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Loans and Allowances for Credit Losses (Tables)

9 Months Ended

Sep. 30, 2023

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):

						September 30, 2023																								December 31, 2022
						Fixed Rate						Variable Rate						Non-accrual						Total						Fixed Rate						Variable Rate						Non-accrual						Total
Commercial						$	3,536,353					$	11,112,788					$	70,698					$	14,719,839					$	3,392,422					$	10,759,780					$	60,297					$	14,212,499
Commercial real estate						848,042						4,385,840						7,418						5,241,300						874,716						3,715,491						16,570						4,606,777
Loans to individuals						2,229,750						1,491,660						41,469						3,762,879						2,099,165						1,593,779						44,930						3,737,874
Total						$	6,614,145					$	16,990,288					$	119,585					$	23,724,018					$	6,366,303					$	16,069,050					$	121,797					$	22,557,150

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
						September 30, 2023
						Commercial						Commercial Real Estate												Loans to Individuals												Total
Allowance for loan losses:
Beginning balance						$	143,269					$	76,347											$	43,098											$	262,714
Provision for loan losses						1,158						11,152												3,621												15,931
Loans charged off						(6,769)						(2,238)												(1,586)												(10,593)
Recoveries of loans previously charged off						273						3,167												622												4,062
Ending balance						$	137,931					$	88,428											$	45,755											$	272,114
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance						$	20,294					$	37,681											$	1,965											$	59,940
Provision for off-balance sheet credit risk						(2,179)						(5,076)												(81)												(7,336)
Ending balance						$	18,115					$	32,605											$	1,884											$	52,604

						Nine Months Ended
						September 30, 2023
						Commercial						Commercial Real Estate												Loans to Individuals												Total
Allowance for loan losses:
Beginning balance						$	131,586					$	57,648											$	46,470											$	235,704
Provision for loan losses						12,908						35,878												1,627												50,413
Loans charged off						(9,578)						(8,446)												(4,285)												(22,309)
Recoveries of loans previously charged off						3,015						3,348												1,943												8,306
Ending balance						$	137,931					$	88,428											$	45,755											$	272,114
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance						$	18,246					$	40,490											$	2,183											$	60,919
Provision for off-balance sheet credit risk						(131)						(7,885)												(299)												(8,315)
Ending balance						$	18,115					$	32,605											$	1,884											$	52,604

						Three Months Ended
						September 30, 2022
						Commercial						Commercial Real Estate												Loans to Individuals												Total
Allowance for loan losses:
Beginning balance						$	137,562					$	62,997											$	40,555											$	241,114
Provision for loan losses						3,158						(4,415)												2,368												1,111
Loans charged off						(75)						—												(1,691)												(1,766)
Recoveries of loans previously charged off						721						7												581												1,309
Ending balance						$	141,366					$	58,589											$	41,813											$	241,768
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance						$	15,839					$	24,670											$	1,741											$	42,250
Provision for off-balance sheet credit risk						939						12,826												295												14,060
Ending balance						$	16,778					$	37,496											$	2,036											$	56,310

						Nine Months Ended
						September 30, 2022
						Commercial						Commercial Real Estate												Loans to Individuals												Total
Allowance for loan losses:
Beginning balance						$	162,056					$	58,553											$	35,812											$	256,421
Provision for loan losses						(17,428)						138												8,276												(9,014)
Loans charged off						(6,162)						(269)												(4,508)												(10,939)
Recoveries of loans previously charged off						2,900						167												2,233												5,300
Ending balance						$	141,366					$	58,589											$	41,813											$	241,768
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance						$	13,812					$	17,442											$	1,723											$	32,977
Provision for off-balance sheet credit risk						2,966						20,054												313												23,333
Ending balance						$	16,778					$	37,496											$	2,036											$	56,310

A $7.0 million provision for credit losses was necessary for the third quarter of 2023, reflecting modest improvement in the economic outlook and the impact of forecasted higher energy prices during the forecast period, offset by loan growth and the impact of a more challenging national commercial real estate environment, particularly related to office.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at September 30, 2023 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						$	14,649,141					$	136,285					$	70,698					$	1,646					$	14,719,839					$	137,931
Commercial real estate						5,233,882						88,428						7,418						—						5,241,300						88,428
Loans to individuals						3,721,410						45,755						41,469						—						3,762,879						45,755
Total						$	23,604,433					$	270,468					$	119,585					$	1,646					$	23,724,018					$	272,114

