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Loans and Allowances for Credit Losses (Tables)

12 Months Ended

Dec. 31, 2021

Dec. 31, 2020

Loans and Leases Receivable, Net Amount [Abstract]

Schedule of the Loans by Portfolio Segment [Table Text Block]

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


	December 31, 2021								December 31, 2020
	Fixed Rate		Variable Rate		Non-accrual		Total		Fixed Rate		Variable Rate		Non-accrual		Total
Commercial	$	3,360,117	$	9,072,244	$	74,104	$	12,506,465	$	3,174,203	$	9,736,173	$	167,159	$	13,077,535
Commercial real estate	929,015		2,888,048		14,262		3,831,325		1,047,486		3,623,806		27,246		4,698,538
Paycheck protection program	276,341		—		—		276,341		1,682,310		—		—		1,682,310
Loans to individuals	2,037,792		1,508,064		45,693		3,591,549		2,174,874		1,333,975		40,288		3,549,137
Total	$	6,603,265	$	13,468,356	$	134,059	$	20,205,680	$	8,078,873	$	14,693,954	$	234,693	$	23,007,520
Foregone interest on nonaccrual loans							$	14,102							$	22,870

Rollforward of Allowance For Loan Losses And Accrual for Off-Balnace 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 year ended December 31, 2021 is summarized as follows (in thousands):


	Commercial		Commercial Real Estate		Paycheck Protection Program		Loans to Individuals		Nonspecific Allowance		Total
Allowance for loan losses:


Beginning balance, adjusted	254,934		86,558		—		47,148		—		388,640
Provision for loan losses	(59,326)		(26,522)		—		(9,354)		—		(95,202)
Loans charged off	(43,956)		(2,485)		—		(4,910)		—		(51,351)
Recoveries of loans previously charged off	10,404		1,002		—		2,928		—		14,334
Ending balance	$	162,056	$	58,553	$	—	$	35,812	$	—	$	256,421

Allowance for off-balance sheet credit risk from unfunded loan commitments:


Beginning balance, adjusted	14,422		20,571		—		1,928		—		36,921
Provision for off-balance sheet credit risk	(610)		(3,129)		—		(205)		—		(3,944)
Ending balance	$	13,812	$	17,442	$	—	$	1,723	$	—	$	32,977

Changes in our reasonable and supportable forecasts of macroeconomic variables, primarily due to the anticipated impact of the on-going COVID-19 pandemic, and other assumptions, resulted in a $90.1 million decrease in the allowance for lending activities during the year ended December 31, 2021. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances and risk grading resulted in a $9.0 million decrease in the allowance for lending activities.


	Commercial		Commercial Real Estate		Paycheck Protection Program		Loans to Individuals		Nonspecific Allowance		Total
Allowance for loan losses:
Beginning balance	$	118,187	$	51,805	$	—	$	23,572	$	17,195	$	210,759
Transition adjustment	33,681		(4,620)		—		13,943		(17,195)		25,809
Beginning balance, adjusted	151,868		47,185		—		37,515		—		236,568
Provision for loan losses	171,800		40,407		—		10,253		—		222,460
Loans charged off	(73,370)		(1,300)		—		(4,729)		—		(79,399)
Recoveries of loans previously charged off	4,636		266		—		4,109		—		9,011
Ending balance	$	254,934	$	86,558	$	—	$	47,148	$	—	$	388,640

Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance	$	1,434	$	107	$	—	$	44	$	—	$	1,585
Transition adjustment	10,144		11,660		—		1,748		—		23,552
Beginning balance, adjusted	11,578		11,767		—		1,792		—		25,137
Provision for off-balance sheet credit risk	2,844		8,804		—		136		—		11,784
Ending balance	$	14,422	$	20,571	$	—	$	1,928	$	—	$	36,921

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2021 is as follows (in thousands):


	Collectively Measured for General Allowances				Individually Measured for Specific Allowances				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	12,432,361	$	158,063	$	74,104	$	3,993	$	12,506,465	$	162,056
Commercial real estate	3,817,063		56,204		14,262		2,349		3,831,325		58,553
Paycheck protection program	276,341		—		—		—		276,341		—
Loans to individuals	3,545,856		35,812		45,693		—		3,591,549		35,812
Total	$	20,071,621	$	250,079	$	134,059	$	6,342	$	20,205,680	$	256,421

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2020 is as follows (in thousands):


	Collectively Measured for General Allowances				Individually Measured for Specific Allowances				Total
	Recorded Investment		Related Allowance		Recorded Investment		Related Allowance		Recorded Investment		Related Allowance
Commercial	$	12,910,376	$	235,882	$	167,159	$	19,052	$	13,077,535	$	254,934
Commercial real estate	4,671,292		83,169		27,246		3,389		4,698,538		86,558
Paycheck protection program	1,682,310		—		—		—		1,682,310		—
Loans to individuals	3,508,849		47,148		40,288		—		3,549,137		47,148
Total	$	22,772,827	$	366,199	$	234,693	$	22,441	$	23,007,520	$	388,640

