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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments with Off-Balance-Sheet Risk
Financial instruments with off-balance-sheet risk were as follows:
September 30,
2021		December 31,
2020
Commitments to extend credit$10,262,077 $9,814,475 
Standby letters of credit225,311 241,345 
Deferred standby letter of credit fees1,935 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
September 30,		Nine Months Ended
September 30,
2021202020212020
Beginning balance$48,596 $46,939 $44,152 $500 
Impact of adopting ASC 326— — — 39,377 
Credit loss expense3,023 (3,276)7,467 3,786 
Ending balance$51,619 $43,663 $51,619 $43,663 
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,
2021202020212020
Amortization of lease right-of-use assets$8,172 $8,521 $24,584 $24,545 
Short-term lease expense384 172 1,118 1,343 
Non-lease components (including taxes, insurance, common maintenance, etc.)2,864 2,586 8,205 8,410 
Total$11,420 $11,279 $33,907 $34,298