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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 14,554	$ 15,193	$ 44,125	$ 43,694
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on investment securities	4,386	(6,072)	27,547	(24,712)
Defined benefit plans	283	217	773	623
Total other comprehensive income (loss), net of tax	4,669	(5,855)	28,320	(24,089)
Comprehensive income	$ 19,223	$ 9,338	$ 72,445	$ 19,605

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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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