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Loans Receivable and Allowance for Credit Losses (Accretable Yield for PCI Loans) (Details) - PCD or PCI loans - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Changes in accretable yield for PCI loans    
Accretable yield for PCI loans, beginning of period $ 64,053 $ 74,870
Accretion (6,198) (18,205)
Changes in expected cash flows (934) 256
Accretable yield for PCI loans, end of period $ 56,921 $ 56,921