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Loans and Allowances for Credit Losses (Tables)
 9 Months Ended
Sep. 30, 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):
 September 30, 2025December 31, 2024
Fixed
Rate		Variable
Rate		Non-accrualTotalFixed
Rate		Variable
Rate		Non-accrualTotal
Commercial$3,400,985 $11,079,685 $32,270 $14,512,940 $3,450,238 $11,565,251 $14,647 $15,030,136 
Commercial real estate
659,296 5,086,502 6,809 5,752,607 668,532 4,380,015 9,905 5,058,452 
Loans to individuals2,906,281 1,660,051 33,315 4,599,647 2,620,936 1,383,027 22,173 4,026,136 
Total$6,966,562 $17,826,238 $72,394 $24,865,194 $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
September 30, 2025
 CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:    
Beginning balance$144,398 $85,107 $47,544 $277,049 
Provision for loan losses(4,262)4,055 4,477 4,270 
Loans charged off(3,157)— (1,191)(4,348)
Recoveries of loans previously charged off
79 81 561 721 
Ending balance$137,058 $89,243 $51,391 $277,692 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$16,995 $33,558 $2,439 $52,992 
Provision for off-balance sheet credit risk
1,839 (3,081)(966)(2,208)
Ending balance$18,834 $30,477 $1,473 $50,784 
Nine Months Ended
September 30, 2025
 CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:    
Beginning balance$145,153 $91,072 $43,810 $280,035 
Provision for loan losses(4,373)(1,979)9,302 2,950 
Loans charged off(4,277)(126)(3,549)(7,952)
Recoveries of loans previously charged off
555 276 1,828 2,659 
Ending balance$137,058 $89,243 $51,391 $277,692 
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
788 (1,482)(162)(856)
Ending balance$18,834 $30,477 $1,473 $50,784 
Three Months Ended
September 30, 2024
 CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:    
Beginning balance$150,737 $96,256 $40,833 $287,826 
Provision for loan losses918 (4,944)602 (3,424)
Loans charged off(856)— (1,640)(2,496)
Recoveries of loans previously charged off
1,562 226 762 2,550 
Ending balance$152,361 $91,538 $40,557 $284,456 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$17,316 $23,314 $1,706 $42,336 
Provision for off-balance sheet credit risk
357 5,058 15 5,430 
Ending balance$17,673 $28,372 $1,721 $47,766 
Nine Months Ended
September 30, 2024
CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:
Beginning balance$141,232 $94,718 $41,173 $277,123 
Provision for loan losses19,670 (1,991)2,005 19,684 
Loans charged off(11,487)(1,455)(4,554)(17,496)
Recoveries of loans previously charged off2,946 266 1,933 5,145 
Ending balance$152,361 $91,538 $40,557 $284,456 
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(2,089)933 (55)(1,211)
Ending balance$17,673 $28,372 $1,721 $47,766 

A $2.0 million provision for credit losses was necessary for the third quarter of 2025, reflecting the impact of loan growth during the quarter, partially offset by a slight improvement in economic forecast scenarios.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at September 30, 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$14,480,670 $134,908 $32,270 $2,150 $14,512,940 $137,058 
Commercial real estate5,745,798 87,048 6,809 2,195 5,752,607 89,243 
Loans to individuals4,566,332 51,391 33,315 — 4,599,647 51,391 
Total$24,792,800 $273,347 $72,394 $4,345 $24,865,194 $277,692 
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 September 30, 2025, by the risk grade categories and vintage (in thousands): 
Origination Year
20252024202320222021PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Healthcare
Pass$633,845 $492,224 $471,134 $725,177 $452,204 $701,112 $182,468 $11 $3,658,175 
Special Mention— — — 43,817 99 — 215 — 44,131 
Accruing Substandard— 9,633 37,655 4,178 5,192 89,055 6,017 — 151,730 
Nonaccrual— — 15,080 83 377 8,788 179 — 24,507 
Total healthcare633,845 501,857 523,869 773,255 457,872 798,955 188,879 11 3,878,543 
Services
Pass421,853 497,289 563,115 390,330 291,597 650,606 838,852 163 3,653,805 
Special Mention57 1,425 389 2,179 — 15,991 1,356 — 21,397 
Accruing Substandard4,621 226 10,800 1,440 2,263 7,929 515 — 27,794 
Nonaccrual414 29 42 879 183 146 5,954 — 7,647 
Total services426,945 498,969 574,346 394,828 294,043 674,672 846,677 163 3,710,643 
