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Loans and Allowances for Credit Losses (Tables)
 3 Months Ended
Mar. 31, 2025
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):
 March 31, 2025December 31, 2024
Fixed
Rate		Variable
Rate		Non-accrualTotalFixed
Rate		Variable
Rate		Non-accrualTotal
Commercial$3,410,759 $10,949,605 $43,067 $14,403,431 $3,450,238 $11,565,251 $14,647 $15,030,136 
Commercial real estate
668,160 4,482,251 13,125 5,163,536 668,532 4,380,015 9,905 5,058,452 
Loans to individuals2,662,488 1,433,705 27,328 4,123,521 2,620,936 1,383,027 22,173 4,026,136 
Total$6,741,407 $16,865,561 $83,520 $23,690,488 $6,739,706 $17,328,293 $46,725 $24,114,724 
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
March 31, 2025
 CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:    
Beginning balance$145,153 $91,072 $43,810 $280,035 
Provision for loan losses(855)2,467 (1,948)(336)
Loans charged off(1,085)— (1,206)(2,291)
Recoveries of loans previously charged off
292 185 709 1,186 
Ending balance$143,505 $93,724 $41,365 $278,594 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$18,046 $31,959 $1,635 $51,640 
Provision for off-balance sheet credit risk
(1,879)1,502 825 448 
Ending balance$16,167 $33,461 $2,460 $52,088 
Three Months Ended
March 31, 2024
 CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:    
Beginning balance$141,232 $94,718 $41,173 $277,123 
Provision for loan losses8,311 3,995 (2,346)9,960 
Loans charged off(4,240)(1,250)(1,570)(7,060)
Recoveries of loans previously charged off
964 16 620 1,600 
Ending balance$146,267 $97,479 $37,877 $281,623 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$19,762 $27,439 $1,776 $48,977 
Provision for off-balance sheet credit risk
(1,972)426 (112)(1,658)
Ending balance$17,790 $27,865 $1,664 $47,319 
No provision for credit losses was necessary for the first quarter of 2025. A worse economic outlook compared to the prior quarter was offset by decreased loan balances and further improvements in portfolio credit quality during the quarter.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at March 31, 2025, is as follows (in thousands):
 Collectively Measured
for General Allowances		Individually Measured
for Specific Allowances		Total
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$14,360,364 $143,505 $43,067 $— $14,403,431 $143,505 
Commercial real estate5,150,411 93,724 13,125 — 5,163,536 93,724 
Loans to individuals4,096,193 41,365 27,328 — 4,123,521 41,365 
Total$23,606,968 $278,594 $83,520 $— $23,690,488 $278,594 
The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at December 31, 2024, is as follows (in thousands):

 Collectively Measured
for General Allowances		Individually Measured
for Specific Allowances		Total
 Recorded InvestmentRelated AllowanceRecorded InvestmentRelated AllowanceRecorded InvestmentRelated
Allowance
Commercial$15,015,489 $144,877 $14,647 $276 $15,030,136 $145,153 
Commercial real estate5,048,547 91,072 9,905 — 5,058,452 91,072 
Loans to individuals4,003,963 43,810 22,173 — 4,026,136 43,810 
Total$24,067,999 $279,759 $46,725 $276 $24,114,724 $280,035 
Schedule of Credit Quality Indicators [Table Text Block]
The following table summarizes the Company’s loan portfolio at March 31, 2025, by the risk grade categories and vintage (in thousands): 
Origination Year
