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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 15,193	$ 11,812	$ 43,694	$ 36,916
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on investment securities	(6,072)	(293)	(24,712)	4,626
Defined benefit plans	217	285	623	111
Total other comprehensive income (loss), net of tax	(5,855)	(8)	(24,089)	4,737
Comprehensive income	$ 9,338	$ 11,804	$ 19,605	$ 41,653

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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