Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	$ 719,284	$ 638,107
Trading securities	3,620	3,233
Interest rate swaps	(1,848)
U.S. Treasury [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	5,050	8,130
U.S. Government Sponsored Entities [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	119,753	107,492
Trading securities	58	55
States and political subdivisions [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	172,238	158,437
Residential mortgage and asset backed [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	357,804	300,126
Commercial mortgage and asset backed [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	1,947	2,122
Corporate notes and bonds [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	14,519	13,860
Trading securities	102	100
Pooled trust preferred [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	360	340
Pooled SBA [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	46,061	46,056
Other securities [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	1,552	1,544
Equity securities - financial services [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	555	779
Equity securities - industrials [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	541	324
Equity securities - health care [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	433	204
Equity securities - utilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities		197
Large cap growth mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	157	145
Certificates of deposit [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	407	255
International mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	267	257
Equity securities - energy [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	317	72
Equity securities - technology [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	92	75
Equity securities - consumer discretionary [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	54	126
Money market mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	96	241
Large cap value mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	106	105
Real estate investment trust mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	66	68
Equity securities - consumer staples [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	132	145
Small cap mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	27	25
Mid cap mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	26	23
Equity securities - materials [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	184	37
Interest rate swap [Member]
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps		(1,669)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	51,173	62,832
Trading securities	3,460	3,078
Interest rate swaps	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Sponsored Entities [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	2,000
Trading securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | States and political subdivisions [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	4,655
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential mortgage and asset backed [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	3,560	8,577
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commercial mortgage and asset backed [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate notes and bonds [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Trading securities	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pooled trust preferred [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Pooled SBA [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	46,061	46,056
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other securities [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	1,552	1,544
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - financial services [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	555	779
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - industrials [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	541	324
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - health care [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	433	204
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - utilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities		197
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Large cap growth mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	157	145
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Certificates of deposit [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	407	255
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | International mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	267	257
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - energy [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	317	72
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - technology [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	92	75
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - consumer discretionary [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	54	126
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Large cap value mutual fund [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	106
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	96	241
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Large cap value mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities		105
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Real estate investment trust mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	66	68
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - consumer staples [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	132	145
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Small cap mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	27	25
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mid cap mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	26	23
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities - materials [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	184	37
Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	665,766	572,875
Trading securities	160	155
Interest rate swaps	(1,848)
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	5,050	8,130
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Entities [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	119,753	105,492
Trading securities	58	55
Significant Other Observable Inputs (Level 2) [Member] | States and political subdivisions [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	172,238	153,782
Significant Other Observable Inputs (Level 2) [Member] | Residential mortgage and asset backed [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	354,244	291,549
Significant Other Observable Inputs (Level 2) [Member] | Commercial mortgage and asset backed [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	1,947	2,122
Significant Other Observable Inputs (Level 2) [Member] | Corporate notes and bonds [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	12,534	11,800
Trading securities	102	100
Significant Other Observable Inputs (Level 2) [Member] | Pooled trust preferred [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Other Observable Inputs (Level 2) [Member] | Pooled SBA [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Other Observable Inputs (Level 2) [Member] | Other securities [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - financial services [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - industrials [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - health care [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - utilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities		0
Significant Other Observable Inputs (Level 2) [Member] | Large cap growth mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Certificates of deposit [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | International mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - energy [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - technology [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - consumer discretionary [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Large cap value mutual fund [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0
Significant Other Observable Inputs (Level 2) [Member] | Money market mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Large cap value mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities		0
Significant Other Observable Inputs (Level 2) [Member] | Real estate investment trust mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - consumer staples [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Small cap mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Mid cap mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Equity securities - materials [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Other Observable Inputs (Level 2) [Member] | Interest rate swap [Member]
Assets and liabilities measured at fair value on a recurring basis
Interest rate swaps		(1,669)
Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	2,345	2,400
Trading securities	0	0
Interest rate swaps	0	0
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Sponsored Entities [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | States and political subdivisions [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential mortgage and asset backed [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Commercial mortgage and asset backed [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Corporate notes and bonds [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	1,985	2,060
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Pooled trust preferred [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	360	340
Significant Unobservable Inputs (Level 3) [Member] | Pooled SBA [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Other securities [Member]
Assets and liabilities measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - financial services [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - industrials [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - health care [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - utilities [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities		0
Significant Unobservable Inputs (Level 3) [Member] | Large cap growth mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Certificates of deposit [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | International mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - energy [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - technology [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - consumer discretionary [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Large cap value mutual fund [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0
Significant Unobservable Inputs (Level 3) [Member] | Money market mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Large cap value mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities		0
Significant Unobservable Inputs (Level 3) [Member] | Real estate investment trust mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - consumer staples [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Small cap mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Mid cap mutual funds [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	0	0
Significant Unobservable Inputs (Level 3) [Member] | Equity securities - materials [Member]
Assets and liabilities measured at fair value on a recurring basis
Trading securities	$ 0	$ 0