20252024202320222021PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Healthcare
Pass$150,623 $538,884 $454,541 $865,217 $431,766 $846,283 $230,867 $9 $3,518,190 
Special Mention— — 15,000 64,641 107 3,368 254 — 83,370 
Accruing Substandard— — 37,969 5,171 15,302 99,276 915 — 158,633 
Nonaccrual— — 15,883 127 454 12,594 195 — 29,253 
Total healthcare150,623 538,884 523,393 935,156 447,629 961,521 232,231 9 3,789,446 
Services
Pass111,675 575,464 631,261 424,323 393,206 740,756 773,337 427 3,650,449 
Special Mention— — 3,592 — 947 12,348 4,022 — 20,909 
Accruing Substandard— 241 2,152 2,449 1,311 13,018 256 387 19,814 
Nonaccrual— — 52 917 213 160 12,320 — 13,662 
Total services111,675 575,705 637,057 427,689 395,677 766,282 789,935 814 3,704,834 
Loans charged off, year-to-date— — — — — — 491 — 491 
Energy
Pass73,695 107,688 41,449 29,086 2,560 30,295 2,566,209 — 2,850,982 
Accruing Substandard— — — — — — 9,299 — 9,299 
Nonaccrual— — — — — 49 — — 49 
Total energy73,695 107,688 41,449 29,086 2,560 30,344 2,575,508 — 2,860,330 
Loans charged off, year-to-date— — — — — — 94 — 94 
General business
Pass246,193 612,237 512,552 250,713 166,324 385,834 1,784,046 2,122 3,960,021 
Special Mention— 2,286 4,571 3,722 260 — 630 — 11,469 
Accruing Substandard558 4,565 11,304 41,766 2,296 6,674 10,065 — 77,228 
Nonaccrual— — — — — 17 40 46 103 
Total general business246,751 619,088 528,427 296,201 168,880 392,525 1,794,781 2,168 4,048,821 
Loans charged off, year-to-date— — 132 — — — 368 — 500 
Total commercial582,744 1,841,365 1,730,326 1,688,132 1,014,746 2,150,672 5,392,455 2,991 14,403,431 
Commercial real estate:
Pass96,485 525,418 529,670 2,020,930 784,480 1,026,071 111,034 — 5,094,088 
Special Mention— — 273 — 12,904 9,401 — — 22,578 
Accruing Substandard— 490 — 1,092 — 32,163 — — 33,745 
Nonaccrual— — — 3,272 — 9,853 — — 13,125 
Total commercial real estate96,485 525,908 529,943 2,025,294 797,384 1,077,488 111,034 — 5,163,536 
Origination Year
20252024202320222021PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Loans to individuals:
Residential mortgage
Pass97,566 480,639 325,937 278,335 310,003 534,068 394,986 26,915 2,448,449 
Special Mention— 90 86 319 — 83 1,314 7 1,899 
Accruing Substandard— — — — — 9 486 — 495 
Nonaccrual— 240 2,093 1,932 1,259 10,485 3,965 528 20,502 
Total residential mortgage97,566 480,969 328,116 280,586 311,262 544,645 400,751 27,450 2,471,345 
Loans charged off, year-to-date— — — — — — 92 — 92 
Residential mortgage guaranteed by U.S. government agencies
Pass— 1,079 4,444 7,977 2,495 110,672 — — 126,667 
Nonaccrual— — — — — 6,786 — — 6,786 
Total residential mortgage guaranteed by U.S. government agencies— 1,079 4,444 7,977 2,495 117,458 — — 133,453 
Personal
Pass40,722 245,553 172,538 170,792 112,377 249,820 525,396 449 1,517,647 
Special Mention— 40 16 14 820 16 — — 906 
Accruing Substandard— — — — — 129 1 — 130 
Nonaccrual— 2 2 25 5 5 1 — 40 
Total personal40,722 245,595 172,556 170,831 113,202 249,970 525,398 449 1,518,723 
Loans charged off, year-to-date1
1,036 50 — — — 5 23 — 1,114 
Total loans to individuals138,288 727,643 505,116 459,394 426,959 912,073 926,149 27,899 4,123,521 
Total loans$817,517 $3,094,916 $2,765,385 $4,172,820 $2,239,089 $4,140,233 $6,429,638 $30,890 $23,690,488 
1    Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due.
