Loans and Allowances for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2018

Loans Receivable, Net [Abstract]

Schedule of Loans by Portfolio Segment [Table Text Block]

Portfolio segments of the loan portfolio are as follows (in thousands):

	March 31, 2018								December 31, 2017
	Fixed Rate		Variable Rate		Non-accrual		Total		Fixed Rate		Variable Rate		Non-accrual		Total
Commercial	$	2,193,469	$	8,594,738	$	131,460	$	10,919,667	$	2,217,432	$	8,379,240	$	137,303	$	10,733,975
Commercial real estate	538,291		2,966,021		2,470		3,506,782		548,692		2,928,440		2,855		3,479,987
Residential mortgage	1,587,416		312,559		45,794		1,945,769		1,608,655		317,584		47,447		1,973,686
Personal	158,845		806,447		340		965,632		154,517		810,990		269		965,776
Total	$	4,478,021	$	12,679,765	$	180,064	$	17,337,850	$	4,529,296	$	12,436,254	$	187,874	$	17,153,424
Accruing loans past due (90 days)1							$	90							$	633

	March 31, 2017
	Fixed Rate		Variable Rate		Non-accrual		Total
Commercial	$	2,201,040	$	7,969,245	$	156,825	$	10,327,110
Commercial real estate	590,375		3,276,213		4,475		3,871,063
Residential mortgage	1,616,328		283,865		46,081		1,946,274
Personal	149,312		697,912		235		847,459
Total	$	4,557,055	$	12,227,235	$	207,616	$	16,991,906
Accruing loans past due (90 days)1							$	95

¹  Excludes residential mortgage loans guaranteed by agencies of the U.S. government

Rollforward of Allowance For Loan Losses And Accrual for Off-Balance Sheet Credit Losses [Table Text Block]

The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended March 31, 2018 is summarized as follows (in thousands):

	Commercial			Commercial Real Estate			Residential Mortgage			Personal			Nonspecific Allowance			Total
Allowance for loan losses:
Beginning balance	$	124,269		$	56,621		$	18,451		$	9,124		$	22,217		$	230,682
Provision for loan losses	(3,111		)	266			(162		)	(152		)	(2,242		)	(5,401		)
Loans charged off	(1,563		)	—			(100		)	(1,227		)	—			(2,890		)
Recoveries	488			183			242			663			—			1,576
Ending balance	$	120,083		$	57,070		$	18,431		$	8,408		$	19,975		$	223,967
Allowance for off-balance sheet credit losses:
Beginning balance	$	3,644		$	45		$	43		$	2		$	—		$	3,734
Provision for off-balance sheet credit losses	383			(1		)	19			—			—			401
Ending balance	$	4,027		$	44		$	62		$	2		$	—		$	4,135
Total provision for credit losses	$	(2,728	)	$	265		$	(143	)	$	(152	)	$	(2,242	)	$	(5,000	)

The activity in the allowance for loan losses and the allowance for off-balance sheet credit losses related to loan commitments and standby letters of credit for the three months ended March 31, 2017 is summarized as follows (in thousands):

	Commercial			Commercial Real Estate			Residential Mortgage			Personal			Nonspecific Allowance			Total
Allowance for loan losses:
Beginning balance	$	140,213		$	50,749		$	18,224		$	8,773		$	28,200		$	246,159
Provision for loan losses	(3,355		)	6,859			(39		)	(788		)	(873		)	1,804
Loans charged off	(424		)	—			(236		)	(1,493		)	—			(2,153		)
Recoveries	1,182			735			228			755			—			2,900
Ending balance	$	137,616		$	58,343		$	18,177		$	7,247		$	27,327		$	248,710
Allowance for off-balance sheet credit losses:
Beginning balance	$	11,063		$	123		$	50		$	8		$	—		$	11,244
Provision for off-balance sheet credit losses	(1,775		)	(17		)	(10		)	(2		)	—			(1,804		)
Ending balance	$	9,288		$	106		$	40		$	6		$	—		$	9,440
Total provision for credit losses	$	(5,130	)	$	6,842		$	(49	)	$	(790	)	$	(873	)	$	—

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at March 31, 2018 is as follows (in thousands):

