Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax effect	$ (6,186)	$ (1,708)
Total accumulated other comprehensive income	23,278	6,432
Unrealized gain on securities available for sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), before tax	38,530	12,687
Unamortized loss on securities held to maturity, previously transferred from AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), before tax	(167)	(107)
Unrealized loss on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), before tax	$ (8,899)	$ (4,440)