Assets Acquired In FDIC-Assisted Acquisitions (Estimated Fair Value Of Assets And Liabilities Assumed) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Central Bank of Georgia (CBG)
Cash and due from banks	$ 33,150
Securities available for sale	39,920
Loans	124,782
Foreclosed property	6,177
Estimated FDIC indemnification asset	52,654
Other assets	4,606
Assets acquired	261,289
Cash received (paid) to settle the acquisition	31,900
Fair value of assets acquired	293,189
Deposits	261,036
Other borrowings	10,334
Other liabilities	1,782
Fair value of liabilities assumed	273,152
Net assets acquired / gain from acquisition	20,037
Montgomery Bank & Trust
Cash and due from banks	16,726
Loans	1,218
Other assets	183
Assets acquired	18,127
Cash received (paid) to settle the acquisition	138,740
Fair value of assets acquired	156,867
Deposits	156,699
Other liabilities	168
Fair value of liabilities assumed	156,867
Net assets acquired / gain from acquisition