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Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Gain (Loss) on Securities [Line Items]        
Debt securities, Gross Realized Gains $ 3,012   $ 3,269  
Debt securities, Gross Realized Losses 2,836   3,028  
Debt securities, Net Gains (Losses) 176   241  
Debt and Equity securities, Gross Realized Gains 3,012   3,269  
Debt and Equity securities, Gross Realized Losses 2,836   3,028  
Debt and Equity securities, Net Gains (Losses) $ 176   $ 241  
Gross Realized Gains   $ 1,530   $ 1,549
Gross Realized Losses   (1,526)   (1,526)
Net Gains   4   23
Equity Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Gross Realized Gains       9
Gross Realized Losses       0
Net Gains       9
Debt Securities [Member]        
Gain (Loss) on Securities [Line Items]        
Gross Realized Gains   1,530   1,540
Gross Realized Losses   (1,526)   (1,526)
Net Gains   $ 4   $ 14