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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 387,875 | $ 387,733
Gross unrealized gains | 3,276 | 2,038
Gross unrealized losses | (1,763) | (4,208)
Estimated fair value | 389,388 | 385,563
Common Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 162 | 458
Gross unrealized gains | 161 | 650
Gross unrealized losses |  |
Estimated fair value | 323 | 1,108
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,997 | 6,005
Gross unrealized gains | 17 | 10
Gross unrealized losses |  |
Estimated fair value | 5,014 | 6,015
US Federal Agency Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 20,354 | 27,140
Gross unrealized gains | 29 | 48
Gross unrealized losses | (40) | (49)
Estimated fair value | 20,343 | 27,139
Municipal Obligations Tax Exempt [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 179,116 | 163,632
Gross unrealized gains | 2,236 | 696
Gross unrealized losses | (781) | (2,666)
Estimated fair value | 180,571 | 161,662
Municipal Obligations Taxable [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 59,610 | 71,371
Gross unrealized gains | 636 | 463
Gross unrealized losses | (92) | (271)
Estimated fair value | 60,154 | 71,563
Agency Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 114,412 | 109,427
Gross unrealized gains | 197 | 171
Gross unrealized losses | (850) | (1,222)
Estimated fair value | 113,759 | 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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