Business Combinations (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 23, 2011
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Net assets acquired/bargain purchase gain	$ 7,575
Citizens [Member]
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Cost basis net assets acquired	26,682
Cash payment received from FDIC	44,140
Citizens [Member] | Cash and cash equivalents [Member]
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Fair value adjustments:	539
Citizens [Member] | Loans [Member]
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Fair value adjustments:	(57,745)
Citizens [Member] | Foreclosed assets [Member]
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Fair value adjustments:	(5,609)
Citizens [Member] | Core deposit intangible [Member]
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Fair value adjustments:	898
Citizens [Member] | Deposits [Member]
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Fair value adjustments:	(382)
Citizens [Member] | Borrowings [Member]
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Fair value adjustments:	(28)
Citizens [Member] | Other [Member]
Summary of the estimated fair value adjustments resulting in the bargain purchase gain
Fair value adjustments:	$ (920)