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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
June 30,
2023		December 31,
2022
Commitments to extend credit$12,208,032 $12,137,957 
Standby letters of credit405,900 383,851 
Deferred standby letter of credit fees2,176 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
June 30,		Six Months Ended
June 30,
2023202220232022
Beginning balance$54,918 $45,850 $58,593 $50,314 
Credit loss expense (benefit)(2,037)4,396 (5,712)(68)
Ending balance$52,881 $50,246 $52,881 $50,246 
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
June 30,		Six Months Ended
June 30,
2023202220232022
Amortization of lease right-of-use assets$8,747 $8,209 $17,512 $16,314 
Short-term lease expense493 490 902 1,103 
Non-lease components (including taxes, insurance, common maintenance, etc.)3,662 2,748 7,043 5,768 
Total$12,902 $11,447 $25,457 $23,185