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Fair value estimates - Carrying and Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment securities:    
Available-for-sale $ 302,226 $ 299,715
Held-to-maturity 16,597 17,175
Mortgage servicing rights 833 880
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets:    
Cash and cash equivalents 79,212 51,310
Investment securities:    
Available-for-sale 1,093 1,097
Held-to-maturity      
Loans held for sale      
Net loans      
Accrued interest receivable      
Mortgage servicing rights      
Restricted equity securities      
Assets, Fair Value Disclosure      
Financial liabilities:    
Deposits      
Short-term borrowings      
Long-term debt      
Accrued interest payable      
Liabilities, total      
Significant Other Observable Inputs (Level 2) [Member]
   
Financial assets:    
Cash and cash equivalents      
Investment securities:    
Available-for-sale 301,133 298,618
Held-to-maturity 16,597 17,175
Loans held for sale 1,816 1,757
Net loans      
Accrued interest receivable 5,366 5,866
Mortgage servicing rights 1,440 1,440
Restricted equity securities 3,858 4,102
Assets, Fair Value Disclosure      
Financial liabilities:    
Deposits 1,406,423 1,381,946
Short-term borrowings 22,539 22,052
Long-term debt 37,561 37,468
Accrued interest payable 610 723
Liabilities, total      
Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets:    
Cash and cash equivalents      
Investment securities:    
Available-for-sale      
Held-to-maturity      
Loans held for sale      
Net loans 1,179,290 1,180,387
Accrued interest receivable      
Mortgage servicing rights      
Restricted equity securities      
Assets, Fair Value Disclosure      
Financial liabilities:    
Deposits      
Short-term borrowings      
Long-term debt      
Accrued interest payable      
Liabilities, total      
Carrying Value [Member]
   
Financial assets:    
Cash and cash equivalents 79,212 51,310
Investment securities:    
Available-for-sale 302,226 299,715
Held-to-maturity 16,607 17,295
Loans held for sale 1,816 1,757
Net loans 1,168,263 1,167,966
Accrued interest receivable 5,366 5,866
Mortgage servicing rights 833 880
Restricted equity securities 3,858 4,102
Assets, Fair Value Disclosure 1,578,181 1,548,891
Financial liabilities:    
Deposits 1,404,066 1,379,507
Short-term borrowings 22,539 22,052
Long-term debt 35,838 36,743
Accrued interest payable 610 723
Liabilities, total 1,463,053 1,439,025
Fair Value [Member]
   
Financial assets:    
Cash and cash equivalents 79,212 51,310
Investment securities:    
Available-for-sale 302,226 299,715
Held-to-maturity 16,597 17,175
Loans held for sale 1,816 1,757
Net loans 1,179,290 1,180,387
Accrued interest receivable 5,366 5,866
Mortgage servicing rights 1,440 1,440
Restricted equity securities 3,858 4,102
Assets, Fair Value Disclosure 1,589,805 1,561,752
Financial liabilities:    
Deposits 1,406,423 1,381,946
Short-term borrowings 22,539 22,052
Long-term debt 37,561 37,468
Accrued interest payable 610 723
Liabilities, total $ 1,467,133 $ 1,442,189