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Investment Securities (Gross Realized Gains and Losses by Category) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Sale Price $ 0 $ 320,984
Book Value at Sale   316,256
Gross Gains   4,728
Gross Losses   0
FNMA and FHLMC [Member] | Collateralized Mortgage Backed Securities [Member]    
Investments, Debt and Equity Securities [Abstract]    
Sale Price   229,571
Book Value at Sale   227,213
Gross Gains   2,358
Gross Losses   0
GNMA [Member] | Collateralized Mortgage Backed Securities [Member]    
Investments, Debt and Equity Securities [Abstract]    
Sale Price   91,413
Book Value at Sale   89,043
Gross Gains   2,370
Gross Losses   $ 0