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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
June 30,
2021		December 31,
2020
Commitments to extend credit$10,185,687 $9,814,475 
Standby letters of credit210,210 241,345 
Deferred standby letter of credit fees1,814 1,723 
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,
2021202020212020
Beginning balance$44,217 $42,164 $44,152 $500 
Impact of adopting ASC 326— — — 39,377 
Credit loss expense4,379 4,775 4,444 7,062 
Ending balance$48,596 $46,939 $48,596 $46,939 
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,
2021202020212020
Amortization of lease right-of-use assets$8,129 $8,150 $16,412 $16,024 
Short-term lease expense530 610 734 1,171 
Non-lease components (including taxes, insurance, common maintenance, etc.)2,337 2,897 5,341 5,824 
Total$10,996 $11,657 $22,487 $23,019