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Investment Securities - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Proceeds from Sale of Available-for-sale Securities $ 0 $ 10,218 $ 186,769
Proceeds from Sale of Debt Securities, Available-for-sale   10,200 186,800
Available-for-sale Securities, Gross Realized Losses $ 0 0 100
Available-for-sale Securities, Gross Realized Gains   $ 100 $ 100
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Held-to-Maturity Securities, Debt Maturities, Weighted-Average Yield 3.50% 2.50%  
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment $ 45,032 $ 45,032  
Debt Securities, Held-to-maturity, Fair Value $ 45,594 $ 45,564