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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
September 30,
2023		December 31,
2022
Commitments to extend credit$12,053,260 $12,137,957 
Standby letters of credit370,718 383,851 
Deferred standby letter of credit fees1,972 2,236 
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,
2023202220232022
Beginning balance$52,881 $50,246 $58,593 $50,314 
Credit loss expense (benefit)(2,466)2,463 (8,178)2,395 
Ending balance$50,415 $52,709 $50,415 $52,709 
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,
2023202220232022
Amortization of lease right-of-use assets$8,220 $8,389 $25,732 $24,703 
Short-term lease expense852 536 1,754 1,639 
Non-lease components (including taxes, insurance, common maintenance, etc.)3,269 3,092 10,312 8,860 
Total$12,341 $12,017 $37,798 $35,202