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Off-Balance-Sheet Arrangements, Commitments, Guarantees and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments With Off-Balance-Sheet Risk
Year-end financial instruments with off-balance-sheet risk were as follows:
20202019
Commitments to extend credit$9,814,475 $9,306,043 
Standby letters of credit241,345 260,587 
Deferred standby letter of credit fees1,723 1,276 
Commitments, Off-Balance-Sheet, Allowance for Credit Losses
The following table details activity in the allowance for credit losses on off-balance-sheet credit exposures.
202020192018
Beginning balance
$500 $500 $428 
Impact of adopting ASC 32639,377 — — 
Credit loss expense4,275 — 72 
Ending balance$44,152 $500 $500