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Investment Securities, Held-to-maturity Securities, Gross Unrealized Loss Position (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Fair Value [Abstract]      
Less than 12 months - Fair Value $ 9,539    
12 months or more - Fair Value 0    
Total - Fair Value 9,539    
Gross Unrealized Loss [Abstract]      
Less than 12 months - Gross Unrealized Loss 62    
12 months or more - Gross Unrealized Loss 0    
Total - Gross Unrealized Loss 62   $ 0
Sales and transfers of held to maturity securities 0 $ 0  
Mortgage Backed Securities and Collateralized Mortgage Obligations-Residential [Member]      
Fair Value [Abstract]      
Less than 12 months - Fair Value 9,539    
12 months or more - Fair Value 0    
Total - Fair Value 9,539    
Gross Unrealized Loss [Abstract]      
Less than 12 months - Gross Unrealized Loss 62    
12 months or more - Gross Unrealized Loss 0    
Total - Gross Unrealized Loss $ 62