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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 58,322	$ 59,486	$ 41,204
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on investment securities	27,568	(14,122)	344
Defined benefit plans	34	1,043	138
Total other comprehensive income (loss), net of tax	27,602	(13,079)	482
Comprehensive income	$ 85,924	$ 46,407	$ 41,686

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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