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Loans Receivable and Allowance for Loan Losses - Accretable Yield Movement Schedule on Acquired Credit Impaired Loans in Center Merger (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]        
Balance at beginning of period $ 47,364 $ 54,846 $ 49,697 $ 55,002
Accretion (6,848) (5,959) (12,682) (11,731)
Reclassification from nonaccretable difference 2,846 4,686 6,347 10,302
Balance at end of period $ 43,362 $ 53,573 $ 43,362 $ 53,573