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Loans and Allowances for Credit Losses (Tables)

12 Months Ended

Dec. 31, 2020

Dec. 31, 2019

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, 2020
						Fixed Rate						Variable Rate						Non-accrual						Total
Commercial						$	1,805,286					$	11,105,090					$	167,159					$	13,077,535
Commercial real estate						1,021,443						3,649,849						27,246						4,698,538
Paycheck protection program						1,682,310						—						—						1,682,310
Loans to individuals						2,173,437						1,335,412						40,288						3,549,137
Total						$	6,682,476					$	16,090,351					$	234,693					$	23,007,520
Foregone interest on nonaccrual loans																								$	22,870

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

						December 31, 2019
						Fixed Rate						Variable Rate						Non-accrual						Total
Commercial						$	3,231,485					$	10,684,749					$	115,416					$	14,031,650
Commercial real estate						1,056,321						3,349,836						27,626						4,433,783
Residential mortgage						1,652,653						393,897						37,622						2,084,172
Personal						193,903						1,007,192						287						1,201,382
Total						$	6,134,362					$	15,435,674					$	180,951					$	21,750,987
Accruing loans past due (90 days)1																								$	7,680
Foregone interest on nonaccrual loans																								$	17,409

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

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 is for the year ended December 31, 2020 summarized as follows (in thousands):

						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

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 $99.1 million increase in the allowance for lending activities during the year ended December 31, 2020. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances and risk grading resulted in a $135.2 million increase in the allowance for lending activities.

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

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, 2018 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						12,521						(147)						(1,156)						3,175						(4,449)						9,944
Loans charged off						(37,880)						—						(378)						(5,325)						—						(43,583)
Recoveries						3,316						3,552						1,047						2,499						—						10,414
Ending balance						$	102,226					$	60,026					$	17,964					$	9,473					$	17,768					$	207,457
Allowance for off-balance sheet credit losses:
Beginning balance						3,644						45						43						2						—						3,734
Provision for off-balance sheet credit losses						(1,989)						7						9						29						—						(1,944)
Ending balance						$	1,655					$	52					$	52					$	31					$	—					$	1,790
Total provision for credit losses						$	10,532					$	(140)					$	(1,147)					$	3,204					$	(4,449)					$	8,000

Schedule of Credit Quality Indicators [Table Text Block]

			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
Special Mention			—			—			—			—			—			—			—			—			—
Accruing Substandard			—			—			—			—			—			—			—			—			—
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

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each impairment measurement method at December 31, 2019 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						$	13,916,234					$	100,773					$	115,416					$	17,414					$	14,031,650					$	118,187
Commercial real estate						4,406,157						51,805						27,626						—						4,433,783						51,805
Residential mortgage						2,046,550						14,400						37,622						—						2,084,172						14,400
Personal						1,201,095						9,172						287						—						1,201,382						9,172
Total						21,570,036						176,150						180,951						17,414						21,750,987						193,564
Nonspecific allowance						—						—						—						—						—						17,195
Total						$	21,570,036					$	176,150					$	180,951					$	17,414					$	21,750,987					$	210,759

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, 2019 is as follows (in thousands):

						Internally Risk Graded												Non-Graded												Total
						Recorded Investment						Related Allowance						Recorded Investment						Related Allowance						Recorded Investment						Related Allowance
Commercial						$	13,997,538					$	117,236					$	34,112					$	951					$	14,031,650					$	118,187
Commercial real estate						4,433,783						51,805						—						—						4,433,783						51,805
Residential mortgage						279,113						3,085						1,805,059						11,315						2,084,172						14,400
Personal						1,116,297						7,003						85,085						2,169						1,201,382						9,172
Total						19,826,731						179,129						1,924,256						14,435						21,750,987						193,564
Nonspecific allowance						—						—						—						—						—						17,195
Total						$	19,826,731					$	179,129					$	1,924,256					$	14,435					$	21,750,987					$	210,759

The following table summarizes the Company's loan portfolio at December 31, 2019 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						$	3,700,406					$	117,298					$	63,951					$	91,722					$	—					$	—					$	3,973,377
Services						3,050,946						29,943						33,791						7,483						—						—						3,122,163
Wholesale/retail						1,749,023						5,281						5,399						1,163						—						—						1,760,866
Manufacturing						623,219						18,214						13,883						10,133						—						—						665,449
Healthcare						2,995,514						13,117						20,805						4,480						—						—						3,033,916
Public finance						709,868						—						—						—						—						—						709,868
Other commercial and industrial						709,729						4,028						17,744						398						34,075						37						766,011
Total commercial						13,538,705						187,881						155,573						115,379						34,075						37						14,031,650
Commercial real estate:
Residential construction and land development						150,529						—						—						350						—						—						150,879
Retail						743,343						12,067						1,243						18,868						—						—						775,521
Office						923,202						5,177						—						—						—						—						928,379
Multifamily						1,257,005						1,604						95						6,858						—						—						1,265,562
Industrial						852,539						1,658						1,011						909						—						—						856,117
Other commercial real estate						455,045						1,639						—						641						—						—						457,325
Total commercial real estate						4,381,663						22,145						2,349						27,626						—						—						4,433,783
Residential mortgage:
Permanent mortgage						276,138						78						2,404						493						758,260						19,948						1,057,321
Permanent mortgage guaranteed by U.S. government agencies						—						—						—						—						191,694						6,100						197,794
Home equity						—						—						—						—						817,976						11,081						829,057
Total residential mortgage						276,138						78						2,404						493						1,767,930						37,129						2,084,172
Personal						1,116,196						45						—						56						84,853						232						1,201,382
Total						$	19,312,702					$	210,149					$	160,326					$	143,554					$	1,886,858					$	37,398					$	21,750,987

