Investment Securities (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Gross realized gains and losses
Gross realized gains	$ 1,274	$ 173	$ 2,320	$ 853
Gross realized losses		3	60	94
Impairment charges included in gross realized loss	0	0	0	0
U.S. Government and agency securities
Gross realized gains and losses
Gross realized gains				138
State and political securities
Gross realized gains and losses
Gross realized gains	1,062	45	1,641	51
Gross realized losses		2	60	2
Other debt securities
Gross realized gains and losses
Gross realized gains	178	22	299	77
Financial institution equity securities
Gross realized gains and losses
Gross realized gains		106	130	461
Gross realized losses		1		67
Other equity securities
Gross realized gains and losses
Gross realized gains	34		250	126
Gross realized losses				$ 25