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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

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