The following table summarizes the Company's loan portfolio at December 31, 2024, by the risk grade categories and vintage (in thousands): 
Origination Year
20242023202220212020PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Healthcare
Pass$539,305 $544,103 $896,042 $481,816 $344,609 $644,441 $249,793 $10 $3,700,119 
Special Mention— 15,000 64,895 110 — 32,555 255 — 112,815 
Accruing Substandard— 38,180 5,253 15,529 51,134 29,151 1,635 — 140,882 
Nonaccrual— — 96 463 — 13,158 — — 13,717 
Total healthcare539,305 597,283 966,286 497,918 395,743 719,305 251,683 10 3,967,533 
Loans charged off, year-to-date— — — — — 7,240 — — 7,240 
Services
Pass629,978 625,969 422,015 404,949 187,324 570,775 745,853 379 3,587,242 
Special Mention— 3,324 123 1,537 — 11,796 17,923 — 34,703 
Accruing Substandard— 675 9,030 20 1,217 7,750 1,399 400 20,491 
Nonaccrual— — — — — — 767 — 767 
Total services629,978 629,968 431,168 406,506 188,541 590,321 765,942 779 3,643,203 
Loans charged off, year-to-date— — — — 22 80 9 — 111 
Energy
Pass148,972 46,094 39,050 2,621 6,488 16,989 2,985,161 — 3,245,375 
Accruing Substandard— — — — — — 9,300 — 9,300 
Nonaccrual— — — — — 49 — — 49 
Total energy148,972 46,094 39,050 2,621 6,488 17,038 2,994,461 — 3,254,724 
Loans charged off, year-to-date— — — — — — 226 — 226 
General business
Pass740,440 571,897 267,528 176,468 117,755 319,986 1,862,643 1,938 4,058,655 
Special Mention4,399 5,749 4,285 7,002 224 1,736 3,037 — 26,432 
Accruing Substandard3,980 15,872 43,300 4,764 992 4,708 5,859 — 79,475 
Nonaccrual— 32 — — — 23 — 59 114 
Total general business748,819 593,550 315,113 188,234 118,971 326,453 1,871,539 1,997 4,164,676 
Loans charged off, year-to-date— 27 1,465 — — 166 2,425 103 4,186 
Total commercial2,067,074 1,866,895 1,751,617 1,095,279 709,743 1,653,117 5,883,625 2,786 15,030,136 
Commercial real estate:
Pass436,206 512,614 2,004,558 793,161 233,619 810,497 141,307 — 4,931,962 
Special Mention— 313 14,907 32,131 — — — — 47,351 
Accruing Substandard— — 36,981 — — 32,253 — — 69,234 
Nonaccrual— — — — — 9,905 — — 9,905 
Total commercial real estate436,206 512,927 2,056,446 825,292 233,619 852,655 141,307 — 5,058,452 
Loans charged off, year-to-date— — — — — 1,455 — — 1,455 
Origination Year
20242023202220212020PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Loans to individuals:
Residential mortgage
Pass530,186 338,187 286,865 318,935 314,814 210,251 395,943 22,929 2,418,110 
Special Mention— 167 148 219 — 113 1,767 — 2,414 
Accruing Substandard— — 163 — — 45 898 67 1,173 
Nonaccrual245 1,758 990 522 583 7,420 3,221 522 15,261 
Total residential mortgage530,431 340,112 288,166 319,676 315,397 217,829 401,829 23,518 2,436,958 
Loans charged off, year-to-date— 43 — — — 18 10 — 71 
Residential mortgage guaranteed by U.S. government agencies
Pass462 4,337 6,618 2,432 3,506 112,491 — — 129,846 
Nonaccrual— — — — 280 6,523 — — 6,803 
Total residential mortgage guaranteed by U.S. government agencies462 4,337 6,618 2,432 3,786 119,014 — — 136,649 
Personal
Pass245,737 149,572 167,272 115,710 107,291 151,030 510,147 2,619 1,449,378 
Special Mention18 17 30 825 8 — 8 — 906 
Accruing Substandard16 — — — 1 129 1,990 — 2,136 
Nonaccrual31 3 30 13 4 5 23 — 109 
Total personal245,802 149,592 167,332 116,548 107,304 151,164 512,168 2,619 1,452,529 
Loans charged off, year-to-date1
5,269 69 101 52 9 — 26 20 5,546 
Total loans to individuals776,695 494,041 462,116 438,656 426,487 488,007 913,997 26,137 4,026,136 
Total loans$3,279,975 $2,873,863 $4,270,179 $2,359,227 $1,369,849 $2,993,779 $6,938,929 $28,923 $24,114,724 
