Fair Value Measurements (Fair Value of Assets on a Recurring Basis) (Details) (Fair Value Measurements Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	$ 734,052	$ 582,054	$ 675,476
Loans Held-for-sale	9,180	17,665
Total assets measured at fair value on a recurring basis	743,232	599,719
Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Loans Held-for-sale	0	0
Total assets measured at fair value on a recurring basis	0	0
Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	734,052	582,054	675,476
Loans Held-for-sale	9,180	17,665
Total assets measured at fair value on a recurring basis	743,232	599,719
Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Loans Held-for-sale	0	0
Total assets measured at fair value on a recurring basis	0	0
Government sponsored agencies [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	92,088	97,557	95,145
Government sponsored agencies [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Government sponsored agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	92,088	97,557	95,145
Government sponsored agencies [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
State and political subdivisions [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	45,780	49,965	52,131
State and political subdivisions [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
State and political subdivisions [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	45,780	49,965	52,131
State and political subdivisions [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Residential mortgage-backed securities [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	308,372	99,411	113,091
Residential mortgage-backed securities [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Residential mortgage-backed securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	308,372	99,411	113,091
Residential mortgage-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Collateralized mortgage obligations [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	220,515	263,592	321,897
Collateralized mortgage obligations [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Collateralized mortgage obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	220,515	263,592	321,897
Collateralized mortgage obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Corporate bonds [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	65,515	69,795	91,766
Corporate bonds [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	65,515	69,795	91,766
Corporate bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Preferred stock [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	1,782	1,734	1,446
Preferred stock [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	0	0	0
Preferred stock [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	1,782	1,734	1,446
Preferred stock [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of assets measured at fair value on a recurring basis
Total investment securities-available-for-sale	$ 0	$ 0	$ 0