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