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Comprehensive Income - Other Comprehensive Income (Loss) and Related Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Unrealized gain (loss) on investment securities available-for-sale	$ (510)	$ 4,343	$ (3,882)
Net gain on the sale of investment securities available-for-sale	(1,189)	(861)	(163)
Amortization of actuarial loss (gain)	198	92	276
Actuarial (loss) gain	(494)	(3,776)	3,366
Net change in benefit plan liabilities	(296)	(3,684)	3,642
Other comprehensive loss	(1,995)	(202)	(403)
Income tax expense (benefit)	(699)	(71)	5
Other comprehensive income (loss)	$ (1,296)	$ (131)	$ (408)

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification.

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