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Loans and Lease Receivables - Summary of Changes in Accretable Yield for Acquired Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]      
Beginning balance $ 37,115 $ 36,446 $ 36,868
Additions 9,764 3,566  
Accretion to interest income (24,535) (23,982) (24,597)
Reclassification from nonaccretable difference 17,665 21,085 24,175
Ending balance $ 40,009 $ 37,115 $ 36,446