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 is for the year ended December 31, 2019 summarized as follows (in thousands):


	Commercial		Commercial Real Estate		Residential Mortgage		Personal		Nonspecific Allowance		Total
Allowance for loan losses:
Beginning balance	$	102,226	$	60,026	$	17,964	$	9,473	$	17,768	$	207,457
Provision for loan losses	57,125		(12,046)		(3,838)		3,537		(573)		44,205
Loans charged off	(43,185)		(1,161)		(288)		(6,343)		—		(50,977)
Recoveries	2,021		4,986		562		2,505		—		10,074
Ending balance	$	118,187	$	51,805	$	14,400	$	9,172	$	17,195	$	210,759
Allowance for off-balance sheet credit losses:
Beginning balance	1,655		52		52		31		—		1,790
Provision for off-balance sheet credit losses	(221)		55		(8)		(31)		—		(205)
Ending balance	$	1,434	$	107	$	44	$	—	$	—	$	1,585

Total provision for credit losses	$	56,904	$	(11,991)	$	(3,846)	$	3,506	$	(573)	$	44,000

Schedule of Credit Quality Indicators [Table Text Block]


	Origination Year
	2021		2020		2019		2018		2017		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Commercial:
Energy
Pass	$	252,133	$	29,556	$	15,914	$	13,548	$	4,741	$	6,765	$	2,540,525	$	—	$	2,863,182
Special Mention	558		771		—		—		—		—		750		—		2,079
Accruing Substandard	10,650		22,611		1,185		814		—		716		74,556		—		110,532
Nonaccrual	—		20,487		—		—		—		714		9,890		—		31,091
Total energy	263,341		73,425		17,099		14,362		4,741		8,195		2,625,721		—		3,006,884



Healthcare
Pass	563,800		589,193		516,558		498,998		319,096		688,136		160,154		26		3,335,961
Special Mention	6,835		—		15,583		—		11,135		—		5		—		33,558
Accruing Substandard	—		—		27,135		543		—		1,981		—		—		29,659
Nonaccrual	—		—		—		6,542		—		8,711		509		—		15,762
Total healthcare	570,635		589,193		559,276		506,083		330,231		698,828		160,668		26		3,414,940



Services
Pass	696,149		405,057		289,375		275,010		225,404		795,029		607,958		375		3,294,357
Special Mention	434		405		1,830		1,047		3,290		47		17,210		192		24,455
Accruing Substandard	43		530		4,166		10,714		1,785		2,366		11,607		—		31,211
Nonaccrual	—		—		—		230		13,918		2,519		503		—		17,170
Total services	696,626		405,992		295,371		287,001		244,397		799,961		637,278		567		3,367,193



General business
Pass	584,438		211,892		264,462		177,384		168,977		215,014		1,047,420		2,284		2,671,871
Special Mention	218		223		60		1,435		3,842		—		5,875		—		11,653
Accruing Substandard	265		1,066		1,634		7,697		8,336		3,024		1,821		—		23,843
Nonaccrual	—		2,444		4,562		1,046		762		518		730		19		10,081
Total general business	584,921		215,625		270,718		187,562		181,917		218,556		1,055,846		2,303		2,717,448



Total commercial	2,115,523		1,284,235		1,142,464		995,008		761,286		1,725,540		4,479,513		2,896		12,506,465

Commercial real estate:
Pass	717,400		711,231		871,283		403,115		279,058		664,684		117,847		31		3,764,649
Special Mention	—		—		—		6,660		10,898		9,244		—		—		26,802
Accruing Substandard	—		—		—		13,352		4,480		7,780		—		—		25,612
Nonaccrual	—		—		8,076		—		—		6,186		—		—		14,262
Total commercial real estate	717,400		711,231		879,359		423,127		294,436		687,894		117,847		31		3,831,325


	Origination Year
	2021		2020		2019		2018		2017		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Paycheck protection program:
Pass	237,357		38,984		—		—		—		—		—		—		276,341
Total paycheck protection program	237,357		38,984		—		—		—		—		—		—		276,341
Loans to individuals:
Residential mortgage
Pass	386,092		452,537		84,001		60,390		68,150		295,632		320,638		21,463		1,688,903
Special Mention	—		—		156		—		19		411		282		159		1,027
Accruing Substandard	98		—		—		—		127		41		400		—		666
Nonaccrual	1,516		1,809		383		1,968		629		22,289		2,177		803		31,574
Total residential mortgage	387,706		454,346		84,540		62,358		68,925		318,373		323,497		22,425		1,722,170



Residential mortgage guaranteed by U.S. government agencies
Pass	699		11,380		20,650		27,970		32,742		246,871		—		—		340,312


