Securities Investments in continuous unrealized loss position (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Held to Maturity, Fair Value, Less than Twelve Months	$ 1,374	$ 1,397
Held to Maturity, Gross Unrealized Losses, Less than Twelve Months	(126)	(103)
Held to Maturity, Fair Value, Twelve Months or Greater	0	0
Held to Maturity, Gross Unrealized Losses, Twelve Months or Greater	0	0
Held to Maturity, Fair Value	1,374	1,397
Held to Maturity, Gross Unrealized Losses, Total	(126)	(103)
Fair Value, Less than Twelve Months	105,027	77,450
Gross Unrealized Losses, Less than Twelve Months	(1,283)	(1,009)
Fair Value, Twelve Months or Greater	26,369	26,915
Gross Unrealized Losses, Twelve Months or Greater	(1,066)	(1,029)
Fair Value, Total	131,396	104,365
Gross Unrealized Losses, Total	(2,349)	(2,038)
U.S. government agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	18,059	15,331
Gross Unrealized Losses, Less than Twelve Months	(87)	(65)
Fair Value, Twelve Months or Greater	2,553	5,833
Gross Unrealized Losses, Twelve Months or Greater	(69)	(138)
Fair Value, Total	20,612	21,164
Gross Unrealized Losses, Total	(156)	(203)
Obligations of states and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Held to Maturity, Fair Value, Less than Twelve Months	1,374	1,397
Held to Maturity, Gross Unrealized Losses, Less than Twelve Months	(126)	(103)
Held to Maturity, Fair Value, Twelve Months or Greater	0	0
Held to Maturity, Gross Unrealized Losses, Twelve Months or Greater	0	0
Held to Maturity, Fair Value	1,374	1,397
Held to Maturity, Gross Unrealized Losses, Total	(126)	(103)
Fair Value, Less than Twelve Months	22,972	2,780
Gross Unrealized Losses, Less than Twelve Months	(288)	(14)
Fair Value, Twelve Months or Greater	3,504	3,456
Gross Unrealized Losses, Twelve Months or Greater	(233)	(195)
Fair Value, Total	26,476	6,236
Gross Unrealized Losses, Total	(521)	(209)
Mortgage-backed securities, Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	24,994	28,065
Gross Unrealized Losses, Less than Twelve Months	(327)	(327)
Fair Value, Twelve Months or Greater	6,692	11,027
Gross Unrealized Losses, Twelve Months or Greater	(216)	(415)
Fair Value, Total	31,686	39,092
Gross Unrealized Losses, Total	(543)	(742)
Mortgage-backed securities, Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	11,879	15,488
Gross Unrealized Losses, Less than Twelve Months	(53)	(167)
Fair Value, Twelve Months or Greater	55	4,730
Gross Unrealized Losses, Twelve Months or Greater	(1)	(60)
Fair Value, Total	11,934	20,218
Gross Unrealized Losses, Total	(54)	(227)
Other asset backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	14,191	6,594
Gross Unrealized Losses, Less than Twelve Months	(86)	(45)
Fair Value, Twelve Months or Greater	10,890	1,077
Gross Unrealized Losses, Twelve Months or Greater	(222)	(13)
Fair Value, Total	25,081	7,671
Gross Unrealized Losses, Total	(308)	(58)
Corporate securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than Twelve Months	12,932	9,192
Gross Unrealized Losses, Less than Twelve Months	(442)	(391)
Fair Value, Twelve Months or Greater	2,675	792
Gross Unrealized Losses, Twelve Months or Greater	(325)	(208)
Fair Value, Total	15,607	9,984
Gross Unrealized Losses, Total	$ (767)	$ (599)