	Collectively Measured for Impairment				Individually Measured for Impairment				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	10,788,207	$	106,721	$	131,460	$	13,362	$	10,919,667	$	120,083
Commercial real estate	3,504,312		57,070		2,470		—		3,506,782		57,070
Residential mortgage	1,899,975		18,431		45,794		—		1,945,769		18,431
Personal	965,292		8,408		340		—		965,632		8,408
Total	17,157,786		190,630		180,064		13,362		17,337,850		203,992
Nonspecific allowance	—		—		—		—		—		19,975
Total	$	17,157,786	$	190,630	$	180,064	$	13,362	$	17,337,850	$	223,967

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2017 is as follows (in thousands):

	Collectively Measured for Impairment				Individually Measured for Impairment				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	10,596,672	$	115,438	$	137,303	$	8,831	$	10,733,975	$	124,269
Commercial real estate	3,477,132		56,621		2,855		—		3,479,987		56,621
Residential mortgage	1,926,239		18,451		47,447		—		1,973,686		18,451
Personal	965,507		9,124		269		—		965,776		9,124
Total	16,965,550		199,634		187,874		8,831		17,153,424		208,465
Nonspecific allowance	—		—		—		—		—		22,217
Total	$	16,965,550	$	199,634	$	187,874	$	8,831	$	17,153,424	$	230,682

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at March 31, 2017 is as follows (in thousands):

	Collectively Measured for Impairment				Individually Measured for Impairment				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	10,170,285	$	134,164	$	156,825	$	3,452	$	10,327,110	$	137,616
Commercial real estate	3,866,588		58,343		4,475		—		3,871,063		58,343
Residential mortgage	1,900,193		18,132		46,081		45		1,946,274		18,177
Personal	847,224		7,247		235		—		847,459		7,247
Total	16,784,290		217,886		207,616		3,497		16,991,906		221,383
Nonspecific allowance	—		—		—		—		—		27,327
Total	$	16,784,290	$	217,886	$	207,616	$	3,497	$	16,991,906	$	248,710

Schedule of Allowance for Loan Losses and Recorded Investment by Portfolio Segment for Risk Graded and Non-Risk Graded Loans [Table Text Block]

The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at March 31, 2018 is as follows (in thousands):

	Internally Risk Graded				Non-Graded				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	10,894,979	$	119,202	$	24,688	$	881	$	10,919,667	$	120,083
Commercial real estate	3,506,782		57,070		—		—		3,506,782		57,070
Residential mortgage	229,996		2,949		1,715,773		15,482		1,945,769		18,431
Personal	880,694		6,570		84,938		1,838		965,632		8,408
Total	15,512,451		185,791		1,825,399		18,201		17,337,850		203,992
Nonspecific allowance	—		—		—		—		—		19,975
Total	$	15,512,451	$	185,791	$	1,825,399	$	18,201	$	17,337,850	$	223,967

The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at December 31, 2017 is as follows (in thousands):

	Internally Risk Graded				Non-Graded				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	10,706,035	$	123,383	$	27,940	$	886	$	10,733,975	$	124,269
Commercial real estate	3,479,987		56,621		—		—		3,479,987		56,621
Residential mortgage	234,477		2,947		1,739,209		15,504		1,973,686		18,451
Personal	877,390		6,461		88,386		2,663		965,776		9,124
Total	15,297,889		189,412		1,855,535		19,053		17,153,424		208,465
Nonspecific allowance	—		—		—		—		—		22,217
Total	$	15,297,889	$	189,412	$	1,855,535	$	19,053	$	17,153,424	$	230,682

The allowance for loan losses and recorded investment of the related loans by portfolio segment for risk graded and non-risk graded loans at March 31, 2017 is as follows (in thousands):

	Internally Risk Graded				Non-Graded				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	10,302,774	$	136,672	$	24,336	$	944	$	10,327,110	$	137,616
Commercial real estate	3,871,063		58,343		—		—		3,871,063		58,343
Residential mortgage	211,846		2,958		1,734,428		15,219		1,946,274		18,177
Personal	749,028		5,136		98,431		2,111		847,459		7,247
Total	15,134,711		203,109		1,857,195		18,274		16,991,906		221,383
Nonspecific allowance	—		—		—		—		—		27,327
Total	$	15,134,711	$	203,109	$	1,857,195	$	18,274	$	16,991,906	$	248,710

Schedule of Credit Quality Indicators [Table Text Block]

