Business Combinations, (Bay Bank and Trust Company) (Details) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012 Bay Bank and Trust Company [Member]	Mar. 31, 2012 Bay Bank and Trust Company [Member]	Jun. 30, 2012 Bay Bank and Trust Company [Member]	Mar. 16, 2012 Bay Bank and Trust Company [Member]
Business Acquisition [Line Items]
Age of acquired entity						76
Business acquisition, cost of acquired entity, cash paid						$ 10,000,000
Business acquisition, equity issued (in shares)						510
Business acquisition, equity issued, value assigned						12,000,000
Assets:
Cash and due from banks						88,154,000
Securities available for sale						26,369,000
Acquired noncovered loans						97,914,000
Premises and equipment, net						9,466,000
Identifiable intangible assets						7,017,000
Other real estate						2,569,000
Other assets						3,471,000
Total Assets						234,960,000
Liabilities:
Deposits						208,796,000
Other liabilities						526,000
Total Liabilities						209,322,000
Net assets acquired at fair value						25,638,000
Consideration paid to acquiree						22,003,000
Bargain purchase gain	0	2,754,000	881,000	2,800,000	3,635,000
Income taxes					0
Bargain purchase gain, net of taxes					3,635,000
Business acquisition, total transaction expenses				2,600,000
Business acquisition, severance expense				672,000
Business acquisition, contract termination and other expenses				$ 1,900,000
Amortization period of acquired intangible asset (in years)				10