Accumulated Other Comprehensive Income (''AOCI'') (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Amount Reclassified from AOCI
Realized gains on sale of securities	$ 7	$ 32	$ 38	$ 59
Interest income on taxable securities	2,399	2,975	4,860	6,072
Income before income taxes	3,949	3,905	6,984	6,931
Income tax expense	(1,156)	(1,226)	(2,011)	(2,177)
Net income	2,793	2,679	4,973	4,754
Amount Reclassified from AOCI
Amount Reclassified from AOCI
Net income	(32)	(22)	(47)	(47)
Unrealized gains on available-for-sale securities and I/O strips | Amount Reclassified from AOCI
Amount Reclassified from AOCI
Realized gains on sale of securities	7	32	38	59
Income tax expense	(3)	(13)	(16)	(25)
Net income	4	19	22	34
Unamortized Unrealized Gain on Available-for-Sale Securities Reclassified to Held-to-Maturity | Amount Reclassified from AOCI
Amount Reclassified from AOCI
Interest income on taxable securities	14		28
Income tax expense	(6)		(12)
Net income	8		16
Amortization of defined benefit pension plan items | Amount Reclassified from AOCI
Amount Reclassified from AOCI
Prior service cost		(7)		(14)
Actuarial losses	(75)	(63)	(146)	(126)
Income before income taxes	(75)	(70)	(146)	(140)
Income tax expense	31	29	61	59
Net income	$ (44)	$ (41)	$ (85)	$ (81)