Investment Securities - Unrealized losses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	$ 249,957	$ 110,926
Less than 12 Months, Unrealized Losses	(7,236)	(1,217)
12 Months or More, Fair Value	35,182	20,910
12 Months or More, Unrealized Losses	(1,793)	(504)
Total Fair Value	285,139	131,836
Total Unrealized Losses	(9,029)	(1,721)
U.S. Government agencies
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	4,132	3,590
Less than 12 Months, Unrealized Losses	(75)	(23)
12 Months or More, Fair Value	968	0
12 Months or More, Unrealized Losses	(9)	0
Total Fair Value	5,100	3,590
Total Unrealized Losses	(84)	(23)
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	89,556	30,572
Less than 12 Months, Unrealized Losses	(5,007)	(385)
12 Months or More, Fair Value	15,015	0
12 Months or More, Unrealized Losses	(1,510)	0
Total Fair Value	104,571	30,572
Total Unrealized Losses	(6,517)	(385)
U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	148,853	76,764
Less than 12 Months, Unrealized Losses	(2,070)	(809)
12 Months or More, Fair Value	19,199	18,024
12 Months or More, Unrealized Losses	(274)	(298)
Total Fair Value	168,052	94,788
Total Unrealized Losses	(2,344)	(1,107)
Other equity securities
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value	7,416
Less than 12 Months, Unrealized Losses	(84)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Total Fair Value	7,416
Total Unrealized Losses	(84)
Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Less than 12 Months, Fair Value		0
Less than 12 Months, Unrealized Losses		0
12 Months or More, Fair Value		2,886
12 Months or More, Unrealized Losses		(206)
Total Fair Value		2,886
Total Unrealized Losses		$ (206)