Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Unrealized gains on investment securities, before tax [Abstract]
Unrealized holding gains arising during period, before tax		$ 958	$ 3,562
Less reclassification adjustment for gains realized in net income, before tax			367
Unrealized gains on investment securities, before tax		958	3,195
Unrecognized benefit obligation expense, before tax [Abstract]
Less reclassification adjustment for amortization, before tax		(13)	(103)
Unrecognized benefit obligation		13	(103)
Unrealized loss on derivative instrument, before tax		68	(488)
Other comprehensive income net, before tax		1,039	2,604
Unrealized gains on investment securities, tax [Abstract]
Unrealized holding gains arising during period, tax		326	1,229
Less reclassification adjustment for gains realized in net income, tax			125
Unrealized gains on investment securities, tax		326	1,104
Unrecognized benefit obligation expense, tax [Abstract]
Less reclassification adjustment for amortization, tax		0	0
Unrecognized benefit obligation, tax		0	0
Unrealized loss on derivative instrument, tax		(23)	166
Other comprehensive income net, tax		349	938
Unrealized gains on investment securities [Abstract]
Unrealized holding gains arising during period, net of tax	[1]	632	2,333
Less reclassification adjustment for gains realized in net income, net of tax	[2]	0	242
Unrealized gains (losses) on investment securities, net of tax		632	2,091
Unrecognized benefit obligation expense [Abstract]
Less reclassification adjustment for amortization, net of tax	[3]	13	(103)
Unrecognized benefit obligation expense		13	(103)
Unrealized loss on derivative instrument, net of tax	[4]	45	(322)
Other comprehensive income (loss)		690	$ 1,666
Unrecognized benefit obligation		(4,125)		$ (4,138)
Unrealized loss on AFS investments		(123)		(755)
Unrealized loss on derivative instrument		(281)		(326)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total		$ (4,529)		$ (5,219)

[1] Net of $326 thousand and $1.2 million in tax expense for the three months ended March 31, 2017 and 2016, respectively.

[2] Gross amounts are included in net gains on the sale of AFS investment securities on the Consolidated Statements of Income in total non-interest income; amounts in the above table are net of $125 thousand in income taxes for the three months ended March 31, 2016. See Note 14. Comprehensive Income.

[3] Gross amounts are included in salaries and benefits on the Consolidated Statements of Income in non-interest expense.

[4] Net of $23 thousand in tax expense and $166 thousand tax benefit for the three months ended March 31, 2017 and 2016, respectively.