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Loans and Allowance for Loan Losses - Allowance for Loan Losses Outstanding by Impairment Methodology (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment $ 5,653 $ 6,928
Collectively evaluated for impairment 33,206 30,330
Non-residential real estate owner occupied [Member]
    
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment 228 462
Collectively evaluated for impairment 4,629 4,824
Non-residential real estate other [Member]
    
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment 2,529 1,934
Collectively evaluated for impairment 8,743 6,663
Residential real estate permanent mortgage [Member]
    
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment 226 218
Collectively evaluated for impairment 2,496 2,480
Residential real estate all other [Member]
    
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment 1,058 2,087
Collectively evaluated for impairment 5,549 4,936
Non-consumer non-real estate [Member]
    
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment 1,052 1,692
Collectively evaluated for impairment 7,811 7,478
Consumer non-real estate [Member]
    
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment 314 315
Collectively evaluated for impairment 2,184 2,054
Other loans [Member]
    
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment 2,460 220
Collectively evaluated for impairment 16,998 16,188
Acquired loans [Member]
    
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items]    
Individually evaluated for impairment      
Collectively evaluated for impairment $ 957 $ 2,777