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Loans Receivable and Allowance for Credit Losses (Accretable Yield for PCI Loans) (Details) - PCI Loans - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Changes in accretable yield for PCI loans    
Accretable yield for PCI loans, beginning of period $ 74,870 $ 101,977
Accretion (6,201) (9,134)
Changes in expected cash flows 192 3,021
Accretable yield for PCI loans, end of period $ 68,861 $ 95,864