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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 387,317 | $ 387,733
Gross unrealized gains | 3,931 | 2,038
Gross unrealized losses | (1,406) | (4,208)
Estimated fair value | 389,842 | 385,563
Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 178 | 458
Gross unrealized gains | 181 | 650
Gross unrealized losses |  |
Estimated fair value | 359 | 1,108
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,993 | 6,005
Gross unrealized gains | 24 | 10
Gross unrealized losses | (1) |
Estimated fair value | 5,016 | 6,015
US Federal Agency Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 21,377 | 27,140
Gross unrealized gains | 45 | 48
Gross unrealized losses | (40) | (49)
Estimated fair value | 21,382 | 27,139
Municipal Obligations Tax Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 177,419 | 163,632
Gross unrealized gains | 2,485 | 696
Gross unrealized losses | (661) | (2,666)
Estimated fair value | 179,243 | 161,662
Municipal Obligations Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 62,031 | 71,371
Gross unrealized gains | 828 | 463
Gross unrealized losses | (81) | (271)
Estimated fair value | 62,778 | 71,563
Agency Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 112,095 | 109,427
Gross unrealized gains | 368 | 171
Gross unrealized losses | (623) | (1,222)
Estimated fair value | 111,840 | 108,376
Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 9,224 | 9,700
Gross unrealized gains |  |
Gross unrealized losses |  |
Estimated fair value | $ 9,224 | $ 9,700

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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