Consolidated Statements of Change in Accumulated Other Comprehensive Income (Loss) - Schedule of Consolidated Statements of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 805,464	$ 794,696	$ 780,935	$ 762,667	$ 750,115
Other comprehensive income (loss), net of tax	(26,394)	(1,277)	(709)	9,685	11,048
Ending balance	793,795	805,464	794,696	780,935	762,667
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(305)			(350)	(366)
Other comprehensive income (loss), net of tax	3,617				16
Ending balance	3,312	(305)			(350)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	18,352			10,698	(334)
Other comprehensive income (loss), net of tax	(30,011)				11,032
Ending balance	(11,659)	18,352			10,698
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	18,047	19,324	20,033	10,348	(700)
Other comprehensive income (loss), net of tax	(26,394)	(1,277)	(709)	9,685	11,048
Ending balance	$ (8,347)	$ 18,047	$ 19,324	$ 20,033	$ 10,348