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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Changes in balances of each component of accumulated other comprehensive income (loss), net of taxes [Roll Forward]
Beginning Balance			$ 112,983	$ 105,506
Total other comprehensive income (loss), net of tax	$ (2,811)	$ (793)	(8,455)	1,391
Ending Balance	101,667	107,536	101,667	107,536
ASU 2016-01 [Member]
Changes in balances of each component of accumulated other comprehensive income (loss), net of taxes [Roll Forward]
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1, 2018			0
ASU 2018-02 [Member]
Changes in balances of each component of accumulated other comprehensive income (loss), net of taxes [Roll Forward]
Reclassification of certain tax effects from accumulated other comprehensive income at January 1, 2018			0
AOCI Attributable to Parent [Member]
Changes in balances of each component of accumulated other comprehensive income (loss), net of taxes [Roll Forward]
Beginning Balance			9,751	5,830
Total effect of adoption of updated accounting guidance at January 1, 2018			(7,725)
Total other comprehensive income (loss), net of tax			(8,455)	1,391
Ending Balance	$ (6,429)	$ 7,221	(6,429)	$ 7,221
AOCI Attributable to Parent [Member] \| ASU 2016-01 [Member]
Changes in balances of each component of accumulated other comprehensive income (loss), net of taxes [Roll Forward]
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1, 2018			(9,825)
AOCI Attributable to Parent [Member] \| ASU 2018-02 [Member]
Changes in balances of each component of accumulated other comprehensive income (loss), net of taxes [Roll Forward]
Reclassification of certain tax effects from accumulated other comprehensive income at January 1, 2018			2,100
Unrealized Gains on Available-for-Sale Securities [Member]
Changes in balances of each component of accumulated other comprehensive income (loss), net of taxes [Roll Forward]
Other comprehensive loss before reclassifications			(8,208)
Amounts reclassified from accumulated other comprehensive loss			(247)
Total other comprehensive income (loss), net of tax			$ (8,455)