Stockholders' Equity - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) Vote / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 31, 2017 USD ($)	Jun. 30, 2015 USD ($)
Class of Stock [Line Items]
Tax impact on unrealized losses and gains on investment securities available-for-sale	$ 800,000	$ 100,000	$ 100,000
Payments for repurchase of common stock	$ 100,000,000	$ 0	$ 51,969,000
Common Class A
Class of Stock [Line Items]
Votes per share (in votes) | Vote / shares	1
Voting threshold	24.90%
Reduced voting power	14.90%
Authorized amount					$ 150,000,000
Additional authorized amount				$ 150,000,000
Remaining authorized amount	$ 50,000,000