Summary of Impaired Loans [Table Text Block]

A summary of impaired loans at December 31, 2019 follows (in thousand):

						As of December 31, 2019																														Year Ended
												Recorded Investment																								December 31, 2019
						Unpaid Principal Balance						Total						With No Allowance						With Allowance						Related Allowance						Average Recorded Investment						Interest Income Recognized
Commercial:
Energy						$	149,441					$	91,722					$	44,244					$	47,478					$	16,854					$	69,119					$	—
Services						10,923						7,483						6,301						1,182						240						5,854						—
Wholesale/retail						1,980						1,163						902						261						101						916						—
Manufacturing						10,848						10,133						9,914						219						219						9,144						—
Healthcare						13,774						4,480						4,480						—						—						7,798						—
Public finance						—						—						—						—						—						—						—
Other commercial and industrial						8,227						435						435						—						—						8,568						—
Total commercial						195,193						115,416						66,276						49,140						17,414						101,399						—
Commercial real estate:
Residential construction and land development						1,306						350						350						—						—						350						—
Retail						20,265						18,868						18,868						—						—						19,573						—
Office						—						—						—						—						—						—						—
Multifamily						6,858						6,858						6,858						—						—						3,580						—
Industrial						909						909						909						—						—						454						—
Other commercial real estate						801						641						641						—						—						666						—
Total commercial real estate						30,139						27,626						27,626						—						—						24,623						—
Residential mortgage:
Permanent mortgage						24,868						20,441						20,441						—						—						22,196						1,198
Permanent mortgage guaranteed by U.S. government agencies1						204,187						197,794						197,794						—						—						195,009						7,733
Home equity						12,967						11,081						11,081						—						—						10,776						—
Total residential mortgage						242,022						229,316						229,316						—						—						227,981						8,931
Personal						360						287						287						—						—						259						—
Total						$	467,714					$	372,645					$	323,505					$	49,140					$	17,414					$	354,262					$	8,931

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, 2019, the majority were accruing based on the guarantee by U.S. government agencies.

Summary of Loans by Aging Status [Table Text Block]

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

A summary of loans currently performing, loans past due and accruing and nonaccrual loans as of December 31, 2019 is as follows (in thousands):

												Past Due
						Current						30 to 59 Days						60 to 89 Days						90 Days or More						Nonaccrual						Total
Commercial:
Energy						$	3,881,244					$	401					10						$	—					$	91,722					$	3,973,377
Services						3,105,621						1,737						523						6,799						7,483						3,122,163
Wholesale/retail						1,758,878						712						113						—						1,163						1,760,866
Manufacturing						654,329						410						190						387						10,133						665,449
Healthcare						3,027,329						2,039						—						68						4,480						3,033,916
Public finance						707,638						2,230						—						—						—						709,868
Other commercial and industrial						764,390						414						772						—						435						766,011
Total commercial						13,899,429						7,943						1,608						7,254						115,416						14,031,650
Commercial real estate:
Residential construction and land development						147,379						3,093						—						57						350						150,879
Retail						756,653						—						—						—						18,868						775,521
Office						928,379						—						—						—						—						928,379
Multifamily						1,258,704						—						—						—						6,858						1,265,562
Industrial						855,208						—						—						—						909						856,117
Other commercial real estate						454,253						1,827						250						354						641						457,325
Total commercial real estate						4,400,576						4,920						250						411						27,626						4,433,783
Residential mortgage:
Permanent mortgage						1,034,716						2,011						153						—						20,441						1,057,321
Permanent mortgages guaranteed by U.S. government agencies						46,898						24,203						18,187						102,406						6,100						197,794
Home equity						814,325						3,343						308						—						11,081						829,057
Total residential mortgage						1,895,939						29,557						18,648						102,406						37,622						2,084,172
Personal						1,196,362						4,664						54						15						287						1,201,382
Total						$	21,392,306					$	47,084					20,560						$	110,086					$	180,951					$	21,750,987

Financing Receivable, Nonaccrual [Table Text Block]

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

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