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Loans Receivable and Allowance for Credit Losses (Details 13) - Loans Receivable - PCI Loans - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Changes in accretable yield for PCI loans    
Beginning balance $ 136,247 $ 214,907
Accretion (10,279) (22,429)
Changes in expected cash flows 2,022 (6,487)
Ending balance $ 127,990 $ 185,991