Securities Investments in continuous unrealized loss position (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	$ 80,793	$ 107,171
Gross Unrealized Losses, Less than Twelve Months	(2,191)	(4,541)
Fair Value, Twelve Months or Greater	22,363	19,426
Gross Unrealized Losses, Twelve Months or Greater	(1,389)	(878)
Fair Value, Total	103,156	126,597
Gross Unrealized Losses, Total	(3,580)	(5,419)
U.S. government agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	9,793	10,218
Gross Unrealized Losses, Less than Twelve Months	(217)	(273)
Fair Value, Twelve Months or Greater	1,396	1,416
Gross Unrealized Losses, Twelve Months or Greater	(65)	(59)
Fair Value, Total	11,189	11,634
Gross Unrealized Losses, Total	(282)	(332)
Obligations of states and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	11,822	24,568
Gross Unrealized Losses, Less than Twelve Months	(766)	(2,539)
Fair Value, Twelve Months or Greater	5,434	1,798
Gross Unrealized Losses, Twelve Months or Greater	(814)	(210)
Fair Value, Total	17,256	26,366
Gross Unrealized Losses, Total	(1,580)	(2,749)
Mortgage-backed securities, Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	38,442	50,048
Gross Unrealized Losses, Less than Twelve Months	(814)	(1,264)
Fair Value, Twelve Months or Greater	12,590	8,228
Gross Unrealized Losses, Twelve Months or Greater	(437)	(360)
Fair Value, Total	51,032	58,276
Gross Unrealized Losses, Total	(1,251)	(1,624)
Mortgage-backed securities, Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	8,775	14,505
Gross Unrealized Losses, Less than Twelve Months	(89)	(152)
Fair Value, Twelve Months or Greater	1,371	1,351
Gross Unrealized Losses, Twelve Months or Greater	(37)	(59)
Fair Value, Total	10,146	15,856
Gross Unrealized Losses, Total	(126)	(211)
Other asset backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	4,956	1,585
Gross Unrealized Losses, Less than Twelve Months	(56)	(39)
Fair Value, Twelve Months or Greater	1,082	2,187
Gross Unrealized Losses, Twelve Months or Greater	(26)	(136)
Fair Value, Total	6,038	3,772
Gross Unrealized Losses, Total	(82)	(175)
Corporate preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	0	0
Gross Unrealized Losses, Less than Twelve Months	0	0
Fair Value, Twelve Months or Greater	0	0
Gross Unrealized Losses, Twelve Months or Greater	0	0
Fair Value, Total	0	0
Gross Unrealized Losses, Total	0	0
Corporate securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	7,005	6,247
Gross Unrealized Losses, Less than Twelve Months	(249)	(274)
Fair Value, Twelve Months or Greater	490	4,446
Gross Unrealized Losses, Twelve Months or Greater	(10)	(54)
Fair Value, Total	7,495	10,693
Gross Unrealized Losses, Total	$ (259)	$ (328)