Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other comprehensive (loss) income, net of tax:
Unrealized net holding (losses) gains arising during the period, pre-tax amounts	$ (5,277)	$ 8,267	$ (434)	$ 16,892
Reclassification adjustment for net gains related to securities available for sale included in net income, pre-tax amounts	26	14	40	21
Amortization of unrealized net gains and losses related to the reclassification of available for sale investment securities to held to maturity, pre-tax amounts	307	0	614	0
Amortization of prior service cost and actuarial gains, pre-tax amounts	$ 561	$ 19	$ 1,122	$ 38