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Mortgage Banking Operations - MSR Projected Amortization (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Projected Amortization Expense [Abstract]            
Remainder of 2018 $ 1,845          
2019 3,626          
2020 3,557          
2021 3,357          
2022 3,046          
2023 and thereafter 11,029          
Carrying value of multifamily MSR 26,460 $ 26,042 $ 26,093 $ 21,600 $ 21,424 $ 19,747
Multifamily originations [Member]            
Projected Amortization Expense [Abstract]            
Carrying value of multifamily MSR $ 26,460