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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 387,951	$ 393,631
Gross unrealized gains	2,435	829
Gross unrealized losses	(2,994)	(6,115)
Estimated fair value	387,392	388,345
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,296	1,999
Gross unrealized gains
Gross unrealized losses	(15)	(28)
Estimated fair value	2,281	1,971
US Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	6,852	10,370
Gross unrealized gains	52	32
Gross unrealized losses	(19)	(41)
Estimated fair value	6,885	10,361
Municipal Obligations, Tax Exempt [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	160,439	161,529
Gross unrealized gains	1,185	353
Gross unrealized losses	(957)	(2,770)
Estimated fair value	160,667	159,112
Municipal Obligations, Taxable [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	54,184	53,178
Gross unrealized gains	451	180
Gross unrealized losses	(121)	(323)
Estimated fair value	54,514	53,035
Agency Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	156,757	158,765
Gross unrealized gains	747	264
Gross unrealized losses	(1,882)	(2,953)
Estimated fair value	155,622	156,076
Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	7,423	7,790
Gross unrealized gains
Gross unrealized losses
Estimated fair value	$ 7,423	$ 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.

+ References

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- Definition

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- Definition

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