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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 5,548 $ 1,298
Fair Value, Less Than Twelve Months 203,828 164,797
Gross Unrealized Losses, Twelve Months or More 7,548 2,920
Fair Value, Twelve Months or More 140,041 104,610
Total Unrealized Losses $ 13,096 $ 4,218
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 164 81
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 37 24
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 201 105
Government sponsored enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 4 $ 1
Fair Value, Less Than Twelve Months 180 216
Gross Unrealized Losses, Twelve Months or More 0 0
Fair Value, Twelve Months or More 0 0
Total Unrealized Losses 4 1
States and political subdivisions [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 566 142
Fair Value, Less Than Twelve Months 41,972 16,139
Gross Unrealized Losses, Twelve Months or More 0 1
Fair Value, Twelve Months or More 0 188
Total Unrealized Losses 566 143
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 92 151
Fair Value, Twelve Months or More 3,108 3,049
Total Unrealized Losses 92 151
Mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 2,780 454
Fair Value, Less Than Twelve Months 89,602 72,007
Gross Unrealized Losses, Twelve Months or More 5,299 1,896
Fair Value, Twelve Months or More 96,985 76,065
Total Unrealized Losses 8,079 2,350
Collateralized mortgage obligations [Member]    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 2,198 701
Fair Value, Less Than Twelve Months 72,074 76,435
Gross Unrealized Losses, Twelve Months or More 2,157 872
Fair Value, Twelve Months or More 39,948 25,308
Total Unrealized Losses $ 4,355 $ 1,573