1    Includes charge-offs on deposit overdrafts, which are generally charged off at 60 days past due.
Financing Receivable, Nonaccrual [Table Text Block]
A summary of nonaccruing loans at March 31, 2025, follows (in thousands): 
As of March 31, 2025
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Healthcare$29,253 $29,253 $— $— 
Services13,662 13,662 — — 
Energy49 49 — — 
General business103 103 — — 
Total commercial43,067 43,067 — — 
Commercial real estate13,125 13,125 — — 
Loans to individuals:    
Residential mortgage20,502 20,502 — — 
Residential mortgage guaranteed by U.S. government agencies6,786 6,786 — — 
Personal40 40 — — 
Total loans to individuals27,328 27,328 — — 
Total$83,520 $83,520 $— $— 

The majority of our nonaccruing loans are considered collateral dependent where repayment is expected to be provided through operation or sale of the collateral. Nonaccruing commercial and commercial real estate loans are primarily secured by commercial real estate and nonaccruing residential mortgage loans are secured by residential real estate.

A summary of nonaccruing loans at December 31, 2024, follows (in thousands): 
As of December 31, 2024
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Healthcare$13,717 $13,717 $— $— 
Services767 491 276 276 
Energy49 49 — — 
General business114 114 — — 
Total commercial14,647 14,371 276 276 
Commercial real estate9,905 9,905 — — 
Loans to individuals:    
Residential mortgage15,261 15,261 — — 
Residential mortgage guaranteed by U.S. government agencies6,803 6,803 — — 
Personal109 109 — — 
Total loans to individuals22,173 22,173 — — 
Total$46,725 $46,449 $276 $276 
Summary of Loans by Aging Status [Table Text Block]
A summary of loans currently performing and past due as of March 31, 2025, is as follows (in thousands):
  Past Due Past Due 90 Days or More and Accruing
 Current30 to 59
Days		60 to 89 Days90 Days
or More		Total
Commercial:    
Healthcare$3,764,379 $15,829 $— $9,238 $3,789,446 $— 
Services3,702,696 2,119 — 19 3,704,834 19 
Energy2,860,330 — — — 2,860,330 — 
General business4,045,983 30 956 1,852 4,048,821 1,805 
Total commercial14,373,388 17,978 956 11,109 14,403,431 1,824 
Commercial real estate5,152,633 1,050 114 9,739 5,163,536 — 
Loans to individuals:    
Residential mortgage2,447,647 13,912 596 9,190 2,471,345 265 
Residential mortgage guaranteed by U.S. government agencies32,944 30,072 — 70,437 133,453 65,720 
Personal1,512,088 5,454 1 1,180 1,518,723 1,169 
Total loans to individuals3,992,679 49,438 597 80,807 4,123,521 67,154 
Total$23,518,700 $68,466 $1,667 $101,655 $23,690,488 $68,978 
A summary of loans currently performing and past due as of December 31, 2024, is as follows (in thousands):
  Past Due Past Due 90 Days or More and Accruing
 Current30 to 59
Days		60 to 89 Days90 Days
or More		Total
Commercial:    
Healthcare$3,932,142 $25,778 $— $9,613 $3,967,533 $— 
Services3,642,436 — 767 — 3,643,203 — 
Energy3,254,724 — — — 3,254,724 — 
General business4,161,510 3,067 70 29 4,164,676 — 
Total commercial14,990,812 28,845 837 9,642 15,030,136 — 
Commercial real estate5,048,667 — — 9,785 5,058,452 — 
Loans to individuals:    
Residential mortgage2,416,633 10,930 5,622 3,773 2,436,958 — 
Residential mortgage guaranteed by U.S. government agencies
45,910 18,514 15,268 56,957 136,649 52,504 
Personal1,451,397 1,061 48 23 1,452,529 — 
Total loans to individuals3,913,940 30,505 20,938 60,753 4,026,136 52,504 
Total$23,953,419 $59,350 $21,775 $80,180 $24,114,724 $52,504