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Investment Securities - Summary of Available for Sale Securities With Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Schedule Of Available For Sale Securities [Line Items] |  |
Less than Twelve Months Unrealized Losses | $ (415) | $ (422)
Less than Twelve Months Estimated Fair Value | 37,867 | 26,695
Twelve Months or More Unrealized Losses | (63) | (90)
Twelve Months or More Estimated Fair Value | 2,105 | 2,504
Total Unrealized Losses | (478) | (512)
Total Estimated Fair Value | 39,972 | 29,199
Government Agency Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than Twelve Months Unrealized Losses | (100) | (136)
Less than Twelve Months Estimated Fair Value | 4,957 | 5,317
Total Unrealized Losses | (100) | (136)
Total Estimated Fair Value | 4,957 | 5,317
Government Sponsored Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than Twelve Months Unrealized Losses | (255) | (221)
Less than Twelve Months Estimated Fair Value | 26,916 | 16,231
Twelve Months or More Unrealized Losses | (63) | (90)
Twelve Months or More Estimated Fair Value | 2,105 | 2,504
Total Unrealized Losses | (318) | (311)
Total Estimated Fair Value | 29,021 | 18,735
Corporate Debt Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Less than Twelve Months Unrealized Losses | (60) | (65)
Less than Twelve Months Estimated Fair Value | 5,994 | 5,147
Total Unrealized Losses | (60) | (65)
Total Estimated Fair Value | $ 5,994 | $ 5,147

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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