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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

X

- 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
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-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

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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
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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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
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
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