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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
Mar. 31, 2014
Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment $ 5,375 $ 6,517
Collectively evaluated for impairment 34,549 32,147
Non-residential real estate owner occupied [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 361 210
Collectively evaluated for impairment 4,651 4,656
Non-residential real estate other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,929 2,484
Collectively evaluated for impairment 8,756 7,981
Residential real estate permanent mortgage [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 588 224
Collectively evaluated for impairment 2,649 2,532
Residential real estate all other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 733 1,899
Collectively evaluated for impairment 5,752 5,266
Non-consumer non-real estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 1,133 1,211
Collectively evaluated for impairment 8,570 7,771
Consumer non-real estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 389 290
Collectively evaluated for impairment 2,184 2,094
Other loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 242 199
Collectively evaluated for impairment 1,830 1,623
Acquired loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment      
Collectively evaluated for impairment $ 157 $ 224