Loans charged off, year-to-date— — — — — — 3,242 21 3,263 
Energy
Pass125,265 70,851 46,400 10,977 2,383 21,235 2,382,659 — 2,659,770 
Accruing Substandard— — — — — — 21,711 — 21,711 
Nonaccrual— — — — — 31 — — 31 
Total energy125,265 70,851 46,400 10,977 2,383 21,266 2,404,370 — 2,681,512 
Loans charged off, year-to-date— — — — — — 94 — 94 
General business
Pass709,654 464,843 420,590 207,485 156,634 334,999 1,826,400 1,643 4,122,248 
Special Mention3,488 1,745 1,152 2,368 — 551 43,252 48 52,604 
Accruing Substandard871 5,406 7,497 34,105 1,745 10,557 7,124 — 67,305 
Nonaccrual— — — — — 48 — 37 85 
Total general business714,013 471,994 429,239 243,958 158,379 346,155 1,876,776 1,728 4,242,242 
Loans charged off, year-to-date8 — 132 — — — 751 29 920 
Total commercial1,900,068 1,543,671 1,573,854 1,423,018 912,677 1,841,048 5,316,702 1,902 14,512,940 
Commercial real estate:
Pass738,423 815,271 531,581 1,898,991 725,665 859,915 104,375 — 5,674,221 
Special Mention— — — — — 3,129 — — 3,129 
Accruing Substandard— 486 — 4,977 29,324 33,661 — — 68,448 
Nonaccrual— — — — — 6,809 — — 6,809 
Total commercial real estate738,423 815,757 531,581 1,903,968 754,989 903,514 104,375 — 5,752,607 
Loans charged off, year-to-date— — — 126 — — — — 126 
Origination Year
20252024202320222021PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Loans to individuals:
Residential mortgage
Pass446,478 431,184 283,185 259,320 287,695 472,200 440,835 25,256 2,646,153 
Special Mention— 211 55 212 87 5,579 1,059 1,233 8,436 
Accruing Substandard— 169 84 — — 86 183 — 522 
Nonaccrual16 694 2,278 2,053 1,276 9,668 4,462 808 21,255 
Total residential mortgage446,494 432,258 285,602 261,585 289,058 487,533 446,539 27,297 2,676,366 
Loans charged off, year-to-date— — 48 — — 56 178 — 282 
Residential mortgage guaranteed by U.S. government agencies
Pass— 2,504 7,145 8,339 3,512 122,794 — — 144,294 
Nonaccrual— — — — — 7,348 — — 7,348 
Total residential mortgage guaranteed by U.S. government agencies
— 2,504 7,145 8,339 3,512 130,142 — — 151,642 
Personal
Pass367,936 232,742 198,942 148,235 101,747 213,229 482,518 344 1,745,693 
Special Mention37 48 50 10 20 5 1,212 — 1,382 
Accruing Substandard6,703 21 — — — 128 13,000 — 19,852 
Nonaccrual7 41 4,636 12 14 2 — — 4,712 
Total personal374,683 232,852 203,628 148,257 101,781 213,364 496,730 344 1,771,639 
Loans charged off, year-to-date1
3,130 66 22 19 — 5 25 — 3,267 
Total loans to individuals821,177 667,614 496,375 418,181 394,351 831,039 943,269 27,641 4,599,647 
Total loans$3,459,668 $3,027,042 $2,601,810 $3,745,167 $2,062,017 $3,575,601 $6,364,346 $29,543 $24,865,194 
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 agencies
462 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 September 30, 2025, follows (in thousands): 
As of September 30, 2025
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Healthcare$24,507 $19,405 $5,102 $200 
Services7,647 1,849 5,798 1,950 
Energy31 31 — — 
General business85 85 — — 
Total commercial32,270 21,370 10,900 2,150 
Commercial real estate6,809 — 6,809 2,195 
Loans to individuals:    
Residential mortgage21,255 21,255 — — 
Residential mortgage guaranteed by U.S. government agencies7,348 7,348 — — 
Personal4,712 4,712 — — 
Total loans to individuals33,315 33,315 — — 
Total$72,394 $54,685 $17,709 $4,345 

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 September 30, 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$3,854,648 $15,107 $— $8,788 $3,878,543 $— 
Services3,710,413 201 29 — 3,710,643 — 
Energy2,681,512 — — — 2,681,512 — 
General business4,238,920 3,081 54 187 4,242,242 187 
Total commercial14,485,493 18,389 83 8,975 14,512,940 187 
Commercial real estate5,745,609 — 233 6,765 5,752,607 — 
Loans to individuals:    
Residential mortgage2,651,541 14,281 2,864 7,680 2,676,366 148 
Residential mortgage guaranteed by U.S. government agencies53,712 17,701 13,677 66,552 151,642 61,791 
Personal1,750,804 15,327 77 5,431 1,771,639 800 
Total loans to individuals4,456,057 47,309 16,618 79,663 4,599,647 62,739 
Total$24,687,159 $65,698 $16,934 $95,403 $24,865,194 $62,926 
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