Stockholders' Equity (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Unrealized Gain (Loss) on Securities
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning	[1]	$ (591)	$ 214
Other comprehensive (loss) income, before reclassifications	[1]	2,006	781
Amounts reclassified from accumulated other comprehensive income	[1]	(472)	0
Current period other comprehensive income, before tax	[1]	1,534	781
Income tax expense	[1]	(583)	(297)
Current period other comprehensive income, net of tax	[1]	951	484
Balance at the end	[1]	360	698
Unrecognized Net Pension and Postretirement Costs
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning	[2]	(1,427)	(1,442)
Other comprehensive (loss) income, before reclassifications	[2]	21	0
Amounts reclassified from accumulated other comprehensive income	[2]	0	36
Current period other comprehensive income, before tax	[2]	21	36
Income tax expense	[2]	(8)	(13)
Current period other comprehensive income, net of tax	[2]	13	23
Balance at the end	[2]	(1,414)	(1,419)
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning		(2,018)	(1,228)
Other comprehensive (loss) income, before reclassifications		2,027	781
Amounts reclassified from accumulated other comprehensive income		(472)	36
Current period other comprehensive income, before tax		1,555	817
Income tax expense		(591)	(310)
Current period other comprehensive income, net of tax		964	507
Balance at the end		(1,054)	(721)
Balance at the beginning		(2,018)
Current period other comprehensive income, net of tax		964	$ 507
Balance at the end		$ (1,054)

[1] The pre-tax amounts reclassified from accumulated other comprehensive income (loss) are included in gain on sale of investment securities in the consolidated statements of income.

[2] The pre-tax amounts reclassified from accumulated other comprehensive income (loss) are included in the computation of net periodic pension cost.