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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

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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