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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Investment Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Available-for-sale Securities, Gross Realized Losses $ 0 $ 0  
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 2.80%   2.50%
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment $ 45,032   $ 45,032
Held-to-maturity Securities, Fair Value $ 46,363   $ 45,564