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Loans Receivable and Allowance for Credit Losses (Accretable Yield for PCI Loans) (Details) - PCI Loans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in the accretable yield for the PCI loans      
Accretable yield for PCI loans, beginning of period $ 74,870 $ 101,977 $ 136,247
Accretion (24,220) (34,662) (42,487)
Changes in expected cash flows (140) 7,555 8,217
Accretable yield for PCI loans, ending of period $ 50,510 $ 74,870 $ 101,977