Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2021		Sep. 30, 2020		Sep. 30, 2021		Sep. 30, 2020		Dec. 31, 2019		Jun. 30, 2021		Dec. 31, 2020		Jun. 30, 2020
Purchase of treasury stock (in shares)							131,035
Common stock, dividends price per share (in usd per share)	$ 0.135		$ 0.125		$ 0.395		$ 0.375
Accounting Standards Update [Extensible List]									Accounting Standards Update 2016-13 [Member]
Stockholders' equity	$ (814,128)		$ (753,572)		$ (814,128)		$ (753,572)		$ (725,263)		$ (796,676)		$ (763,784)		$ (745,489)
Retained Earnings
Stockholders' equity	$ (244,092)	[1],[2]	$ (182,329)	[1],[2]	$ (244,092)	[1],[2]	$ (182,329)	[1],[2]	(162,752)	[2]	$ (228,803)	[1]	$ (191,418)	[2]	$ (174,267)	[1]
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Stockholders' equity									$ 3,395

[1] The Company adopted ASU 2016-13 at December 31, 2020, effective January 1, 2020, adjusting Retained Earnings by a negative $3,395. Prior year periods have not been restated.

[2] The Company adopted ASU 2016-13 at December 31, 2020, effective January 1, 2020, adjusting Retained Earnings by a negative $3,395. Retained earnings for the nine months ended September 30, 2020 have not been restated.