The following table summarizes the Company’s loan portfolio at March 31, 2018 by the risk grade categories (in thousands): 

	Internally Risk Graded								Non-Graded
	Performing
	Pass		Other Loans Especially Mentioned		Accruing Substandard		Nonaccrual		Performing		Nonaccrual		Total
Commercial:
Energy	$	2,745,169	$	10,750	$	123,757	$	89,942	$	—	$	—	$	2,969,618
Services	2,872,017		23,155		31,013		2,109		—		—		2,928,294
Wholesale/retail	1,507,322		2,705		18,985		2,564		—		—		1,531,576
Manufacturing	540,580		9,047		7,066		3,002		—		—		559,695
Healthcare	2,316,962		—		27,624		15,342		—		—		2,359,928
Other commercial and industrial	516,970		—		10,421		18,477		24,664		24		570,556
Total commercial	10,499,020		45,657		218,866		131,436		24,664		24		10,919,667
Commercial real estate:
Residential construction and land development	113,894		1,828		123		1,613		—		—		117,458
Retail	728,045		21,993		94		264		—		—		750,396
Office	729,824		7,045		—		275		—		—		737,144
Multifamily	1,008,863		—		40		—		—		—		1,008,903
Industrial	613,608		—		—		—		—		—		613,608
Other commercial real estate	278,955		—		—		318		—		—		279,273
Total commercial real estate	3,473,189		30,866		257		2,470		—		—		3,506,782
Residential mortgage:
Permanent mortgage	224,232		1,499		3,147		1,118		794,329		23,460		1,047,785
Permanent mortgages guaranteed by U.S. government agencies	—		—		—		—		168,997		8,883		177,880
Home equity	—		—		—		—		707,771		12,333		720,104
Total residential mortgage	224,232		1,499		3,147		1,118		1,671,097		44,676		1,945,769
Personal	880,509		48		55		82		84,680		258		965,632
Total	$	15,076,950	$	78,070	$	222,325	$	135,106	$	1,780,441	$	44,958	$	17,337,850

The following table summarizes the Company’s loan portfolio at December 31, 2017 by the risk grade categories (in thousands): 

	Internally Risk Graded								Non-Graded
	Performing
	Pass		Other Loans Especially Mentioned		Accruing Substandard		Nonaccrual		Performing		Nonaccrual		Total
Commercial:
Energy	$	2,632,986	$	60,288	$	144,598	$	92,284	$	—	$	—	$	2,930,156
Services	2,943,869		13,927		26,533		2,620		—		—		2,986,949
Wholesale/retail	1,443,917		19,263		5,502		2,574		—		—		1,471,256
Manufacturing	472,869		6,653		11,290		5,962		—		—		496,774
Healthcare	2,253,497		3,186		43,305		14,765		—		—		2,314,753
Other commercial and industrial	478,951		7		8,161		19,028		27,870		70		534,087
Total commercial	10,226,089		103,324		239,389		137,233		27,870		70		10,733,975
Commercial real estate:
Residential construction and land development	113,190		1,828		395		1,832		—		—		117,245
Retail	686,915		4,243		98		276		—		—		691,532
Office	824,408		7,087		—		275		—		—		831,770
Multifamily	979,969		—		48		—		—		—		980,017
Industrial	573,014		—		—		—		—		—		573,014
Other commercial real estate	285,506		145		286		472		—		—		286,409
Total commercial real estate	3,463,002		13,303		827		2,855		—		—		3,479,987
Residential mortgage:
Permanent mortgage	232,492		—		822		1,163		784,928		24,030		1,043,435
Permanent mortgages guaranteed by U.S. government agencies	—		—		—		—		188,327		9,179		197,506
Home equity	—		—		—		—		719,670		13,075		732,745
Total residential mortgage	232,492		—		822		1,163		1,692,925		46,284		1,973,686
Personal	875,696		1,548		63		83		88,200		186		965,776
Total	$	14,797,279	$	118,175	$	241,101	$	141,334	$	1,808,995	$	46,540	$	17,153,424

The following table summarizes the Company’s loan portfolio at March 31, 2017 by the risk grade categories (in thousands): 

