v3.25.2
Loans and Allowances for Credit Losses (Tables)
 6 Months Ended
Jun. 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):
 June 30, 2025December 31, 2024
Fixed
Rate		Variable
Rate		Non-accrualTotalFixed
Rate		Variable
Rate		Non-accrualTotal
Commercial$3,445,595 $10,898,430 $40,157 $14,384,182 $3,450,238 $11,565,251 $14,647 $15,030,136 
Commercial real estate
684,294 4,830,222 6,925 5,521,441 668,532 4,380,015 9,905 5,058,452 
Loans to individuals2,817,648 1,536,695 32,245 4,386,588 2,620,936 1,383,027 22,173 4,026,136 
Total$6,947,537 $17,265,347 $79,327 $24,292,211 $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
June 30, 2025
 CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:    
Beginning balance$143,505 $93,724 $41,365 $278,594 
Provision for loan losses744 (8,501)6,773 (984)
Loans charged off(35)(126)(1,152)(1,313)
Recoveries of loans previously charged off
184 10 558 752 
Ending balance$144,398 $85,107 $47,544 $277,049 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$16,167 $33,461 $2,460 $52,088 
Provision for off-balance sheet credit risk
828 97 (21)904 
Ending balance$16,995 $33,558 $2,439 $52,992 
Six Months Ended
June 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(111)(6,034)4,825 (1,320)
Loans charged off(1,120)(126)(2,358)(3,604)
Recoveries of loans previously charged off
476 195 1,267 1,938 
Ending balance$144,398 $85,107 $47,544 $277,049 
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
(1,051)1,599 804 1,352 
Ending balance$16,995 $33,558 $2,439 $52,992 
Three Months Ended
June 30, 2024
 CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:    
Beginning balance$146,267 $97,479 $37,877 $281,623 
Provision for loan losses10,441 (1,042)3,749 13,148 
Loans charged off(6,391)(205)(1,344)(7,940)
Recoveries of loans previously charged off
420 24 551 995 
Ending balance$150,737 $96,256 $40,833 $287,826 
Allowance for off-balance sheet credit risk from unfunded loan commitments:
Beginning balance$17,790 $27,865 $1,664 $47,319 
Provision for off-balance sheet credit risk
(474)(4,551)42 (4,983)
Ending balance$17,316 $23,314 $1,706 $42,336 
Six Months Ended
June 30, 2024
CommercialCommercial Real EstateLoans to IndividualsTotal
Allowance for loan losses:
Beginning balance$141,232 $94,718 $41,173 $277,123 
Provision for loan losses18,752 2,953 1,403 23,108 
Loans charged off(10,631)(1,455)(2,914)(15,000)
Recoveries of loans previously charged off1,384 40 1,171 2,595 
Ending balance$150,737 $96,256 $40,833 $287,826 
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(2,446)(4,125)(70)(6,641)
Ending balance$17,316 $23,314 $1,706 $42,336 
No provision for credit losses was necessary for the second quarter of 2025, primarily due to further improvements in portfolio credit quality offset by the impact of loan growth during the quarter.

The allowance for loan losses and recorded investment of the related loans by portfolio segment for each measurement method at June 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$14,344,025 $140,674 $40,157 $3,724 $14,384,182 $144,398 
Commercial real estate5,514,516 85,107 6,925 — 5,521,441 85,107 
Loans to individuals4,354,343 47,544 32,245 — 4,386,588 47,544 
Total$24,212,884 $273,325 $79,327 $3,724 $24,292,211 $277,049 
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 June 30, 2025, by the risk grade categories and vintage (in thousands): 
Origination Year
20252024202320222021PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Commercial:
Healthcare
Pass$364,559 $530,397 $468,105 $839,066 $392,630 $772,396 $197,981 $13 $3,565,147 
Special Mention— — — 64,388 103 3,315 214 — 68,020 
Accruing Substandard— — 37,806 5,132 5,215 98,852 21 — 147,026 
Nonaccrual— — 15,665 124 454 12,305 195 — 28,743 
Total healthcare364,559 530,397 521,576 908,710 398,402 886,868 198,411 13 3,808,936 
Services
Pass218,684 538,894 595,308 412,456 343,648 695,385 794,189 382 3,598,946 
Special Mention— — 3,283 — 937 14,036 3,054 — 21,310 
Accruing Substandard4,020 234 2,313 684 1,218 8,529 9,851 373 27,222 
Nonaccrual495 — 47 898 198 152 9,539 — 11,329 
