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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							9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 817,073	$ 793,795	$ 805,464	$ 794,696	$ 780,935	$ 762,667	$ 750,115	$ 805,464	$ 750,115
Other comprehensive income (loss), net of tax	(5,691)	8,524	(26,394)	(1,277)	(709)	9,685	11,048	(23,561)	20,024
Ending balance	824,418	817,073	793,795	805,464	794,696	780,935	762,667	824,418	794,696
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			(305)	(320)			(366)	(305)	(366)
Other comprehensive income (loss), net of tax								1,211	46
Ending balance	906			(305)	(320)			906	(320)
Unrealized Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			18,352	19,644			(334)	18,352	(334)
Other comprehensive income (loss), net of tax								(24,772)	19,978
Ending balance	(6,420)			18,352	19,644			(6,420)	19,644
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	177	(8,347)	18,047	19,324	20,033	10,348	(700)	18,047	(700)
Other comprehensive income (loss), net of tax	(5,691)	8,524	(26,394)	(1,277)	(709)	9,685	11,048	(23,561)	20,024
Ending balance	$ (5,514)	$ 177	$ (8,347)	$ 18,047	$ 19,324	$ 20,033	$ 10,348	$ (5,514)	$ 19,324

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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