Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Unrealized gains on investment securities, before tax [Abstract]
Unrealized holding gains arising during period, before tax				$ 201	$ 6,713
Less reclassification adjustment for gains realized in net income, before tax				572	92
Unrealized gains on investment securities, before tax				(371)	6,621
Unrecognized benefit obligation expense, before tax [Abstract]
Less reclassification adjustment for amortization, before tax				(34)	(57)
Unrecognized benefit obligation				(34)	57
Unrealized loss on derivative instrument, before tax				(280)
Other comprehensive income net, before tax				(685)	6,678
Unrealized gains on investment securities, tax [Abstract]
Unrealized holding gains arising during period, tax				71	2,164
Less reclassification adjustment for gains realized in net income, tax				194	31
Unrealized gains on investment securities, tax				(123)	2,133
Unrecognized benefit obligation expense, tax [Abstract]
Less reclassification adjustment for amortization, tax					(19)
Unrecognized benefit obligation, tax					19
Unrealized loss on derivative instrument, tax				(95)
Other comprehensive income net, tax				(218)	2,152
Unrealized gains on investment securities [Abstract]
Unrealized holding gains arising during period, net of tax		$ (965)	$ 2,352	130	4,549
Less reclassification adjustment for gains realized in net income, net of tax	[1]	255	61	378	61
Unrealized gains (losses) on investment securities, net of tax		(1,220)	2,291	(248)	4,488
Unrecognized benefit obligation expense [Abstract]
Less reclassification adjustment for amortization, net of tax	[2]	(17)	(20)	(34)	(38)
Unrecognized benefit obligation expense		17	20	34	38
Unrealized loss on derivative instrument, net of tax		(64)		(185)
Other comprehensive income (loss)		$ (1,301)	$ 2,311	$ (467)	$ 4,526

[1] Gross amounts are included in net gains on the sale of AFS investment securities on the Consolidated Statements of Income. See Note 15. C

[2] Gross amounts are included in salaries and benefits on the Consolidated Statements of Income. See Note 15. Comprehensive Income (Loss).