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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 15,390	$ 5,853	$ 24,873	$ 20,144
Change in unrealized gain (loss) on investments:
Net unrealized gains arising during the period	247	447	56	4,777
Credit losses charged to income	70	0	596	0
Call and repayment gains charged to investment income	(15)	(2)	(231)	(1)
Reclassification adjustment for net realized losses (gains)	21	(26)	(1,133)	(59)
Net change in unrealized gains (losses)	323	419	(712)	4,717
Deferred income taxes on above change	(79)	(83)	174	(1,173)
Total other comprehensive income (loss), net of income taxes	244	336	(538)	3,544
Comprehensive income	$ 15,634	$ 6,189	$ 24,335	$ 23,688

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