Nonaccrual	—		—		1,259		821		635		11,146		—		—		13,861
Total residential mortgage guaranteed by U.S. government agencies	699		11,380		21,909		28,791		33,377		258,017		—		—		354,173



Personal:
Pass	218,960		180,577		177,389		70,249		92,592		135,041		638,713		728		1,514,249
Special Mention	—		9		34		3		—		47		—		—		93
Accruing Substandard	435		5		165		—		—		1		—		—		606
Nonaccrual	110		14		10		24		35		40		25		—		258
Total personal	219,505		180,605		177,598		70,276		92,627		135,129		638,738		728		1,515,206



Total loans to individuals	607,910		646,331		284,047		161,425		194,929		711,519		962,235		23,153		3,591,549
Total loans	$	3,678,190	$	2,680,781	$	2,305,870	$	1,579,560	$	1,250,651	$	3,124,953	$	5,559,595	$	26,080	$	20,205,680

The following table summarizes the Company's loan portfolio at December 31, 2020 by the risk grade categories and vintage (in thousands):


	Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Commercial:
Energy
Pass	$	112,614	$	51,863	$	89,346	$	7,178	$	1,148	$	7,956	$	2,548,663	$	—	$	2,818,768
Special Mention	—		—		—		—		—		—		202,590		—		202,590
Accruing Substandard	24,000		1,363		1,453		—		12,667		—		283,294		—		322,777
Nonaccrual	21,076		2,607		—		—		—		21,064		80,312		—		125,059
Total energy	157,690		55,833		90,799		7,178		13,815		29,020		3,114,859		—		3,469,194



Healthcare
Pass	536,745		615,221		638,302		422,834		234,399		658,286		147,132		—		3,252,919
Special Mention	—		27,500		—		—		—		8,282		5		—		35,787
Accruing Substandard	—		—		1,191		929		132		11,387		—		—		13,639
Nonaccrual	—		18		183		—		—		2,935		509		—		3,645
Total healthcare	536,745		642,739		639,676		423,763		234,531		680,890		147,646		—		3,305,990



Services
Pass	534,853		436,384		372,867		307,374		373,785		683,936		665,491		682		3,375,372
Special Mention	150		9,057		389		291		2,038		2,000		3,063		—		16,988
Accruing Substandard	429		6,380		26,008		6,027		5,030		7,954		38,797		—		90,625
Nonaccrual	4,833		448		—		12,590		1,049		6,138		540		—		25,598
Total services	540,265		452,269		399,264		326,282		381,902		700,028		707,891		682		3,508,583



General business
Pass	419,756		394,985		310,273		236,222		103,987		186,600		1,055,878		2,316		2,710,017
Special Mention	197		4,519		9,713		7,803		2,511		3,159		2,483		19		30,404
Accruing Substandard	1,432		3,069		6,694		10,935		10,042		3,729		4,449		140		40,490
Nonaccrual	1,675		3,728		4,863		1,436		530		107		477		41		12,857
Total general business	423,060		406,301		331,543		256,396		117,070		193,595		1,063,287		2,516		2,793,768



Total commercial	1,657,760		1,557,142		1,461,282		1,013,619		747,318		1,603,533		5,033,683		3,198		13,077,535

Commercial real estate:
Pass	725,577		1,211,338		954,226		489,193		314,899		722,475		223,131		38		4,640,877
Special Mention	—		—		259		12,311		2,725		5,831		—		—		21,126
Accruing Substandard	—		—		—		4,410		—		4,852		27		—		9,289
Nonaccrual	—		8,300		—		232		7,468		11,246		—		—		27,246
Total commercial real estate	725,577		1,219,638		954,485		506,146		325,092		744,404		223,158		38		4,698,538


	Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Revolving Loans Converted to Term Loans		Total
Paycheck protection program:
Pass	1,682,310		—		—		—		—		—		—		—		1,682,310
Total paycheck protection program	1,682,310		—		—		—		—		—		—		—		1,682,310
Loans to individuals:
Residential mortgage
Pass	564,325		149,832		120,875		124,930		158,801		348,292		335,259		24,553		1,826,867
Special Mention	33		11		2,094		—		59		318		950		10		3,475
Accruing Substandard	—		—		51		—		—		34		272		76		433
Nonaccrual	648		104		1,658		784		2,010		22,415		3,835		774		32,228
Total residential mortgage	565,006		149,947		124,678		125,714		160,870		371,059		340,316		25,413		1,863,003



Residential mortgage guaranteed by U.S. government agencies
Pass	4,859		33,880		34,464		43,099		58,264		226,380		—		—		400,946


Nonaccrual	—		—		545		—		309		6,887		—		—		7,741
Total residential mortgage guaranteed by U.S. government agencies	4,859		33,880		35,009		43,099		58,573		233,267		—		—		408,687



