Fair Value Measurements - Schedule of Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - Level 3 - State tax credits held for sale, at fair value - Recurring basis - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Level 3 Financial Instruments Measured at Fair Value
Beginning balance	$ 0	$ 350	$ 0	$ 400
Total gains:
Total gains:	0	3	0	6
Purchases, sales, issuances and settlements:
Sales	0	(54)	0	(107)
Ending balance	0	299	0	299
Change in unrealized gains relating to assets still held at the reporting date	$ 0	$ (13)	$ 0	$ (26)