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Fair Value Of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2026
Fair Value Of Financial Instruments [Abstract]  
Fair value of financial instruments [Table Text Block]
The estimated fair values of the Company’s financial instruments and the classification of their fair value measurement within the valuation hierarchy are as follows at March 31, 2026 and December 31, 2025:

Carrying Amount
Estimated Fair Value at March 31, 2026

(In thousands)

Level 1Level 2Level 3Total
Financial Assets
Loans:
Business$6,750,356 $— $— $6,659,674 $6,659,674 
Real estate - construction and land
1,581,789 — — 1,552,932 1,552,932 
Real estate - business
4,059,539 — — 3,985,397 3,985,397 
Real estate - personal
4,407,606 — — 4,120,937 4,120,937 
Consumer
2,475,353 — — 2,456,330 2,456,330 
Revolving home equity619,178 — — 604,966 604,966 
Consumer credit card557,733 — — 507,590 507,590 
Overdrafts
9,510 — — 9,392 9,392 
Total loans20,461,064 — — 19,897,218 19,897,218 
Loans held for sale2,081 — 2,081 — 2,081 
Investment securities8,984,988 3,206,719 5,528,980 249,289 8,984,988 
Federal funds sold630 630 — — 630 
Securities purchased under agreements to resell850,000 — — 862,125 862,125 
Interest earning deposits with banks3,270,046 3,270,046 — — 3,270,046 
Cash and due from banks572,588 572,588 — — 572,588 
Derivative instruments58,399 — 58,216 183 58,399 
Assets held in trust for deferred compensation plan22,437 22,437 — — 22,437 
       Total$34,222,233 $7,072,420 $5,589,277 $21,008,815 $33,670,512 
Financial Liabilities
Non-interest bearing deposits$8,058,024 $8,058,024 $— $— $8,058,024 
Savings, interest checking and money market deposits17,877,836 17,877,836 — — 17,877,836 
Certificates of deposit2,448,459 — — 2,477,568 2,477,568 
Federal funds purchased129,730 129,730 — — 129,730 
Securities sold under agreements to repurchase2,446,993 — — 2,449,446 2,449,446 
Other borrowings7,994 2,589 5,405 — 7,994 
Derivative instruments15,726 — 15,666 60 15,726 
Liabilities held in trust for deferred compensation plan22,437 22,437 — — 22,437 
       Total$31,007,199 $26,090,616 $21,071 $4,927,074 $31,038,761 
Carrying Amount
Estimated Fair Value at December 31, 2025

(In thousands)
Level 1Level 2Level 3Total
Financial Assets
Loans:
Business$6,439,380 $— $— $6,367,754 $6,367,754 
Real estate - construction and land
1,438,012 — — 1,415,490 1,415,490 
Real estate - business
3,674,567 — — 3,628,499 3,628,499 
Real estate - personal
3,053,435 — — 2,815,384 2,815,384 
Consumer
2,196,822 — — 2,188,772 2,188,772 
Revolving home equity375,159 — — 371,998 371,998 
Consumer credit card589,694 — — 535,660 535,660 
Overdrafts
4,194 — — 4,045 4,045 
Total loans17,771,263 — — 17,327,602 17,327,602 
Loans held for sale4,329 — 4,329 — 4,329 
Investment securities9,413,603 3,339,866 5,842,326 231,411 9,413,603 
Securities purchased under agreements to resell850,000 — — 869,427 869,427 
Interest earning deposits with banks2,744,393 2,744,393 — — 2,744,393 
Cash and due from banks803,239 803,239 — — 803,239 
Derivative instruments51,421 — 51,232 189 51,421 
Assets held in trust for deferred compensation plan23,276 23,276 — — 23,276 
       Total$31,661,524 $6,910,774 $5,897,887 $18,428,629 $31,237,290 
Financial Liabilities
Non-interest bearing deposits$8,205,711 $8,205,711 $— $— $8,205,711 
Savings, interest checking and money market deposits15,047,406 15,047,406 — — 15,047,406 
Certificates of deposit2,386,459 — — 2,418,268 2,418,268 
Federal funds purchased128,625 128,625 — — 128,625 
Securities sold under agreements to repurchase2,861,016 — — 2,863,921 2,863,921 
Other borrowings12,739 12,739 — — 12,739 
Derivative instruments18,795 — 18,718 77 18,795 
Liabilities held in trust for deferred compensation plan23,276 23,276 — — 23,276 
       Total$28,684,027 $23,417,757 $18,718 $5,282,266 $28,718,741