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Investment Securities, Held-to-maturity Securities, Gross Unrealized Loss Position (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair Value [Abstract]          
Less than 12 months - Fair Value $ 12,072   $ 12,072    
12 months or more - Fair Value 0   0    
Total - Fair Value 12,072   12,072    
Gross Unrealized Loss [Abstract]          
Less than 12 months - Gross Unrealized Loss 127   127    
12 months or more - Gross Unrealized Loss 0   0    
Total - Gross Unrealized Loss 127   127   $ 0
Sales and transfers of held to maturity securities 0 $ 0 0 $ 0  
Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]          
Fair Value [Abstract]          
Less than 12 months - Fair Value 12,072   12,072    
12 months or more - Fair Value 0   0    
Total - Fair Value 12,072   12,072    
Gross Unrealized Loss [Abstract]          
Less than 12 months - Gross Unrealized Loss 127   127    
12 months or more - Gross Unrealized Loss 0   0    
Total - Gross Unrealized Loss $ 127   $ 127