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2022 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						$	14,152,202					$	127,566					$	60,297					$	4,020					$	14,212,499					$	131,586
Commercial real estate						4,590,207						56,098						16,570						1,550						4,606,777						57,648
Loans to individuals						3,692,944						46,470						44,930						—						3,737,874						46,470
Total						$	22,435,353					$	230,134					$	121,797					$	5,570					$	22,557,150					$	235,704

Schedule of Credit Quality Indicators [Table Text Block]

The following table summarizes the Company’s loan portfolio at September 30, 2023 by the risk grade categories and vintage (in thousands): 

			Origination Year
			2023			2022			2021			2020			2019			Prior			Revolving Loans			Revolving Loans Converted to Term Loans			Total
Commercial:
Energy
Pass			$	192,614		$	106,593		$	45,795		$	8,190		$	10,463		$	12,518		$	3,064,120		$	—		$	3,440,293
Special Mention			—			—			—			—			—			—			13,950			—			13,950
Accruing Substandard			—			—			—			—			—			—			16,800			—			16,800
Nonaccrual			—			—			—			—			—			108			19,451			—			19,559
Total energy			192,614			106,593			45,795			8,190			10,463			12,626			3,114,321			—			3,490,602
Loans charged-off, year-to-date			—			—			—			—			—			—			—			—			—
Healthcare
Pass			485,617			903,150			573,317			464,170			338,944			947,581			268,806			16			3,981,601
Special Mention			—			—			18,719			—			2,421			18,072			980			—			40,192
Accruing Substandard			—			589			214			6,957			—			10,046			1,700			—			19,506
Nonaccrual			—			—			—			—			25,797			10,525			5,513			—			41,835
Total healthcare			485,617			903,739			592,250			471,127			367,162			986,224			276,999			16			4,083,134
Loans charged-off, year-to-date			—			—			—			—			—			—			—			—			—
Services
Pass			707,494			541,539			412,450			247,092			131,269			723,365			759,327			870			3,523,406
Special Mention			—			13,051			1,836			1,531			596			2,733			1,421			—			21,168
Accruing Substandard			—			5,752			730			1,716			2,333			3,446			4,957			33			18,967
Nonaccrual			—			—			2,161			337			—			—			322			—			2,820
Total services			707,494			560,342			417,177			250,676			134,198			729,544			766,027			903			3,566,361
Loans charged-off, year-to-date			—			—			3,360			—			—			—			1,577			—			4,937
General business
Pass			667,802			504,364			262,660			148,645			140,220			319,113			1,396,919			2,196			3,441,919
Special Mention			9,277			15,059			9,103			1,115			287			8,389			7,959			—			51,189
Accruing Substandard			3,956			37,025			1,440			37			—			—			37,693			—			80,151
Nonaccrual			—			—			—			—			—			54			6,385			44			6,483
Total general business			681,035			556,448			273,203			149,797			140,507			327,556			1,448,956			2,240			3,579,742
Loans charged-off, year-to-date			—			—			4,598			2			—			17			14			10			4,641
Total commercial			2,066,760			2,127,122			1,328,425			879,790			652,330			2,055,950			5,606,303			3,159			14,719,839
Commercial real estate:
Pass			361,934			1,730,828			1,211,694			480,710			555,902			723,783			139,721			—			5,204,572
Special Mention			—			—			—			—			—			19,212			—			—			19,212
Accruing Substandard			—			—			79			—			—			10,019			—			—			10,098
Nonaccrual			—			—			—			—			7,263			155			—			—			7,418
Total commercial real estate			361,934			1,730,828			1,211,773			480,710			563,165			753,169			139,721			—			5,241,300
Loans charged-off, year-to-date			—			—			—			—			—			8,446			—			—			8,446

