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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands | Sep. 30, 2020 USD ($) Securities | Dec. 31, 2019 USD ($) Securities
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months |  | $ 46
Fair Value, Less Than Twelve Months |  | 24,236
Gross Unrealized Losses, Twelve Months or More |  | 782
Fair Value, Twelve Months or More |  | 66,129
Total Unrealized Losses |  | $ 828
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities | 0 | 9
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities | 2 | 19
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities | 2 | 28
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 | 6 | 81
Fair Value, Twelve Months or More | 3,194 | 3,119
Total Unrealized Losses | $ 6 | 81
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months |  | 3
Fair Value, Less Than Twelve Months |  | 3,974
Gross Unrealized Losses, Twelve Months or More |  | 557
Fair Value, Twelve Months or More |  | 49,701
Total Unrealized Losses |  | 560
Collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months |  | 43
Fair Value, Less Than Twelve Months |  | 20,262
Gross Unrealized Losses, Twelve Months or More |  | 144
Fair Value, Twelve Months or More |  | 13,309
Total Unrealized Losses |  | $ 187

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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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=118939692&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + 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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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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