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Mortgage Banking Operations - MSR Projected Amortization (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Projected Amortization Expense [Abstract]        
Remainder of 2018 $ 2,707      
2019 3,514      
2020 3,441      
2021 3,232      
2022 2,913      
2023 and thereafter 10,235      
Carrying value of multifamily MSR 26,042 $ 26,093 $ 21,424 $ 19,747
Multifamily originations [Member]        
Projected Amortization Expense [Abstract]        
Carrying value of multifamily MSR $ 26,042