			Origination Year
			2023			2022			2021			2020			2019			Prior			Revolving Loans			Revolving Loans Converted to Term Loans			Total
Loans to individuals:
Residential mortgage
Pass			320,680			332,368			348,782			354,284			57,944			252,027			366,136			22,277			2,054,498
Special Mention			—			359			262			1,339			—			152			3,144			88			5,344
Accruing Substandard			—			—			—			—			—			45			101			51			197
Nonaccrual			—			1,298			2,223			2,771			723			20,728			2,196			1,014			30,953
Total residential mortgage			320,680			334,025			351,267			358,394			58,667			272,952			371,577			23,430			2,090,992
Loans charged-off, year-to-date			—			—			51			4			—			14			1			—			70
Residential mortgage guaranteed by U.S. government agencies
Pass			—			1,624			2,030			4,749			6,752			135,502			—			—			150,657
Nonaccrual			—			—			—			280			376			9,779			—			—			10,435
Total residential mortgage guaranteed by U.S. government agencies			—			1,624			2,030			5,029			7,128			145,281			—			—			161,092
Personal:
Pass			161,514			227,726			167,566			137,761			133,304			158,721			523,513			195			1,510,300
Special Mention			100			30			103			22			2			—			—			—			257
Accruing Substandard			—			—			—			2			157			—			—			—			159
Nonaccrual			—			27			4			9			4			12			23			—			79
Total personal			161,614			227,783			167,673			137,794			133,467			158,733			523,536			195			1,510,795
Loans charged-off, year-to-date			—			60			40			41			—			4,042			26			6			4,215
Total loans to individuals			482,294			563,432			520,970			501,217			199,262			576,966			895,113			23,625			3,762,879
Total loans			$	2,910,988		$	4,421,382		$	3,061,168		$	1,861,717		$	1,414,757		$	3,386,085		$	6,641,137		$	26,784		$	23,724,018

The following table summarizes the Company's loan portfolio at December 31, 2022 by the risk grade categories and vintage (in thousands): 

			Origination Year
			2022			2021			2020			2019			2018			Prior			Revolving Loans			Revolving Loans Converted to Term Loans			Total
Commercial:
Energy
Pass			$	157,745		$	76,951		$	30,284		$	12,783		$	5,992		$	4,980		$	3,104,906		$	—		$	3,393,641
Accruing Substandard			—			—			—			664			385			683			28,018			—			29,750
Nonaccrual			—			—			—			—			—			159			1,240			—			1,399
Total energy			157,745			76,951			30,284			13,447			6,377			5,822			3,134,164			—			3,424,790
Healthcare
Pass			932,097			604,886			476,854			404,204			464,989			618,163			245,898			20			3,747,111
Special Mention			—			—			—			20,071			—			18,859			4			—			38,934
Accruing Substandard			—			—			—			—			—			14,304			3,634			—			17,938
Nonaccrual			—			—			—			26,480			6,373			8,181			—			—			41,034
Total healthcare			932,097			604,886			476,854			450,755			471,362			659,507			249,536			20			3,845,017
Services
Pass			821,785			496,510			286,085			193,481			156,736			696,300			722,371			639			3,373,907
Special Mention			502			5,139			989			771			894			1,345			8,668			—			18,308
Accruing Substandard			—			—			—			2,459			43			2,789			17,665			122			23,078
Nonaccrual			—			5,570			449			—			—			2,389			7,820			—			16,228
Total services			822,287			507,219			287,523			196,711			157,673			702,823			756,524			761			3,431,521
General business
Pass			725,894			361,839			198,274			172,878			139,140			283,694			1,570,536			2,329			3,454,584
Special Mention			17,759			13,065			208			71			7			2,291			7,094			26			40,521
Accruing Substandard			—			2,169			66			4,130			4,680			3,287			94			4			14,430
Nonaccrual			—			—			1,052			14			72			5			485			8			1,636
Total general business			743,653			377,073			199,600			177,093			143,899			289,277			1,578,209			2,367			3,511,171
Total commercial			2,655,782			1,566,129			994,261			838,006			779,311			1,657,429			5,718,433			3,148			14,212,499
Commercial real estate:
Pass			1,188,483			1,158,002			552,616			641,102			247,625			633,304			161,616			—			4,582,748
Accruing Substandard			—			—			—			7,459			—			—			—			—			7,459
Nonaccrual			—			—			—			—			—			16,570			—			—			16,570
Total commercial real estate			1,188,483			1,158,002			552,616			648,561			247,625			649,874			161,616			—			4,606,777

