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Borrowings - Maturities of FHLB Borrowings (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 $ 220,000  
2020 185,000  
2021 145,000  
2022 145,000  
Total $ 695,000 $ 821,280