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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 14,277	$ 13,079
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on investment securities	(14,971)	2,124
Minimum pension liability adjustment	256	(364)
Total other comprehensive income (loss), net of tax	(14,715)	1,760
Comprehensive income (loss)	$ (438)	$ 14,839

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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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