	Internally Risk Graded								Non-Graded
	Performing
	Pass		Other Loans Especially Mentioned		Accruing Substandard		Nonaccrual		Performing		Nonaccrual		Total
Commercial:
Energy	$	1,988,392	$	144,157	$	294,138	$	110,425	$	—	$	—	$	2,537,112
Services	2,960,912		13,931		30,819		7,713		—		—		3,013,375
Wholesale/retail	1,459,703		21,970		13,480		11,090		—		—		1,506,243
Manufacturing	504,824		1,917		30,782		5,907		—		—		543,430
Healthcare	2,196,517		35,704		32,474		909		—		—		2,265,604
Other commercial and industrial	407,317		4,641		4,315		20,737		24,292		44		461,346
Total commercial	9,517,665		222,320		406,008		156,781		24,292		44		10,327,110
Commercial real estate:
Residential construction and land development	132,127		—		1,251		2,616		—		—		135,994
Retail	738,978		5,754		—		314		—		—		745,046
Office	857,582		2,894		—		413		—		—		860,889
Multifamily	918,542		—		4,425		24		—		—		922,991
Industrial	871,387		—		—		76		—		—		871,463
Other commercial real estate	333,554		—		94		1,032		—		—		334,680
Total commercial real estate	3,852,170		8,648		5,770		4,475		—		—		3,871,063
Residential mortgage:
Permanent mortgage	207,886		1,710		490		1,760		743,469		22,428		977,743
Permanent mortgages guaranteed by U.S. government agencies	—		—		—		—		194,073		10,108		204,181
Home equity	—		—		—		—		752,565		11,785		764,350
Total residential mortgage	207,886		1,710		490		1,760		1,690,107		44,321		1,946,274
Personal	748,000		49		888		91		98,287		144		847,459
Total	$	14,325,721	$	232,727	$	413,156	$	163,107	$	1,812,686	$	44,509	$	16,991,906

Summary of Impaired Loans [Table Text Block]

Impaired Loans

Loans are considered to be impaired when it is probable that the Company will not be able to collect all amounts due according to the contractual terms of the loan agreement. This includes all nonaccruing loans, all loans modified in a TDR and all loans repurchased from GNMA pools.

A summary of impaired loans follows (in thousands):

	As of										For the
	March 31, 2018										Three Months Ended
			Recorded Investment								March 31, 2018
	Unpaid Principal Balance		Total		With No Allowance		With Allowance		Related Allowance		Average Recorded Investment		Interest Income Recognized
Commercial:
Energy	$	111,002	$	89,942	$	22,816	$	67,126	$	12,701	$	91,113	$	—
Services	4,865		2,109		2,109		—		—		2,365		—
Wholesale/retail	9,089		2,564		2,564		—		—		2,569		—
Manufacturing	3,111		3,002		2,741		261		261		4,482		—
Healthcare	26,019		15,342		9,107		6,235		400		15,053		—
Other commercial and industrial	27,421		18,501		18,501		—		—		18,799		—
Total commercial	181,507		131,460		57,838		73,622		13,362		134,381		—
Commercial real estate:
Residential construction and land development	3,059		1,613		1,613		—		—		1,723		—
Retail	498		264		264		—		—		270		—
Office	287		275		275		—		—		275		—
Multifamily	—		—		—		—		—		—		—
Industrial	—		—		—		—		—		—		—
Other commercial real estate	522		318		318		—		—		395		—
Total commercial real estate	4,366		2,470		2,470		—		—		2,663		—
Residential mortgage:
Permanent mortgage	29,686		24,578		24,578		—		—		24,885		306
Permanent mortgage guaranteed by U.S. government agencies1	183,476		177,880		177,880		—		—		199,380		1,848
Home equity	13,898		12,333		12,333		—		—		12,704		—
Total residential mortgage	227,060		214,791		214,791		—		—		236,969		2,154
Personal	381		340		340		—		—		304		—
Total	$	413,314	$	349,061	$	275,439	$	73,622	$	13,362	$	374,317	$	2,154

¹  All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At March 31, 2018, $8.9 million of these loans were nonaccruing and $169 million were accruing based on the guarantee by U.S. government agencies.

Generally, no interest income is recognized on impaired loans until all principal balances, including amounts charged-off, are recovered.

