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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 16,037	$ 14,277
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on investment securities	10,996	(14,971)
Defined benefit plans	242	256
Total other comprehensive income (loss), net of tax	11,238	(14,715)
Comprehensive income (loss)	$ 27,275	$ (438)

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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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