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AFS Securities (AFS securities with gross unrealized losses) (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 5,152 $ 1,298
Fair Value, Less Than Twelve Months 250,665 164,797
Gross Unrealized Losses, Twelve Months or More 4,503 2,920
Fair Value, Twelve Months or More 99,012 104,610
Total Unrealized Losses $ 9,655 $ 4,218
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities 151 81
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities 24 24
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities 175 105
Government sponsored enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ 3 $ 1
Fair Value, Less Than Twelve Months 202 216
Gross Unrealized Losses, Twelve Months or More 0 0
Fair Value, Twelve Months or More 0 0
Total Unrealized Losses 3 1
States and political subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 395 142
Fair Value, Less Than Twelve Months 32,838 16,139
Gross Unrealized Losses, Twelve Months or More 0 1
Fair Value, Twelve Months or More 150 188
Total Unrealized Losses 395 143
Auction rate money market preferred [Member]    
Schedule of Available-for-sale Securities [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 188 151
Fair Value, Twelve Months or More 3,012 3,049
Total Unrealized Losses 188 151
Mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 2,756 454
Fair Value, Less Than Twelve Months 121,210 72,007
Gross Unrealized Losses, Twelve Months or More 3,199 1,896
Fair Value, Twelve Months or More 71,928 76,065
Total Unrealized Losses 5,955 2,350
Collateralized mortgage obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 1,998 701
Fair Value, Less Than Twelve Months 96,415 76,435
Gross Unrealized Losses, Twelve Months or More 1,116 872
Fair Value, Twelve Months or More 23,922 25,308
Total Unrealized Losses $ 3,114 $ 1,573