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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 377,227	$ 393,631
Gross unrealized gains	5,853	829
Gross unrealized losses	(785)	(6,115)
Estimated fair value	382,295	388,345
U.S. Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,297	1,999
Gross unrealized gains	13
Gross unrealized losses		(28)
Estimated fair value	2,310	1,971
U.S. Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	6,516	10,370
Gross unrealized gains	84	32
Gross unrealized losses	(2)	(41)
Estimated fair value	6,598	10,361
Municipal Obligations, Tax Exempt [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	152,891	161,529
Gross unrealized gains	2,573	353
Gross unrealized losses	(227)	(2,770)
Estimated fair value	155,237	159,112
Municipal Obligations, Taxable [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	52,606	53,178
Gross unrealized gains	1,170	180
Gross unrealized losses	(11)	(323)
Estimated fair value	53,765	53,035
Agency Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	156,939	158,765
Gross unrealized gains	2,013	264
Gross unrealized losses	(545)	(2,953)
Estimated fair value	158,407	156,076
Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	5,978	7,790
Gross unrealized gains
Gross unrealized losses
Estimated fair value	$ 5,978	$ 7,790

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

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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.

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- Definition

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