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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 8,326	$ 16,037
Other comprehensive income, net of tax:
Net change in unrealized gain on investment securities	10,147	10,996
Defined benefit plans	516	242
Total other comprehensive income, net of tax	10,663	11,238
Comprehensive income	$ 18,989	$ 27,275

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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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