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Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | $ 76,566 | $ 192,171
Less than 12 months, unrealized losses | 175 | 1,084
More than 12 months, fair value | 95,892 | 3,313
More than 12 months, unrealized losses | 572 | 29
Fair Value | 172,458 | 195,484
Unrealized Losses | 747 | 1,113
Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 months, fair value | 856 |
Less than 12 months, unrealized losses | 1 |
More than 12 months, fair value | 0 |
More than 12 months, unrealized losses | 0 |
Fair Value | 856 |
Unrealized Losses | 1 |
U.S. Treasury and government sponsored entities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 74,192 | 180,638
Less than 12 months, unrealized losses | 157 | 1,051
More than 12 months, fair value | 92,878 | 489
More than 12 months, unrealized losses | 551 | 5
Fair Value | 167,070 | 181,127
Unrealized Losses | 708 | 1,056
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 1,344 | 11,533
Less than 12 months, unrealized losses | 7 | 33
More than 12 months, fair value | 3,014 | 1,786
More than 12 months, unrealized losses | 21 | 20
Fair Value | 4,358 | 13,319
Unrealized Losses | 28 | 53
Preferred Stock |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 1,030 | 0
Less than 12 months, unrealized losses | 11 | 0
More than 12 months, fair value | 0 | 1,038
More than 12 months, unrealized losses | 0 | 4
Fair Value | 1,030 | 1,038
Unrealized Losses | 11 | $ 4
Municipal securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 months, fair value | 856 |
Less than 12 months, unrealized losses | 1 |
More than 12 months, fair value | 0 |
More than 12 months, unrealized losses | 0 |
Fair Value | 856 |
Unrealized Losses | $ 1 |

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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 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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