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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2026
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
September 30,
2026		December 31,
2025
Commitments to extend credit$12,773,085 $12,473,653 
Standby letters of credit435,506 394,714 
Deferred standby letter of credit fees3,368 2,740 
Commitments, Off-Balance-Sheet, Allowance for Credit Losses [Table Text Block]
The following table presents activity in the allowance for credit losses on off-balance-sheet credit exposures.
Three Months Ended
September 30,		Nine Months Ended
September 30,
2026202520262025
Beginning balance$50,325 $49,609 $51,298 $51,904 
Credit loss expense (benefit)(2,820)(2,418)(3,793)(4,713)
Ending balance$47,505 $47,191 $47,505 $47,191 
Lease Commitments, Components of Lease Expense [Table Text Block] We lease certain office facilities and office equipment under operating leases. The components of total lease expense were as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
2026202520262025
Amortization of lease right-of-use assets$9,256 $9,120 $27,654 $27,246 
Short-term lease expense624 154 1,735 727 
Non-lease components (including taxes, insurance, common maintenance, etc.)3,534 3,415 11,253 11,051 
Total$13,414 $12,689 $40,642 $39,024