Total services223,199 539,128 600,951 414,038 346,001 718,102 816,633 755 3,658,807 
Loans charged off, year-to-date— — — — — — 492 21 513 
Energy
Pass93,810 87,071 39,394 11,435 2,437 22,107 2,456,182 — 2,712,436 
Special Mention— — — — — — 22,237 — 22,237 
Nonaccrual— — — — — 40 — — 40 
Total energy93,810 87,071 39,394 11,435 2,437 22,147 2,478,419 — 2,734,713 
Loans charged off, year-to-date— — — — — — 94 — 94 
General business
Pass491,792 533,585 457,383 224,337 162,742 359,982 1,880,453 1,892 4,112,166 
Special Mention457 2,595 1,424 2,020 — — 6,119 43 12,658 
Accruing Substandard558 2,267 8,015 29,916 2,033 6,458 7,589 21 56,857 
Nonaccrual— — — — 1 10 — 34 45 
Total general business492,807 538,447 466,822 256,273 164,776 366,450 1,894,161 1,990 4,181,726 
Loans charged off, year-to-date— — 132 — — 6 367 8 513 
Total commercial1,174,375 1,695,043 1,628,743 1,590,456 911,616 1,993,567 5,387,624 2,758 14,384,182 
Commercial real estate:
Pass366,111 670,413 567,448 2,011,168 715,266 986,490 118,824 — 5,435,720 
Special Mention— — 233 — 29,324 — — — 29,557 
Accruing Substandard— 488 — 7,336 — 41,415 — — 49,239 
Nonaccrual— — — — — 6,925 — — 6,925 
Total commercial real estate366,111 670,901 567,681 2,018,504 744,590 1,034,830 118,824 — 5,521,441 
Loans charged off, year-to-date— — — 126 — — — — 126 
Origination Year
20252024202320222021PriorRevolving LoansRevolving Loans Converted to Term LoansTotal
Loans to individuals:
Residential mortgage
Pass309,071 455,755 305,393 267,128 301,090 500,039 422,935 25,782 2,587,193 
Special Mention— 318 147 156 29 109 1,548 31 2,338 
Accruing Substandard— — — — — 1 495 — 496 
Nonaccrual— 294 2,180 2,397 1,160 9,872 4,304 447 20,654 
Total residential mortgage309,071 456,367 307,720 269,681 302,279 510,021 429,282 26,260 2,610,681 
Loans charged off, year-to-date— — 48 — — 57 130 — 235 
Residential mortgage guaranteed by U.S. government agencies
Pass— 2,399 5,659 8,022 2,741 122,654 — — 141,475 
Nonaccrual— — — — — 6,978 — — 6,978 
Total residential mortgage guaranteed by U.S. government agencies— 2,399 5,659 8,022 2,741 129,632 — — 148,453 
Personal
Pass176,927 239,541 198,752 155,568 105,304 239,385 492,130 341 1,607,948 
Special Mention— 19 — 9 822 6 5,869 — 6,725 
Accruing Substandard— 23 8,017 — — 128 — — 8,168 
Nonaccrual— — 4,596 11 4 2 — — 4,613 
Total personal176,927 239,583 211,365 155,588 106,130 239,521 497,999 341 1,627,454 
Loans charged off, year-to-date1
2,024 58 — 11 — 5 25 — 2,123 
Total loans to individuals485,998 698,349 524,744 433,291 411,150 879,174 927,281 26,601 4,386,588 
Total loans$2,026,484 $3,064,293 $2,721,168 $4,042,251 $2,067,356 $3,907,571 $6,433,729 $29,359 $24,292,211 
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 June 30, 2025, follows (in thousands): 
As of June 30, 2025
 TotalWith No
Allowance		With AllowanceRelated Allowance
Commercial:    
Healthcare$28,743 $23,643 $5,100 $200 
Services11,329 1,949 9,380 3,524 
Energy40 40 — — 
General business45 45 — — 
Total commercial40,157 25,677 14,480 3,724 
Commercial real estate6,925 6,925 — — 
Loans to individuals:    
Residential mortgage20,654 20,654 — — 
Residential mortgage guaranteed by U.S. government agencies6,978 6,978 — — 
Personal4,613 4,613 — — 
Total loans to individuals32,245 32,245 — — 
Total$79,327 $64,847 $14,480 $3,724 

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 June 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$3,780,284 $3,293 $16,258 $9,101 $3,808,936 $— 
Services3,653,722 4,046 1,021 18 3,658,807 18 
Energy2,734,713 — — — 2,734,713 — 
General business4,180,013 472 1,232 9 4,181,726 9 
Total commercial14,348,732 7,811 18,511 9,128 14,384,182 27 
Commercial real estate5,507,214 6,251 — 7,976 5,521,441 1,050 
Loans to individuals:    
Residential mortgage2,586,725 12,596 2,906 8,454 2,610,681 311 
Residential mortgage guaranteed by U.S. government agencies51,434 17,866 12,716 66,437 148,453 61,464 
Personal1,620,937 1,889 34 4,594 1,627,454 — 
Total loans to individuals4,259,096 32,351 15,656 79,485 4,386,588 61,775 
Total$24,115,042 $46,413 $34,167 $96,589 $24,292,211 $62,852 
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