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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
March 31,
2021		December 31,
2020
Commitments to extend credit$9,853,069 $9,814,475 
Standby letters of credit261,341 241,345 
Deferred standby letter of credit fees1,711 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
March 31,
20212020
Beginning balance
$44,152 $500 
Impact of adopting ASC 326— 39,377 
Credit loss expense65 2,287 
Ending balance$44,217 $42,164 
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
March 31,
20212020
Amortization of lease right-of-use assets
$8,283 $7,874 
Short-term lease expense204 561 
Non-lease components (including taxes, insurance, common maintenance, etc.)
3,004 2,927 
Total$11,491 $11,362