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Contingencies (Tables)
 3 Months Ended
Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]  
Summary of Changes in ACL on Off-balance Sheet Credit Exposures

Changes in the ACL on off-balance sheet credit exposures were as follows for the periods presented ($ in thousands):

 

 

 

Three Months Ended March 31,

 

 

 

2021

 

 

2020

 

Balance at beginning of period

 

$

38,572

 

 

$

—

 

FASB ASU 2016-13 adoption adjustment

 

 

—

 

 

 

29,638

 

Credit loss expense related to off-balance sheet credit exposures

 

 

(9,367

)

 

 

6,783

 

Balance at end of period

 

$

29,205

 

 

$

36,421