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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Changes in accretable yield for PCI loans        
Accretable yield for PCI loans, beginning of period $ 68,861 $ 95,864 $ 74,870 $ 101,977
Accretion (5,806) (11,084) (12,007) (20,218)
Changes in expected cash flows 998 272 1,190 3,293
Accretable yield for PCI loans, end of period $ 64,053 $ 85,052 $ 64,053 $ 85,052