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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Securities
Dec. 31, 2019
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months   $ 46
Fair Value, Less Than Twelve Months   24,236
Gross Unrealized Losses, Twelve Months or More   782
Fair Value, Twelve Months or More   66,129
Total Unrealized Losses   $ 828
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 0 9
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 2 19
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 2 28
Auction rate money market preferred [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 0 $ 0
Fair Value, Less Than Twelve Months 0 0
Gross Unrealized Losses, Twelve Months or More 6 81
Fair Value, Twelve Months or More 3,194 3,119
Total Unrealized Losses $ 6 81
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months   3
Fair Value, Less Than Twelve Months   3,974
Gross Unrealized Losses, Twelve Months or More   557
Fair Value, Twelve Months or More   49,701
Total Unrealized Losses   560
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months   43
Fair Value, Less Than Twelve Months   20,262
Gross Unrealized Losses, Twelve Months or More   144
Fair Value, Twelve Months or More   13,309
Total Unrealized Losses   $ 187