Accumulated Other Comprehensive Loss - Summary of the Tax Effects Allocated to Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Loss
Reclassification adjustment for net gain included in earnings, Before-tax-amount		$ (80)		$ (78)	$ 1,050
Reclassification of other-than-temporary impairment loss included in earnings, Before-tax-amount			$ 1,660		1,723
Reclassification into retained earnings for the adoption of ASU, Before-tax-amount	[1]				932
Total before income taxes		(555)	416	255	1,970
Other comprehensive loss, Tax (expense) or benefit	[2]	135	(105)	(71)	(811)
Total other comprehensive (loss) income, net of tax		(420)	311	184	1,159
Unrealized (loss) gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investments, Net-of-tax amount				628
Reclassification adjustment for net gain included in earnings before-tax amount		(80)		(78)
Reclassification adjustment for net gain included in earnings, Tax (expense) or benefit		19		19
Reclassification adjustment for net gain included in earnings net-of-tax amount		(61)		(59)
Reclassification adjustment for net gain included in earnings, Before-tax-amount					1,050
Reclassification adjustment for net gain included in earnings, Tax (expense) or benefit					(266)
Reclassification adjustment for net gain included in earnings, Net-of-tax amount					784
Reclassification of other-than-temporary impairment loss included in earnings, Before-tax-amount			1,660		1,723
Reclassification adjustment for other-than-temporary impairment loss included in earnings, Tax (expense) or benefit			(421)		(436)
Reclassification adjustment for other-than-temporary impairment loss included in earnings, Net-of-tax amount			1,239		1,287
Total before income taxes			416		1,970
Other comprehensive loss, Tax (expense) or benefit			(105)		(811)
Total other comprehensive (loss) income, net of tax			311	569	1,159
Unrealized (loss) 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) 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) gain, Cash flow hedge, Interest rate swap
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investments, Before-tax amount		(509)		(509)
Unrealized gain (loss) on investments, Tax (expense) or benefit		124		124
Unrealized gain (loss) on investments, Net-of-tax amount		(385)		(385)
Total other comprehensive (loss) income, net of tax				(385)
Unrestricted available-for-sale, Debt securities | Unrealized (loss) gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investments, Before-tax amount		34	(1,244)	824	(1,726)
Unrealized gain (loss) on investments, Tax (expense) or benefit		(8)	316	(210)	438
Unrealized gain (loss) on investments, Net-of-tax amount		$ 26	$ (928)	614	(1,288)
Restricted | Unrealized (loss) gain on available for sale securities
Accumulated Other Comprehensive Loss
Unrealized gain (loss) on investments, Before-tax amount				18	(9)
Unrealized gain (loss) on investments, Tax (expense) or benefit				(4)	2
Unrealized gain (loss) on investments, Net-of-tax amount				$ 14	$ (7)

[1] The reclassification into retained earnings for the nine months ended September 30, 2018 relates to the adoption of Accounting Standards Update (“ASU”) 201601 Financial Instruments - Overall, as amended (“ASU 201601”). 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 condensed consolidated statements of comprehensive income.Income tax expense for the nine months ended September 30, 2018

[2] Income tax expense for the nine months ended September 30, 2018 includes $0.3 million of income tax expense related to the adoption of ASU 201802 Income Statement - Reporting Comprehensive Income (“ASU 201802”). 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 Cuts and Jobs Act (the “Tax Act”).