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Loans and Allowances for Credit Losses (Tables)

6 Months Ended

Jun. 30, 2021

Loans and Leases Receivable, Net Amount [Abstract]

Schedule of Loans by Portfolio Segment [Table Text Block]

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

						June 30, 2021																								December 31, 2020
						Fixed Rate						Variable Rate						Non-accrual						Total						Fixed Rate						Variable Rate						Non-accrual						Total
Commercial						$	3,277,687					$	9,082,616					$	112,604					$	12,472,907					$	3,174,203					$	9,736,173					$	167,159					$	13,077,535
Commercial real estate						1,028,432						3,192,437						26,123						4,246,992						1,047,486						3,623,806						27,246						4,698,538
Paycheck protection program						1,121,583						—						—						1,121,583						1,682,310						—						—						1,682,310
Loans to individuals						2,133,502						1,400,556						40,909						3,574,967						2,174,874						1,333,975						40,288						3,549,137
Total						$	7,561,204					$	13,675,609					$	179,636					$	21,416,449					$	8,078,873					$	14,693,954					$	234,693					$	23,007,520

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 is summarized as follows (in thousands):

						Three Months Ended
						June 30, 2021
						Commercial						Commercial Real Estate						Paycheck Protection Program						Loans to Individuals						Nonspecific Allowance						Total
Allowance for loan losses:
Beginning balance						$	231,372					$	81,746					$	—					$	39,284					$	—					$	352,402
Provision for loan losses						(18,442)						(10,582)						—						3,960						—						(25,064)
Loans charged off						(16,502)						(800)						—						(1,002)						—						(18,304)
Recoveries of loans previously charged off						1,875						176						—						805						—						2,856
Ending Balance						$	198,303					$	70,540					$	—					$	43,047					—						$	311,890
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance						$	12,736					$	18,298					$	—					$	1,843					$	—					$	32,877
Provision for off-balance sheet credit risk						(2,642)						(5,950)						—						2						—						(8,590)
Ending Balance						$	10,094					$	12,348					$	—					$	1,845					$	—					$	24,287

						Six Months Ended
						June 30, 2021
						Commercial						Commercial Real Estate						Paycheck Protection Program						Loans to Individuals						Nonspecific Allowance						Total
Allowance for loan losses:
Beginning balance						$	254,934					$	86,558					$	—					$	47,148					$	—					$	388,640
Provision for loan losses						(28,335)						(15,161)						—						(3,338)						—						(46,834)
Loans charged off						(31,847)						(1,063)						—						(2,299)						—						(35,209)
Recoveries						3,551						206						—						1,536						—						5,293
Ending balance						$	198,303					$	70,540					$	—					$	43,047					$	—					$	311,890
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance						$	14,422					$	20,571					$	—					$	1,928					$	—					$	36,921
Transition adjustment						—						—						—						—						—						—
Beginning balance, adjusted						14,422						20,571						—						1,928						—						36,921
Provision for off-balance sheet credit losses						(4,328)						(8,223)						—						(83)						—						(12,634)
Ending balance						$	10,094					$	12,348					$	—					$	1,845					$	—					$	24,287

						Three Months Ended
						June 30, 2020
						Commercial						Commercial Real Estate						Paycheck Protection Program						Loans to Individuals						Nonspecific Allowance						Total
Allowance for loan losses:
Beginning balance						$	213,438					$	51,461					$	—					$	50,412					$	—					$	315,311
Provision for loan losses						111,153						17,221						—						5,991						—						134,365
Loans charged off						(14,487)						(1)						—						(1,082)						—						(15,570)
Recoveries of loans previously charged off						318						75						—						1,098						—						1,491
Ending Balance						$	310,422					$	68,756					$	—					$	56,419					—						$	435,597
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance						$	14,040					$	12,575					$	—					$	1,899					$	—					$	28,514
Transition adjustment						—						—						—						—						—						—
Beginning balance, adjusted						14,040						12,575						—						1,899						—						28,514
Provision for off-balance sheet credit risk						542						3,844						—						19						—						4,405
Ending Balance						$	14,582					$	16,419					$	—					$	1,918					—						$	32,919

