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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Securities
Dec. 31, 2018
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 46 $ 1,178
Fair Value, Less Than Twelve Months 24,236 80,103
Gross Unrealized Losses, Twelve Months or More 782 7,505
Fair Value, Twelve Months or More 66,129 229,996
Total Unrealized Losses $ 828 $ 8,683
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 9 66
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 19 102
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 28 168
Government sponsored enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months   $ 0
Fair Value, Less Than Twelve Months   0
Gross Unrealized Losses, Twelve Months or More   2
Fair Value, Twelve Months or More   170
Total Unrealized Losses   2
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 0 83
Fair Value, Less Than Twelve Months 0 14,732
Gross Unrealized Losses, Twelve Months or More 0 168
Fair Value, Twelve Months or More 0 15,090
Total Unrealized Losses 0 251
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 81 646
Fair Value, Twelve Months or More 3,119 2,554
Total Unrealized Losses 81 646
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 3 896
Fair Value, Less Than Twelve Months 3,974 43,485
Gross Unrealized Losses, Twelve Months or More 557 4,384
Fair Value, Twelve Months or More 49,701 124,253
Total Unrealized Losses 560 5,280
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 43 199
Fair Value, Less Than Twelve Months 20,262 21,886
Gross Unrealized Losses, Twelve Months or More 144 2,305
Fair Value, Twelve Months or More 13,309 87,929
Total Unrealized Losses $ 187 $ 2,504