Securities Amortized costs and fair values of securities available for sale (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 328,027	$ 309,196
Gross Unrealized Gains	5,815	11,416
Gross Unrealized Losses	(5,419)	(1,155)
Fair Value	328,423	319,457
U.S. government agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,367	15,391
Gross Unrealized Gains	304	459
Gross Unrealized Losses	(332)	(28)
Fair Value	21,339	15,822
Obligations of states and political subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	68,904	74,485
Gross Unrealized Gains	1,083	3,920
Gross Unrealized Losses	(2,749)	(105)
Fair Value	67,238	78,300
Mortgage-backed securities, Agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	166,095	161,564
Gross Unrealized Gains	3,539	5,659
Gross Unrealized Losses	(1,624)	(280)
Fair Value	168,010	166,943
Mortgage-backed securities, Non-agency [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,029	15,310
Gross Unrealized Gains	116	287
Gross Unrealized Losses	(211)	(18)
Fair Value	21,934	15,579
Other Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	33,883	33,648
Gross Unrealized Gains	710	1,079
Gross Unrealized Losses	(175)	(85)
Fair Value	34,418	34,642
Corporate preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	69	68
Gross Unrealized Gains	5	0
Gross Unrealized Losses	0	(6)
Fair Value	74	62
Corporate securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,680	8,730
Gross Unrealized Gains	58	12
Gross Unrealized Losses	(328)	(633)
Fair Value	$ 15,410	$ 8,109