						Six Months Ended
						June 30, 2020
						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						188,876						22,336						—						19,117						—						230,329
Loans charged off						(31,102)						(887)						—						(2,498)						—						(34,487)
Recoveries of loans previously charged off						780						122						—						2,285						—						3,187
Ending Balance						$	310,422					$	68,756					$	—					$	56,419					—						$	435,597
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						3,004						4,652						—						126						—						7,782
Ending Balance						$	14,582					$	16,419					$	—					$	1,918					—						$	32,919

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 $34.2 million negative provision for credit losses related to lending activities during the second quarter of 2021. Changes in the loan portfolio characteristics, including specific impairment and losses, loan balances, risk grading and changes in payment profile resulted in a $579 thousand provision for credit losses related to lending activities.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at June 30, 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						$	12,360,303					$	188,227					$	112,604					$	10,076					$	12,472,907					$	198,303
Commercial real estate						4,220,869						66,841						26,123						3,699						4,246,992						70,540
Paycheck protection program						1,121,583						—						—						—						1,121,583						—
Loans to individuals						3,534,058						43,047						40,909						—						3,574,967						43,047
Total						$	21,236,813					$	298,115					$	179,636					$	13,775					$	21,416,449					$	311,890

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each 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

Schedule of Credit Quality Indicators [Table Text Block]

The following table summarizes the Company’s loan portfolio at June 30, 2021 by the risk grade categories and vintage (in thousands): 

			Origination Year
			2021			2020			2019			2018			2017			Prior			Revolving Loans			Revolving Loans Converted to Term Loans			Total
Commercial:
Energy
Pass			$	72,827		$	57,881		$	37,638		$	72,773		$	5,221		$	8,948		$	2,431,488		$	—		$	2,686,776
Special Mention			—			—			—			—			—			—			21,947			—			21,947
Accruing Substandard			—			24,000			1,275			1,219			—			10,843			194,930			—			232,267
Nonaccrual			—			20,911			2,404			—			—			11,238			35,788			—			70,341
Total energy			72,827			102,792			41,317			73,992			5,221			31,029			2,684,153			—			3,011,331
Healthcare
Pass			296,227			569,385			613,579			569,118			380,741			756,261			149,129			—			3,334,440
Special Mention			—			—			—			6,646			—			346			4			—			6,996
Accruing Substandard			—			—			27,444			871			—			10,983			—			—			39,298
Nonaccrual			—			—			18			—			—			—			509			—			527
Total healthcare			296,227			569,385			641,041			576,635			380,741			767,590			149,642			—			3,381,261
Services
Pass			334,227			521,732			363,415			322,526			271,369			921,002			537,942			550			3,272,763
Special Mention			222			126			1,752			90			3,279			11,247			1,370			—			18,086
Accruing Substandard			39			412			10,869			16,505			1,891			9,053			30,225			—			68,994
Nonaccrual			—			4,631			447			758			16,950			6,445			682			—			29,913
Total services			334,488			526,901			376,483			339,879			293,489			947,747			570,219			550			3,389,756
General business
Pass			318,504			313,185			332,890			221,590			197,124			267,409			975,933			2,081			2,628,716
Special Mention			818			259			2,719			134			4,010			1,026			7,275			—			16,241
Accruing Substandard			—			2,088			2,802			9,119			8,628			7,329			3,705			108			33,779
Nonaccrual			—			1,659			1,790			5,834			1,417			547			547			29			11,823
Total general business			319,322			317,191			340,201			236,677			211,179			276,311			987,460			2,218			2,690,559
Total commercial			1,022,864			1,516,269			1,399,042			1,227,183			890,630			2,022,677			4,391,474			2,768			12,472,907
Commercial real estate:
Pass			193,724			796,606			1,169,633			590,116			362,500			923,860			151,418			36			4,187,893
Special Mention			—			—			—			3,184			14,052			6,830			—			—			24,066
Accruing Substandard			—			—			—			—			4,467			4,416			27			—			8,910
Nonaccrual			—			—			8,300			—			—			17,823			—			—			26,123
Total commercial real estate			193,724			796,606			1,177,933			593,300			381,019			952,929			151,445			36			4,246,992

