Business Combinations (Details Textual) (USD $)	3 Months Ended								9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 23, 2011
Business Combinations (Textual) [Abstract]
Bargain purchase gain						$ 7,575,000				$ 7,575,000
Net assets transferred to Bank											270,304,000
Interest expense	1,834,000	2,010,000	2,128,000	2,329,000		2,465,000	2,714,000	2,730,000	5,972,000	7,909,000
Noninterest income	9,127,000	10,577,000	8,265,000	10,489,000	8,029,000	14,723,000	8,251,000	9,350,000	27,969,000	32,324,000
Noninterest expense						7,575,000				7,575,000
Amount of fair value discount accretion included in interest income					3,146,000
Loss on disposal of fixed assets related to system conversion	(16,000)								(404,000)	(15,000)
Data processing and software	1,017,000					940,000			3,589,000	2,748,000
Citizens acquisition [Member]
Business Combinations (Textual) [Abstract]
Bargain purchase gain	1,170,000	1,534,000	2,151,000
Net assets transferred to Bank											26,682,000
Term of Lease Expiration					90 days
Interest income	4,130,000	5,152,000	4,464,000		6,171,000
Interest expense	79,000	5,000	8,000		54,000
Provision for loan losses	529,000	281,000	1,467,000		1,462,000
Noninterest income	574,000	643,000	145,000
Noninterest expense	1,170,000	1,534,000	2,151,000
Amount of fair value discount accretion included in interest income	1,658,000	2,278,000	1,972,000
Loss on disposal of fixed assets related to system conversion			230,000
Data processing and software			415,000
Acquisition method of accounting [Member] | Citizens acquisition [Member]
Business Combinations (Textual) [Abstract]
Bargain purchase gain					7,575,000
Noninterest expense					7,575,000
Noninterest expense [Member]
Business Combinations (Textual) [Abstract]
Bargain purchase gain					1,865,000
Noninterest expense					$ 1,865,000