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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
September 30,
2020		December 31,
2019
Commitments to extend credit$9,586,212 $9,306,043 
Standby letters of credit260,683 260,587 
Deferred standby letter of credit fees1,716 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
September 30,		Nine Months Ended
September 30,
2020201920202019
Beginning balance
$46,939 $500 $500 $500 
Impact of adopting ASC 326— — 39,377 — 
Credit loss expense (benefit)(3,276)— 3,786 — 
Ending balance$43,663 $500 $43,663 $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
September 30,		Nine Months Ended
September 30,
2020201920202019
Amortization of lease right-of-use assets
$8,521 $7,415 $24,545 $19,698 
Short-term lease expense172 1,199 1,343 3,316 
Non-lease components (including taxes, insurance, common maintenance, etc.)
2,586 3,114 8,410 7,022 
Total$11,279 $11,728 $34,298 $30,036