Other consumer	1,154		1,225		195		1,199		30
Total consumer	94,819		101,875		22,775		97,276		3,707
Total impaired loans(a)	$	265,621	$	284,433	$	33,669	$	273,011	$	8,716

(a) The net recorded investment (defined as recorded investment, net of the related allowance) of the impaired loans represented 82% of the unpaid principal balance at December 31, 2015.

Nonaccrual and performing restructured loans

The following table presents nonaccrual and performing restructured loans by loan portfolio.

	September 30, 2016				December 31, 2015
	Performing Restructured Loans		Nonaccrual Restructured Loans(a)		Performing Restructured Loans		Nonaccrual Restructured Loans(a)
	($ in Thousands)
Commercial and industrial	$	30,248	$	2,398	$	29,293	$	1,714
Commercial real estate — owner occupied	7,445		2,275		7,877		2,703
Commercial real estate — investor	15,352		941		21,915		3,936
Real estate construction	365		154		510		177
Residential mortgage	18,049		22,743		19,870		24,592
Home equity	7,685		3,209		7,069		4,522
Other consumer	926		38		829		40
Total restructured loans	$	80,070	$	31,758	$	87,363	$	37,684

(a) Nonaccrual restructured loans have been included within nonaccrual loans.

Summary of restructured loans

The following table provides the number of loans modified in a troubled debt restructuring by loan portfolio during the nine months ended September 30, 2016 and 2015, and the recorded investment and unpaid principal balance as of September 30, 2016 and 2015.

	Nine Months Ended September 30, 2016					Nine Months Ended September 30, 2015
	Number of Loans	Recorded Investment(a)		Unpaid Principal Balance(b)		Number of Loans	Recorded Investment(a)		Unpaid Principal Balance(b)
	($ in Thousands)
Commercial and industrial	10	$	2,455	$	2,517	10	$	2,410	$	3,033
Commercial real estate — owner occupied	1	117		124		4	2,847		3,007
Commercial real estate — investor	—	—		—		3	2,949		2,998
Real estate construction	1	66		91		1	5		5
Residential mortgage	56	4,676		4,922		77	7,393		7,586
Home equity	47	1,709		1,793		61	2,109		2,220
Other consumer	1	15		16		—	—		—
Total	116	$	9,038	$	9,463	156	$	17,713	$	18,849

(a) Represents post-modification outstanding recorded investment.

(b) Represents pre-modification outstanding recorded investment.

Troubled debt restructurings subsequent redefault

The following table provides the number of loans modified in a troubled debt restructuring during the previous twelve months which subsequently defaulted during the nine months ended September 30, 2016 and 2015, as well as the recorded investment in these restructured loans as of September 30, 2016 and 2015.

	Nine Months Ended September 30, 2016			Nine Months Ended September 30, 2015
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	($ in Thousands)
Commercial and industrial	—	$	—	1	$	153
Commercial real estate — owner occupied	—	—		1	297
Residential mortgage	36	3,310		45	4,176
Home equity	12	182		21	627
Other consumer	1	15		—	—
Total	49	$	3,507	68	$	5,253

Changes in the allowance for loan losses by portfolio segment

For comparison purposes, a summary of the changes in the allowance for loan losses by portfolio segment for the year ended December 31, 2015, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate - investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2014	$	117,635		$	16,510		$	46,333		$	20,999		$	31,926		$	26,464		$	6,435		$	266,302
Charge offs	(27,687		)	(2,645		)	(4,645		)	(750		)	(5,636		)	(7,048		)	(3,869		)	(52,280		)
Recoveries	9,821			921			4,157			2,268			1,077			3,233			765			22,242
Net charge offs	(17,866		)	(1,724		)	(488		)	1,518			(4,559		)	(3,815		)	(3,104		)	(30,038		)
Provision for loan losses	30,190			3,894			(2,827		)	2,749			894			906			2,194			38,000
December 31, 2015	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Allowance for loan losses:
Individually evaluated for impairment	$	7,522		$	—		$	229		$	—		$	166		$	46		$	—		$	7,963
Collectively evaluated for impairment	122,437			18,680			42,789			25,266			28,095			23,509			5,525			266,301
Total allowance for loan losses	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Loans:
Individually evaluated for impairment	$	91,569		$	6,221		$	5,460		$	—		$	6,956		$	1,281		$	—		$	111,487
Collectively evaluated for impairment	6,099,114			911,991			3,228,806			1,162,145			5,776,311			1,004,521			419,968			18,602,856
Total loans	$	6,190,683		$	918,212		$	3,234,266		$	1,162,145		$	5,783,267		$	1,005,802		$	419,968		$	18,714,343

A summary of the changes in the allowance for loan losses by portfolio segment for the nine months ended September 30, 2016, was as follows.

$ in Thousands	Commercial and industrial			Commercial real estate - owner occupied			Commercial real estate - investor			Real estate construction			Residential mortgage			Home equity			Other consumer			Total
December 31, 2015	$	129,959		$	18,680		$	43,018		$	25,266		$	28,261		$	23,555		$	5,525		$	274,264
Charge offs	(63,368		)	(265		)	(1,495		)	(380		)	(3,035		)	(3,434		)	(2,853		)	(74,830		)
Recoveries	13,461			48			1,610			111			506			2,730			640			19,106
Net charge offs	(49,907		)	(217		)	115			(269		)	(2,529		)	(704		)	(2,213		)	(55,724		)
Provision for loan losses	57,051			(4,106		)	(2,366		)	(1,873		)	1,121			(897		)	2,070			51,000
September 30, 2016	$	137,103		$	14,357		$	40,767		$	23,124		$	26,853		$	21,954		$	5,382		$	269,540
Allowance for loan losses:
Individually evaluated for impairment	$	8,570		$	—		$	79		$	—		$	976		$	—		$	—		$	9,625
Collectively evaluated for impairment	128,533			14,357			40,688			23,124			25,877			21,954			5,382			259,915
Total allowance for loan losses	$	137,103		$	14,357		$	40,767		$	23,124		$	26,853		$	21,954		$	5,382		$	269,540
Loans:
Individually evaluated for impairment	$	203,834		$	5,719		$	7,023		$	—		$	9,389		$	650		$	—		$	226,615
Collectively evaluated for impairment	6,517,723			886,959			3,523,347			1,314,431			6,024,777			950,944			399,209			19,617,390
Total loans	$	6,721,557		$	892,678		$	3,530,370		$	1,314,431		$	6,034,166		$	951,594		$	399,209		$	19,844,005

Changes in the allowance for unfunded commitments

A summary of the changes in the allowance for unfunded commitments was as follows.

	Nine Months Ended September 30, 2016		Year Ended December 31, 2015
	($ in Thousands)
Allowance for Unfunded Commitments:
Balance at beginning of period	$	24,400	$	24,900
Provision for unfunded commitments	4,000		(500		)
Balance at end of period	$	28,400	$	24,400