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Off-Balance-Sheet Arrangements, Commitments, Guarantees and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Financial Instruments With Off-Balance-Sheet Risk
Year-end financial instruments with off-balance-sheet risk are presented in the following table. Commitments and standby letters of credit are presented at contractual amounts; however, since many of these commitments are expected to expire unused or only partially used, the total amounts of these commitments do not necessarily reflect future cash requirements.
20212020
Commitments to extend credit$10,420,142 $9,814,475 
Standby letters of credit238,690 241,345 
Deferred standby letter of credit fees2,072 1,723 
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.
202120202019
Beginning balance
$44,152 $500 $500 
Impact of adopting ASC 326— 39,377 — 
Credit loss expense6,162 4,275 — 
Ending balance$50,314 $44,152 $500