Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Mortgage loans held for sale	$ 58,500	$ 18,900
Mortgage loans held for sale, outstanding principal balance	56,600	18,200
Net gains (losses) from changes in fair value of loans	$ 1,180	$ (133)	$ 505
Percentage of written down in appraisal value of nonaccrual impaired loans	80.00%
Maximum remaining maturity of financial instruments having no defined maturity	180 days