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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 Comprehensive Income [Abstract]
Net income	$ 6,859	$ 14,554	$ 25,102	$ 44,125
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on investment securities	(2,257)	4,386	14,165	27,547
Defined benefit plans	247	283	967	773
Total other comprehensive income (loss), net of tax	(2,010)	4,669	15,132	28,320
Comprehensive income	$ 4,849	$ 19,223	$ 40,234	$ 72,445

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