A summary of impaired loans at December 31, 2017 follows (in thousands): 

			Recorded Investment
	Unpaid Principal Balance		Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	111,011	$	92,284	$	40,968	$	51,316	$	8,814
Services	5,324		2,620		2,620		—		—
Wholesale/retail	9,099		2,574		2,574		—		—
Manufacturing	6,073		5,962		5,962		—		—
Healthcare	25,140		14,765		14,765		—		—
Other commercial and industrial	27,957		19,098		19,080		18		17
Total commercial	184,604		137,303		85,969		51,334		8,831
Commercial real estate:
Residential construction and land development	3,285		1,832		1,832		—		—
Retail	509		276		276		—		—
Office	287		275		275		—		—
Multifamily	—		—		—		—		—
Industrial	—		—		—		—		—
Other commercial real estate	670		472		472		—		—
Total commercial real estate	4,751		2,855		2,855		—		—
Residential mortgage:
Permanent mortgage	30,435		25,193		25,193		—		—
Permanent mortgage guaranteed by U.S. government agencies1	203,814		197,506		197,506		—		—
Home equity	14,548		13,075		13,075		—		—
Total residential mortgage	248,797		235,774		235,774		—		—
Personal	307		269		269		—		—
Total	$	438,459	$	376,201	$	324,867	$	51,334	$	8,831

¹  All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At December 31, 2017, $9 million of these loans were nonaccruing and $188 million were accruing based on the guarantee by U.S. government agencies.

A summary of impaired loans at March 31, 2017 follows (in thousands): 

											For the
	As of March 31, 2017										Three Months Ended
			Recorded Investment								March 31, 2017
	Unpaid Principal Balance		Total		With No Allowance		With Allowance		Related Allowance		Average Recorded Investment		Interest Income Recognized
Commercial:
Energy	$	125,579	$	110,425	$	58,324	$	52,101	$	3,435	$	121,462	$	—
Services	11,542		7,713		7,713		—		—		7,943		—
Wholesale/retail	17,582		11,090		11,090		—		—		11,248		—
Manufacturing	6,377		5,907		5,907		—		—		5,419		—
Healthcare	1,379		909		909		—		—		867		—
Other commercial and industrial	28,876		20,781		20,764		17		17		20,950		—
Total commercial	191,335		156,825		104,707		52,118		3,452		167,889		—
Commercial real estate:
Residential construction and land development	4,126		2,616		2,616		—		—		3,024		—
Retail	523		314		314		—		—		320		—
Office	515		413		413		—		—		420		—
Multifamily	1,000		24		24		—		—		31		—
Industrial	76		76		76		—		—		76		—
Other commercial real estate	1,213		1,032		1,032		—		—		1,127		—
Total commercial real estate	7,453		4,475		4,475		—		—		4,998		—
Residential mortgage:
Permanent mortgage	29,355		24,188		24,143		45		45		23,521		291
Permanent mortgage guaranteed by U.S. government agencies1	210,237		204,181		204,181		—		—		207,396		1,904
Home equity	13,008		11,785		11,785		—		—		11,652		—
Total residential mortgage	252,600		240,154		240,109		45		45		242,569		2,195
Personal	265		235		235		—		—		262		—
Total	$	451,653	$	401,689	$	349,526	$	52,163	$	3,497	$	415,718	$	2,195

¹  All permanent mortgage loans guaranteed by U.S. government agencies are considered impaired as we do not expect full collection of contractual principal and interest. At March 31, 2017, $10 million of these loans were nonaccruing and $194 million were accruing based on the guarantee by U.S. government agencies.

Summary of Loans by Aging Status [Table Text Block]

Nonaccrual & Past Due Loans

Past due status for all loan classes is based on the actual number of days since the last payment was due according to the contractual terms of the loans.

A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of March 31, 2018 is as follows (in thousands):

