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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2022
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
June 30,
2022		December 31,
2021
Commitments to extend credit$10,771,940 $10,420,142 
Standby letters of credit327,847 238,690 
Deferred standby letter of credit fees1,890 2,072 
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,
2022202120222021
Beginning balance$45,850 $44,217 $50,314 $44,152 
Credit loss expense (benefit)4,396 4,379 (68)4,444 
Ending balance$50,246 $48,596 $50,246 $48,596 
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,
2022202120222021
Amortization of lease right-of-use assets$8,209 $8,129 $16,314 $16,412 
Short-term lease expense490 530 1,103 734 
Non-lease components (including taxes, insurance, common maintenance, etc.)2,748 2,337 5,768 5,341 
Total$11,447 $10,996 $23,185 $22,487