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Investment Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Investment Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds |  |  | $ 0 | $ 5,089 |
Available-for-sale Securities, Gross Realized Losses | $ 0 | $ 0 |  |  |
Available-for-sale Securities, Gross Realized Gains |  |  |  | $ 100 |
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Held-to-Maturity Securities, Debt Maturities, Weighted-Average Yield |  |  | 3.30% |  | 2.50%
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment |  |  | $ 45,032 |  | $ 45,032
Held-to-maturity Securities, Fair Value |  |  | $ 45,875 |  | $ 45,564

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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