Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Securities:
Unrealized holding gains on securities, Pre-Tax	$ 1,402	$ 1,269	$ 7,864	$ (9,864)
Non-credit related portion of other-than-temporary impairment on securities, Pre-Tax	0	0	0	0
Reclassification adjustment for losses realized in net income, Pre-Tax	(375)	0	(375)	115
Amortization of unrealized holding gains on securities transferred to the held to maturity category, Pre-Tax	(61)	(80)	(196)	(274)
Total securities available for sale, Pre-Tax	966	1,189	7,293	(10,023)
Unrealized holding gains on securities, Tax Expense (Benefit)	536	487	3,008	(3,773)
Non-credit related portion of other-than-temporary impairment on securities, Tax Expense (Benefit)	0	0	0	0
Reclassification adjustment for gains realized in net income, Tax Expense (Benefit)	(143)	0	(143)	44
Amortization of unrealized holding gains on securities transferred to the held to maturity category, Tax Expense (Benefit)	(23)	(31)	(75)	(105)
Total securities available for sale, Tax Expense (Benefit)	370	456	2,790	(3,834)
Unrealized holding gains on securities	866	782	4,856	(6,091)
Non-credit related portion of other-than-temporary impairment on securities	0	0	0	0
Reclassification adjustment for losses (gains) realized in net income	(232)	0	(232)	71
Amortization of unrealized holding gains on securities transferred to the held to maturity category	(38)	(49)	(121)	(169)
Total securities	596	733	4,503	(6,189)
Derivative instruments:
Unrealized holding losses on derivative instruments, Pre-Tax	68	(481)	(1,252)	1,461
Reclassification adjustment for gains realized in net income, Pre-Tax	0	(35)	0	(203)
Total derivative instruments, Pre-Tax	68	(516)	(1,252)	1,258
Unrealized holding gains on derivative instruments, Tax Expense (Benefit)	26	(184)	(479)	559
Reclassification adjustment for gains realized in net income, Tax Expense (Benefit)	0	(13)	0	(77)
Total derivative instruments, Tax Expense (Benefit)	26	(197)	(479)	482
Unrealized holding gains (losses) on derivative instruments	42	(297)	(773)	902
Reclassification adjustment for gains realized in net income	0	(22)	0	(126)
Totals derivative instruments	42	(319)	(773)	776
Defined benefit pension and post-retirement benefit plans:
Net gain (loss) arising during the period, Pre-Tax	0	0	0	0
Amortization of net actuarial loss recognized in net periodic pension cost, Pre-Tax	76	183	222	437
Total defined benefit pension and post-retirement benefit plans, Pre-Tax	76	183	222	437
Net gain (loss) arising during the period, Tax Expense (Benefit)	0	0	0	0
Amortization of net actuarial loss recognized in net periodic pension cost, Tax Expense (Benefit)	29	70	85	167
Total defined benefit pension and post-retirement benefit plans, Tax Expense (Benefit)	29	70	85	167
Net (loss) gain arising during the period	0	0	0	0
Less amortization of net actuarial loss recognized in net periodic pension cost	47	113	137	270
Total defined benefit pension and post-retirement benefit plans	47	113	137	270
Total other comprehensive income, Pre-Tax	1,110	856	6,263	(8,328)
Total other comprehensive income, Tax Expense (Benefit)	425	329	2,396	(3,185)
Other comprehensive income (loss), net of tax	$ 685	$ 527	$ 3,867	$ (5,143)