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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
June 30,
2020		December 31,
2019
Commitments to extend credit$9,601,250  $9,306,043  
Standby letters of credit254,142  260,587  
Deferred standby letter of credit fees1,756  1,276  
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,
2020201920202019
Beginning balance
$42,164  $500  $500  $500  
Impact of adopting ASC 326—  —  39,377  —  
Credit loss expense4,775  —  7,062  —  
Ending balance$46,939  $500  $46,939  $500  
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,
2020201920202019
Amortization of lease right-of-use assets
$8,150  $6,487  $16,024  $12,283  
Short-term lease expense610  1,038  1,171  2,117  
Non-lease components (including taxes, insurance, common maintenance, etc.)
2,897  2,175  5,824  3,908  
Total$11,657  $9,700  $23,019  $18,308