Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	$ 16		$ 591
Income tax expense	1,112		512
Net income	2,598		1,607
Interest expense on junior subordinated debt	(283)		(271)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Unrealized Investment Gain (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	16	[1]	591	[1]
Income tax expense	(6)	[1]	(220)	[1]
Net income	10	[1]	371	[1]
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	(59)	[1]	(54)	[1]
Net income	(98)	[1]	(92)	[1]
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Pension Plan
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	(220)	[1]	(199)	[1]
Net income	(371)	[1]	(335)	[1]
Amortization of actuarial loss	(591)	[1],[2]	(534)	[1],[2]
Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense on junior subordinated debt	$ (157)	[1]	$ (146)	[1]

[1] Positive amounts are credits/revenues and negative amounts are debits/expenses.

[2] This component is included in the computation of net periodic pension expense (see Note 8, Pension and Other Employee Benefit Plans) which is included in salaries and employee benefits expense.