Comprehensive Income (Loss) AOCI Roll forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive income - beginning balance	$ 10,510
Total other comprehensive income (loss), net	11,683	$ 11,794	$ (1,700)
Accumulated other comprehensive income - ending balance	22,193	10,510
Unrealized gains (losses) on debt securities
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive income - beginning balance	10,510	(1,284)
Total other comprehensive income (loss), net	13,706	11,794
Accumulated other comprehensive income - ending balance	24,216	10,510	(1,284)
Unrealized gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive income - beginning balance	0	0
Total other comprehensive income (loss), net	(2,023)	0
Accumulated other comprehensive income - ending balance	(2,023)	0	0
Total
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated other comprehensive income - beginning balance	10,510	(1,284)
Total other comprehensive income (loss), net	11,683	11,794	(1,700)
Accumulated other comprehensive income - ending balance	$ 22,193	$ 10,510	$ (1,284)