Comprehensive Income (Loss) (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Unrealized gains on investment securities, before tax [Abstract]
Unrealized holding gains arising during period, before tax				$ 5,107,000	$ 201,000
Less adjustment for impaired investments, before tax				(146,000)
Less adjustment for impaired investments, tax		$ (50,000)		(50,000)
Less adjustment for impaired investments, net of tax	[1]	(96,000)	$ 0	(96,000)	0
Less reclassification adjustment for gains realized in net income, before tax				1,102,000	572,000
Unrealized gains on investment securities, before tax				4,151,000	(371,000)
Unrecognized benefit obligation expense, before tax [Abstract]
Less reclassification adjustment for amortization, before tax				154,000	(34,000)
Unrecognized benefit obligation				(154,000)	(34,000)
Unrealized loss on derivative instrument, before tax				(674,000)	(280,000)
Other comprehensive income net, before tax				3,323,000	(685,000)
Unrealized gains on investment securities, tax [Abstract]
Unrealized holding gains arising during period, tax				1,888,000	71,000
Less reclassification adjustment for gains realized in net income, tax		250,000	130,000	375,000	194,000
Unrealized gains on investment securities, tax				1,563,000	(123,000)
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				(229,000)	(95,000)
Other comprehensive income net, tax				1,334,000	(218,000)
Unrealized gains on investment securities [Abstract]
Unrealized holding gains arising during period, net of tax		886,000	(965,000)	3,219,000	130,000
Less reclassification adjustment for gains realized in net income, net of tax	[2]	485,000	255,000	727,000	378,000
Unrealized gains (losses) on investment securities, net of tax		497,000	(1,220,000)	2,588,000	(248,000)
Unrecognized benefit obligation expense [Abstract]
Less reclassification adjustment for amortization, net of tax	[3]	(51,000)	(17,000)	(154,000)	(34,000)
Unrecognized benefit obligation expense		(51,000)	(17,000)	(154,000)	(34,000)
Unrealized loss on derivative instrument, net of tax		(123,000)	(64,000)	(445,000)	(185,000)
Other comprehensive income (loss)		323,000	$ (1,301,000)	1,989,000	$ (467,000)
Unrecognized benefit obligation		(3,831,000)		(3,831,000)		$ (3,677,000)
Unrealized gains (losses) on AFS investments		2,712,000		2,712,000		124,000
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax		(811,000)		(811,000)		(366,000)
Accumulated other comprehensive loss		$ (1,930,000)		$ (1,930,000)		$ (3,919,000)

[1] Gross amounts are included in total other-than-temporary impairment on AFS investment securities on the Consolidated Statements of Income in total non-interest income, net of $50 thousand in taxes for the three and six months ended June 30, 2016. See Note 15. Comprehensive Income.

[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, net of $250 thousand and $375 thousand in taxes for the three and six months ended June 30, 2016 and $130 thousand and $194 thousand for the three and six months ended June 30, 2015. See Note 15. Comprehensive Income.

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