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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Investment Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds     $ 0 $ 5,089  
Available-for-sale Securities, Gross Realized Losses $ 0 $ 0      
Available-for-sale Securities, Gross Realized Gains       $ 100  
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Held-to-Maturity Securities, Debt Maturities, Weighted-Average Yield     3.30%   2.50%
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment     $ 45,032   $ 45,032
Held-to-maturity Securities, Fair Value     $ 45,875   $ 45,564