Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Securities:
Unrealized holding gains on securities, Pre-Tax	$ 1,953	$ (11,369)	$ 6,462	$ (11,133)
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	0	0	0	115
Amortization of unrealized holding gains on securities transferred to the held to maturity category, Pre-Tax	(64)	(88)	(135)	(194)
Total securities available for sale, Pre-Tax	1,889	(11,457)	6,327	(11,212)
Unrealized holding gains on securities, Tax Expense (Benefit)	747	(4,350)	2,472	(4,260)
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)	0	0	0	44
Amortization of unrealized holding gains on securities transferred to the held to maturity category, Tax Expense (Benefit)	(25)	(34)	(52)	(74)
Total securities available for sale, Tax Expense (Benefit)	722	(4,384)	2,420	(4,290)
Unrealized holding gains on securities	1,206	(7,019)	3,990	(6,873)
Non-credit related portion of other-than-temporary impairment on securities	0	0	0	0
Reclassification adjustment for losses (gains) realized in net income	0	0	0	71
Amortization of unrealized holding gains on securities transferred to the held to maturity category	(39)	(54)	(83)	(120)
Total securities	1,167	(7,073)	3,907	(6,922)
Derivative instruments:
Unrealized holding losses on derivative instruments, Pre-Tax	(641)	1,607	(1,320)	1,942
Reclassification adjustment for gains realized in net income, Pre-Tax	0	(83)	0	(168)
Total derivative instruments, Pre-Tax	(641)	1,524	(1,320)	1,774
Unrealized holding gains on derivative instruments, Tax Expense (Benefit)	(245)	615	(505)	743
Reclassification adjustment for gains realized in net income, Tax Expense (Benefit)	0	(32)	0	(64)
Total derivative instruments, Tax Expense (Benefit)	(245)	583	(505)	679
Unrealized holding gains (losses) on derivative instruments	(396)	992	(815)	1,199
Reclassification adjustment for gains realized in net income	0	(51)	0	(104)
Totals derivative instruments	(396)	941	(815)	1,095
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	73	138	146	254
Total defined benefit pension and post-retirement benefit plans, Pre-Tax	73	138	146	254
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)	28	53	56	97
Total defined benefit pension and post-retirement benefit plans, Tax Expense (Benefit)	28	53	56	97
Net (loss) gain arising during the period	0	0	0	0
Less amortization of net actuarial loss recognized in net periodic pension cost	45	85	90	157
Total defined benefit pension and post-retirement benefit plans	45	85	90	157
Total other comprehensive income, Pre-Tax	1,321	(9,795)	5,153	(9,184)
Total other comprehensive income, Tax Expense (Benefit)	505	(3,748)	1,971	(3,514)
Other comprehensive income (loss), net of tax	$ 816	$ (6,047)	$ 3,182	$ (5,670)