			Origination Year
			2021			2020			2019			2018			2017			Prior			Revolving Loans			Revolving Loans Converted to Term Loans			Total
Paycheck protection program:
Pass			660,775			460,808			—			—			—			—			—			—			1,121,583
Total paycheck protection program			660,775			460,808			—			—			—			—			—			—			1,121,583
Loans to individuals:
Residential mortgage
Pass			231,814			516,761			106,498			86,327			84,853			370,185			318,569			24,610			1,739,617
Special Mention			249			—			—			26			—			239			218			10			742
Accruing Substandard			—			—			117			—			—			121			545			12			795
Nonaccrual			—			627			241			1,049			675			25,754			2,213			914			31,473
Total residential mortgage			232,063			517,388			106,856			87,402			85,528			396,299			321,545			25,546			1,772,627
Residential mortgage guaranteed by U.S. government agencies
Pass			349			9,236			29,888			35,932			42,705			286,489			—			—			404,599
Nonaccrual			—			—			82			404			143			8,578			—			—			9,207
Total residential mortgage guaranteed by U.S. government agencies			349			9,236			29,970			36,336			42,848			295,067			—			—			413,806
Personal:
Pass			114,228			203,538			190,723			71,862			98,950			144,502			562,863			1,002			1,387,668
Special Mention			63			96			—			9			2			45			—			—			215
Accruing Substandard			—			—			175			20			—			227			—			—			422
Nonaccrual			—			1			31			42			53			76			26			—			229
Total personal			114,291			203,635			190,929			71,933			99,005			144,850			562,889			1,002			1,388,534
Total loans to individuals			346,703			730,259			327,755			195,671			227,381			836,216			884,434			26,548			3,574,967
Total loans			$	2,224,066		$	3,503,942		$	2,904,730		$	2,016,154		$	1,499,030		$	3,811,822		$	5,427,353		$	29,352		$	21,416,449

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 at June 30, 2021 follows (in thousands): 

			As of June 30, 2021
			Total						With No Allowance						With Allowance						Related Allowance
Commercial:
Energy			$	70,341					$	70,341					$	—					$	—
Healthcare			527						527						—						—
Services			29,913						21,484						8,429						5,234
General business			11,823						6,981						4,842						4,842
Total commercial			112,604						99,333						13,271						10,076
Commercial real estate			26,123						13,388						12,735						3,699
Loans to individuals:
Residential mortgage			31,473						31,473						—						—
Residential mortgage guaranteed by U.S. government agencies			9,207						9,207						—						—
Personal			229						229						—						—
Total loans to individuals			40,909						40,909						—						—
Total			$	179,636					$	153,630					$	26,006					$	13,775

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

			As of December 31, 2020
			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 June 30, 2021 is as follows (in thousands):

												Past Due																								Past Due 90 Days or More and Accruing
						Current						30 to 59 Days						60 to 89 Days						90 Days or More						Total
Commercial:
Energy						$	2,993,105					$	—					$	—					$	18,226					$	3,011,331					$	—
Healthcare						3,380,557						—						177						527						3,381,261						—
Services						3,377,109						336						—						12,311						3,389,756						212
General business						2,683,645						915						292						5,707						2,690,559						—
Total commercial						12,434,416						1,251						469						36,771						12,472,907						212
Commercial real estate						4,236,417						1,604						39						8,932						4,246,992						—
Paycheck protection program						1,121,583						—						—						—						1,121,583						—
Loans to individuals:
Residential mortgage						1,757,711						4,780						898						9,238						1,772,627						—
Residential mortgage guaranteed by U.S. government agencies						259,023						41,355						18,265						95,163						413,806						89,121
Personal						1,388,201						176						30						127						1,388,534						40
Total loans to individuals						3,404,935						46,311						19,193						104,528						3,574,967						89,161
Total						$	21,197,351					$	49,166					$	19,701					$	150,231					$	21,416,449					$	89,373

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

												Past Due																								Past Due 90 Days or More and Accruing
						Current						30 to 59 Days						60 to 89 Days						90 Days or More						Total
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:
Residential mortgage						1,849,304						5,812						837						7,050						1,863,003						181
Residential mortgage 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

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