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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
March 31,
2026		December 31,
2025
Commitments to extend credit$12,168,841 $12,473,653 
Standby letters of credit449,690 394,714 
Deferred standby letter of credit fees2,589 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
March 31,
20262025
Beginning balance$51,298 $51,904 
Credit loss expense (benefit)(3,716)(1,958)
Ending balance$47,582 $49,946 
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
March 31,
20262025
Amortization of lease right-of-use assets$9,182 $9,041 
Short-term lease expense523 334 
Non-lease components (including taxes, insurance, common maintenance, etc.)3,913 3,754 
Total$13,618 $13,129