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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 18,714	$ 9,917	$ 36,752	$ 18,243
Other comprehensive income, net of tax:
Net change in unrealized gain (loss) on investment securities	1,727	6,275	(15,574)	16,422
Defined benefit plans	188	204	372	720
Total other comprehensive income (loss), net of tax	1,915	6,479	(15,202)	17,142
Comprehensive income	$ 20,629	$ 16,396	$ 21,550	$ 35,385

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