			Origination Year
			2022			2021			2020			2019			2018			Prior			Revolving Loans			Revolving Loans Converted to Term Loans			Total
Loans to individuals:
Residential mortgage
Pass			354,497			373,190			393,002			63,142			40,525			260,625			352,126			22,176			1,859,283
Special Mention			—			81			42			—			142			388			527			87			1,267
Accruing Substandard			—			—			187			—			—			138			117			1			443
Nonaccrual			32			1,656			2,717			362			1,904			20,139			2,216			765			29,791
Total residential mortgage			354,529			374,927			395,948			63,504			42,571			281,290			354,986			23,029			1,890,784
Residential mortgage guaranteed by U.S. government agencies
Pass			289			2,254			9,000			10,722			17,244			191,426			—			—			230,935
Nonaccrual			—			—			299			1,460			2,319			10,927			—			—			15,005
Total residential mortgage guaranteed by U.S. government agencies			289			2,254			9,299			12,182			19,563			202,353			—			—			245,940
Personal:
Pass			254,497			193,095			154,887			172,114			68,871			201,278			549,187			332			1,594,261
Special Mention			47			28			40			12			17			—			6,003			4			6,151
Accruing Substandard			—			444			—			160			—			—			—			—			604
Nonaccrual			38			7			12			22			14			18			23			—			134
Total personal			254,582			193,574			154,939			172,308			68,902			201,296			555,213			336			1,601,150
Total loans to individuals			609,400			570,755			560,186			247,994			131,036			684,939			910,199			23,365			3,737,874
Total loans			$	4,453,665		$	3,294,886		$	2,107,063		$	1,734,561		$	1,157,972		$	2,992,242		$	6,790,248		$	26,513		$	22,557,150

Financing Receivable, Nonaccrual [Table Text Block]

A summary of nonaccruing loans at September 30, 2023 follows (in thousands): 

			As of September 30, 2023
			Total						With No Allowance						With Allowance						Related Allowance
Commercial:
Energy			$	19,559					$	19,559					$	—					$	—
Healthcare			41,836						41,836						—						—
Services			2,820						337						2,483						1,646
General business			6,483						6,483						—						—
Total commercial			70,698						68,215						2,483						1,646
Commercial real estate			7,418						7,418						—						—
Loans to individuals:
Residential mortgage			30,954						30,954						—						—
Residential mortgage guaranteed by U.S. government agencies			10,436						10,436						—						—
Personal			79						79						—						—
Total loans to individuals			41,469						41,469						—						—
Total			$	119,585					$	117,102					$	2,483					$	1,646

A summary of nonaccruing loans at December 31, 2022 follows (in thousands): 

			As of December 31, 2022
			Total						With No Allowance						With Allowance						Related Allowance
Commercial:
Energy			$	1,399					$	1,399					$	—					$	—
Healthcare			41,034						34,661						6,373						946
Services			16,228						7,835						8,393						3,074
General business			1,636						1,636						—						—
Total commercial			60,297						45,531						14,766						4,020
Commercial real estate			16,570						393						16,177						1,550
Loans to individuals:
Residential mortgage			29,791						29,791						—						—
Residential mortgage guaranteed by U.S. government agencies			15,005						15,005						—						—
Personal			134						134						—						—
Total loans to individuals			44,930						44,930						—						—
Total			$	121,797					$	90,854					$	30,943					$	5,570

Summary of Loans by Aging Status [Table Text Block]

A summary of loans currently performing and past due as of September 30, 2023 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						$	3,490,602					$	—					$	—					$	—					$	3,490,602					$	—
Healthcare						4,051,359						10						—						31,765						4,083,134						—
Services						3,564,401						599						324						1,037						3,566,361						—
General business						3,573,237						37						112						6,356						3,579,742						13
Total commercial						14,679,599						646						436						39,158						14,719,839						13
Commercial real estate						5,233,549						—						488						7,263						5,241,300						—
Loans to individuals:
Residential mortgage						2,077,418						9,713						818						3,043						2,090,992						51
Residential mortgage guaranteed by U.S. government agencies						58,486						31,390						19,004						52,212						161,092						47,670
Personal						1,510,472						298						2						23						1,510,795						—
Total loans to individuals						3,646,376						41,401						19,824						55,278						3,762,879						47,721
Total						$	23,559,524					$	42,047					$	20,748					$	101,699					$	23,724,018					$	47,734

A summary of loans currently performing and past due as of December 31, 2022 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						$	3,424,766					$	24					$	—					$	—					$	3,424,790					$	—
Healthcare						3,812,164						5,914						26,480						459						3,845,017						—
Services						3,423,042						1,060						2,461						4,958						3,431,521						—
General business						3,509,094						257						1,424						396						3,511,171						396
Total commercial						14,169,066						7,255						30,365						5,813						14,212,499						396
Commercial real estate						4,606,029						531						—						217						4,606,777						—
Loans to individuals:
Residential mortgage						1,872,155						10,632						1,828						6,169						1,890,784						114
Residential mortgage guaranteed by U.S. government agencies						108,019						36,119						19,400						82,402						245,940						75,604
Personal						1,600,595						502						21						32						1,601,150						—
Total loans to individuals						3,580,769						47,253						21,249						88,603						3,737,874						75,718
Total						$	22,355,864					$	55,039					$	51,614					$	94,633					$	22,557,150					$	76,114

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