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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Securities
Dec. 31, 2018
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 52 $ 1,178
Fair Value, Less Than Twelve Months 18,052 80,103
Gross Unrealized Losses, Twelve Months or More 966 7,505
Fair Value, Twelve Months or More 86,835 229,996
Total Unrealized Losses $ 1,018 $ 8,683
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 10 66
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 23 102
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 33 168
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 $ 1 83
Fair Value, Less Than Twelve Months 797 14,732
Gross Unrealized Losses, Twelve Months or More 0 168
Fair Value, Twelve Months or More 0 15,090
Total Unrealized Losses 1 251
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 111 646
Fair Value, Twelve Months or More 3,089 2,554
Total Unrealized Losses 111 646
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 4 896
Fair Value, Less Than Twelve Months 5,943 43,485
Gross Unrealized Losses, Twelve Months or More 694 4,384
Fair Value, Twelve Months or More 66,703 124,253
Total Unrealized Losses 698 5,280
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 47 199
Fair Value, Less Than Twelve Months 11,312 21,886
Gross Unrealized Losses, Twelve Months or More 161 2,305
Fair Value, Twelve Months or More 17,043 87,929
Total Unrealized Losses $ 208 $ 2,504