Personal:
Pass	219,873		200,580		76,246		100,229		64,104		102,126		510,571		1,510		1,275,239
Special Mention	39		55		66		—		469		31		965		—		1,625
Accruing Substandard	11		214		10		—		—		—		29		—		264
Nonaccrual	28		17		57		73		50		49		45		—		319
Total personal	219,951		200,866		76,379		100,302		64,623		102,206		511,610		1,510		1,277,447



Total loans to individuals	789,816		384,693		236,066		269,115		284,066		706,532		851,926		26,923		3,549,137
Total loans	$	4,855,463	$	3,161,473	$	2,651,833	$	1,788,880	$	1,356,476	$	3,054,469	$	6,108,767	$	30,159	$	23,007,520

Financing Receivable, Nonaccrual [Table Text Block]

A summary of nonaccruing loans as of December 31, 2021 follows (in thousands):


	Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	31,091	$	31,091	$	—	$	—
Healthcare	15,762		9,679		6,083		53
Services	17,170		13,686		3,484		2,584
General business	10,081		7,690		2,391		1,357
Total commercial	74,104		62,146		11,958		3,994

Commercial real estate	14,262		6,186		8,076		2,349

Loans to individuals:
Residential mortgage	31,574		31,574		—		—
Residential mortgage guaranteed by U.S. government agencies	13,861		13,861		—		—
Personal	258		258		—		—
Total loans to individuals	45,693		45,693		—		—

Total	$	134,059	$	114,025	$	20,034	$	6,343

A summary of nonaccruing loans as of December 31, 2020 follows (in thousands):


	Total		With No Allowance		With Allowance		Related Allowance
Commercial:
Energy	$	125,059	$	76,633	$	48,426	$	16,478
Healthcare	3,645		3,645		—		—
Services	25,598		20,810		4,788		2,574
General business	12,857		12,857		—		—
Total commercial	167,159		113,945		53,214		19,052

Commercial real estate	27,246		13,645		13,601		3,389

Loans to individuals:
Residential mortgage	32,228		32,228		—		—
Residential mortgage guaranteed by U.S. government agencies	7,741		7,741		—		—
Personal	319		319		—		—
Total loans to individuals	40,288		40,288		—		—

Total	$	234,693	$	167,878	$	66,815	$	22,441

Summary of Loans by Aging Status [Table Text Block]

A summary of loans currently performing and past due as of December 31, 2021 is as follows (in thousands):


			Past Due
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Total		Past Due 90 Days or More and Accruing
Commercial:
Energy	$	3,002,623	$	545	3,716		$	—	$	3,006,884	$	—
Healthcare	3,412,072		2,359		—		509		3,414,940		—
Services	3,352,639		920		4,620		9,014		3,367,193		—
General business	2,705,596		6,080		997		4,775		2,717,448		199
Total commercial	12,472,930		9,904		9,333		14,298		12,506,465		199

Commercial real estate	3,827,962		—		206		3,157		3,831,325		—

Paycheck protection program	276,341		—		—		—		276,341		74

Loans to individuals
Permanent mortgage	1,707,654		6,263		1,556		6,697		1,722,170		—
Permanent mortgages guaranteed by U.S. government agencies	181,022		26,869		16,751		129,531		354,173		118,819
Personal	1,514,938		66		24		178		1,515,206		40
Total loans to individuals	3,403,614		33,198		18,331		136,406		3,591,549		118,859

Total	$	19,980,847	$	43,102	$	27,870	$	153,861	$	20,205,680	$	119,132

A summary of loans currently performing and past due as of December 31, 2020 is as follows (in thousands):


			Past Due
	Current		30 to 59 Days		60 to 89 Days		90 Days or More		Total		Past Due 90 Days or More and Accruing
Commercial:
Energy	$	3,410,995	$	12,735	4,050		$	41,414	$	3,469,194	$	—
Healthcare	3,302,345		—		—		3,645		3,305,990		—
Services	3,489,423		3,278		177		15,705		3,508,583		326
General business	2,776,038		1,206		6,277		10,247		2,793,768		4,495
Total commercial	12,978,801		17,219		10,504		71,011		13,077,535		4,821

Commercial real estate	4,672,279		276		5,310		20,673		4,698,538		5,126

Paycheck protection program	1,682,310		—		—		—		1,682,310		—

Loans to individuals
Permanent mortgage	1,849,304		5,812		837		7,050		1,863,003		181
Permanent mortgages guaranteed by U.S. government agencies	262,102		41,389		22,041		83,155		408,687		78,349
Personal	1,273,702		3,317		90		338		1,277,447		241
Total loans to individuals	3,385,108		50,518		22,968		90,543		3,549,137		78,771

Total	$	22,718,498	$	68,013	$	38,782	$	182,227	$	23,007,520	$	88,718