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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Mar. 31, 2019 USD ($) Securities | Dec. 31, 2018 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ 0 | $ 1,178
Fair Value, Less Than Twelve Months | 132 | 80,103
Gross Unrealized Losses, Twelve Months or More | 4,520 | 7,505
Fair Value, Twelve Months or More | 271,222 | 229,996
Total Unrealized Losses | $ 4,520 | $ 8,683
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities | 1 | 66
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities | 100 | 102
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities | 101 | 168
Government sponsored enterprises [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 | 1 | 2
Fair Value, Twelve Months or More | 165 | 170
Total Unrealized Losses | 1 | 2
States and political subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 | 83
Fair Value, Less Than Twelve Months | 0 | 14,732
Gross Unrealized Losses, Twelve Months or More | 16 | 168
Fair Value, Twelve Months or More | 6,838 | 15,090
Total Unrealized Losses | 16 | 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 | 381 | 646
Fair Value, Twelve Months or More | 2,819 | 2,554
Total Unrealized Losses | 381 | 646
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 | 896
Fair Value, Less Than Twelve Months | 0 | 43,485
Gross Unrealized Losses, Twelve Months or More | 2,843 | 4,384
Fair Value, Twelve Months or More | 163,726 | 124,253
Total Unrealized Losses | 2,843 | 5,280
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | 0 | 199
Fair Value, Less Than Twelve Months | 132 | 21,886
Gross Unrealized Losses, Twelve Months or More | 1,279 | 2,305
Fair Value, Twelve Months or More | 97,674 | 87,929
Total Unrealized Losses | $ 1,279 | $ 2,504

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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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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
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