			Past Due
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Nonaccrual		Total
Commercial:
Energy	$	2,870,711	$	265	$	8,700	$	—	$	89,942	$	2,969,618
Services	2,922,639		3,487		59		—		2,109		2,928,294
Wholesale/retail	1,528,343		234		435		—		2,564		1,531,576
Manufacturing	556,693		—		—		—		3,002		559,695
Healthcare	2,344,134		113		339		—		15,342		2,359,928
Other commercial and industrial	551,989		40		20		6		18,501		570,556
Total commercial	10,774,509		4,139		9,553		6		131,460		10,919,667
Commercial real estate:
Residential construction and land development	115,845		—		—		—		1,613		117,458
Retail	750,132		—		—		—		264		750,396
Office	736,869		—		—		—		275		737,144
Multifamily	1,008,903		—		—		—		—		1,008,903
Industrial	613,608		—		—		—		—		613,608
Other commercial real estate	278,955		—		—		—		318		279,273
Total commercial real estate	3,504,312		—		—		—		2,470		3,506,782
Residential mortgage:
Permanent mortgage	1,020,885		2,322		—		—		24,578		1,047,785
Permanent mortgages guaranteed by U.S. government agencies	36,272		26,137		—		106,588		8,883		177,880
Home equity	705,986		1,377		386		22		12,333		720,104
Total residential mortgage	1,763,143		29,836		386		106,610		45,794		1,945,769
Personal	964,422		794		14		62		340		965,632
Total	$	17,006,386	$	34,769	$	9,953	$	106,678	$	180,064	$	17,337,850

A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2017 is as follows (in thousands):

			Past Due
	Current		30 to 59 Days		60 to 89 Days	90 Days or More		Nonaccrual		Total
Commercial:
Energy	$	2,833,668	$	—	4,204	$	—	$	92,284	$	2,930,156
Services	2,983,222		514		486	107		2,620		2,986,949
Wholesale/retail	1,468,284		398		—	—		2,574		1,471,256
Manufacturing	490,739		—		73	—		5,962		496,774
Healthcare	2,284,770		15,218		—	—		14,765		2,314,753
Other commercial and industrial	514,701		85		78	125		19,098		534,087
Total commercial	10,575,384		16,215		4,841	232		137,303		10,733,975
Commercial real estate:
Residential construction and land development	115,213		200		—	—		1,832		117,245
Retail	691,256		—		—	—		276		691,532
Office	831,118		254		—	123		275		831,770
Multifamily	979,625		22		370	—		—		980,017
Industrial	573,014		—		—	—		—		573,014
Other commercial real estate	285,937		—		—	—		472		286,409
Total commercial real estate	3,476,163		476		370	123		2,855		3,479,987
Residential mortgage:
Permanent mortgage	1,014,588		3,435		219	—		25,193		1,043,435
Permanent mortgages guaranteed by U.S. government agencies	22,692		18,978		13,468	133,189		9,179		197,506
Home equity	717,007		2,206		440	17		13,075		732,745
Total residential mortgage	1,754,287		24,619		14,127	133,206		47,447		1,973,686
Personal	964,374		681		191	261		269		965,776
Total	$	16,770,208	$	41,991	19,529	$	133,822	$	187,874	$	17,153,424

A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of March 31, 2017 is as follows (in thousands):

			Past Due
	Current		30 to 59 Days		60 to 89 Days	90 Days or More		Nonaccrual		Total
Commercial:
Energy	$	2,426,100	$	437	150	$	—	$	110,425	$	2,537,112
Services	3,002,984		2,395		234	49		7,713		3,013,375
Wholesale/retail	1,495,023		130		—	—		11,090		1,506,243
Manufacturing	537,168		115		240	—		5,907		543,430
Healthcare	2,264,266		—		429	—		909		2,265,604
Other commercial and industrial	440,484		—		81	—		20,781		461,346
Total commercial	10,166,025		3,077		1,134	49		156,825		10,327,110
Commercial real estate:
Residential construction and land development	133,064		314		—	—		2,616		135,994
Retail	744,732		—		—	—		314		745,046
Office	860,476		—		—	—		413		860,889
Multifamily	922,952		15		—	—		24		922,991
Industrial	871,362		25		—	—		76		871,463
Other commercial real estate	333,648		—		—	—		1,032		334,680
Total commercial real estate	3,866,234		354		—	—		4,475		3,871,063
Residential mortgage:
Permanent mortgage	948,191		5,364		—	—		24,188		977,743
Permanent mortgages guaranteed by U.S. government agencies	45,643		29,853		—	118,577		10,108		204,181
Home equity	750,914		1,376		266	9		11,785		764,350
Total residential mortgage	1,744,748		36,593		266	118,586		46,081		1,946,274
Personal	846,652		430		105	37		235		847,459
Total	$	16,623,659	$	40,454	1,505	$	118,672	$	207,616	$	16,991,906