Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of changes in accumulated other comprehensive loss
Beginning Balance	$ 529,670	$ 533,111	$ 592,584
Amounts reclassified from accumulated other comprehensive loss	(3)	(52)
Total other comprehensive (loss) income, net of tax	(1,137)	339	787
Ending Balance	568,170	529,670	533,111
Accumulated Other Comprehensive Loss.
Summary of changes in accumulated other comprehensive loss
Beginning Balance	(335)	(674)	(1,461)
Other comprehensive income (loss) before reclassifications	(1,134)	391
Amounts reclassified from accumulated other comprehensive loss	(3)	(52)
Total other comprehensive (loss) income, net of tax	(1,137)	339
Ending Balance	(1,472)	(335)	(674)
Unrealized (loss) and gain on available for sale securities
Summary of changes in accumulated other comprehensive loss
Beginning Balance	(84)	(674)
Other comprehensive income (loss) before reclassifications	103	642
Amounts reclassified from accumulated other comprehensive loss	(3)	(52)
Total other comprehensive (loss) income, net of tax	100	590
Ending Balance	16	(84)	$ (674)
Unrealized loss Cash flow hedge, Interest rate swap
Summary of changes in accumulated other comprehensive loss
Beginning Balance	(251)
Other comprehensive income (loss) before reclassifications	(1,237)	(251)
Total other comprehensive (loss) income, net of tax	(1,237)	(251)
Ending Balance	$ (1,488)	$ (251)