Accumulated Other Comprehensive Loss - Summary of the Tax Effects Allocated to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Loss
Reclassification adjustment for net gain included in earnings, Before-tax-amount		$ (69)	$ 1,061	$ (10,750)
Reclassification adjustment for net gain included in earnings, Tax (expense) or benefit		17
Reclassification adjustment for net gain included in earnings, Net-of-tax amount		(52)
Reclassification of other-than-temporary impairment loss included in earnings, Before-tax-amount			2,330	2,288
Reclassification into retained earnings for the adoption of ASU, Before-tax-amount	[1]		932
Total before income taxes		455	1,472	(6,456)
Other comprehensive loss, Tax (expense) or benefit	[2]	(116)	(685)	2,488
Total other comprehensive (loss) income, net of tax		339	787	$ (3,968)
Unrealized (loss) and gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investments, Net-of-tax amount		642	(2,127)
Amounts reclassified from accumulated other comprehensive loss		(52)	2,914
Reclassification adjustment for net gain included in earnings, Before-tax-amount			1,061
Reclassification adjustment for net gain included in earnings, Tax (expense) or benefit			(269)
Reclassification adjustment for net gain included in earnings, Net-of-tax amount			792
Reclassification of other-than-temporary impairment loss included in earnings, Before-tax-amount			2,330
Reclassification adjustment for other-than-temporary impairment loss included in earnings, Tax (expense) or benefit			(592)
Reclassification adjustment for other-than-temporary impairment loss included in earnings, Net-of-tax amount			1,738
Total before income taxes			1,472
Other comprehensive loss, Tax (expense) or benefit			(685)
Total other comprehensive (loss) income, net of tax		590	787
Unrealized (loss) and gain on available for sale securities | ASU 2016-01
Accumulated Other Comprehensive Loss
Reclassification into retained earnings for the adoption of ASU, Before-tax-amount			932
Reclassification into retained earnings for the adoption of ASU, Tax (expense) or benefit			(236)
Reclassification into retained earnings for the adoption of ASU, Net-of-tax amount			696
Unrealized (loss) and gain on available for sale securities | ASU 2018-02
Accumulated Other Comprehensive Loss
Reclassification into retained earnings for the adoption of ASU, Tax (expense) or benefit			(313)
Reclassification into retained earnings for the adoption of ASU, Net-of-tax amount			(313)
Unrealized loss Cash flow hedge, Interest rate swap
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investments, Before-tax amount		(336)
Unrealized gain (loss) on investments, Tax (expense) or benefit		85
Unrealized gain (loss) on investments, Net-of-tax amount		(251)
Total other comprehensive (loss) income, net of tax		(251)
Unrestricted available-for-sale, Debt securities | Unrealized (loss) and gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investments, Before-tax amount		842	(2,845)
Unrealized gain (loss) on investments, Tax (expense) or benefit		(214)	723
Unrealized gain (loss) on investments, Net-of-tax amount		628	(2,122)
Restricted | Unrealized (loss) and gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investments, Before-tax amount		18	(6)
Unrealized gain (loss) on investments, Tax (expense) or benefit		(4)	2
Unrealized gain (loss) on investments, Net-of-tax amount		$ 14	$ (4)

[1] The reclassification into retained earnings for the year ended December 31, 2018 relates to the adoption of ASU 2016-01 Financial Instruments - Overall, as amended (“ASU 2016-01”). The new guidance was effective January 1, 2018, and required equity investments to be measured at fair value with changes in fair value recognized in results of operations rather than the consolidated statements of comprehensive income.

[2] Income tax expense for the year ended December 31, 2018 includes $0.3 million of income tax expense related to the adoption of ASU 2018-02 Income Statement - Reporting Comprehensive Income (“ASU 2018-02”). The new guidance was effective January 1, 2018, and allowed a reclassification from accumulated other comprehensive loss to retained earnings for stranded tax effects resulting from the Tax Act.