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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
September 30,
2024		December 31,
2023
Commitments to extend credit$12,161,223 $12,195,073 
Standby letters of credit433,399 438,635 
Deferred standby letter of credit fees2,354 2,912 
Commitments, Off-Balance-Sheet, Allowance for Credit Losses [Table Text Block]
The following table details activity in the allowance for credit losses on off-balance-sheet credit exposures.
Three Months Ended
September 30,		Nine Months Ended
September 30,
2024202320242023
Beginning balance$53,802 $52,881 $51,751 $58,593 
Credit loss expense (benefit)2,924 (2,466)4,975 (8,178)
Ending balance$56,726 $50,415 $56,726 $50,415 
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,
2024202320242023
Amortization of lease right-of-use assets$8,846 $8,220 $26,465 $25,732 
Short-term lease expense300 852 1,019 1,754 
Non-lease components (including taxes, insurance, common maintenance, etc.)2,546 3,269 9,561 10,312 
Total$11,692 $12,341 $37,045 $37,798