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Fair value of financial instruments - Carrying and Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investment securities:    
Available-for-sale $ 299,715 $ 161,391
Held-to-maturity 17,175 16,774
Mortgage servicing rights 880 491
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets:    
Cash and cash equivalents 51,310 47,844
Investment securities:    
Available-for-sale 1,097 1,071
Significant Observable Inputs (Level 2) [Member]
   
Investment securities:    
Available-for-sale 298,618 160,320
Held-to-maturity 17,175 16,774
Loans held for sale 1,757  
Accrued interest receivable 5,866 2,862
Mortgage servicing rights 1,440 879
Restricted equity securities 4,102 4,212
Financial liabilities:    
Deposits 1,381,946 724,771
Short-term borrowings 22,052 8,019
Long-term debt 37,468 48,625
Accrued interest payable 723 716
Significant Unobservable Inputs (Level 3) [Member]
   
Investment securities:    
Net loans 1,180,387 627,712
Carrying Value [Member]
   
Financial assets:    
Cash and cash equivalents 51,310 47,844
Investment securities:    
Available-for-sale 299,715 161,391
Held-to-maturity 17,295 15,902
Loans held for sale 1,757  
Net loans 1,167,966 616,580
Accrued interest receivable 5,866 2,862
Mortgage servicing rights 880 491
Restricted equity securities 4,102 4,212
Assets, Fair Value Disclosure 1,548,891 849,282
Financial liabilities:    
Deposits 1,379,507 721,948
Short-term borrowings 22,052 8,019
Long-term debt 36,743 45,397
Accrued interest payable 723 716
Liabilities, total 1,439,025 776,080
Fair Value [Member]
   
Financial assets:    
Cash and cash equivalents 51,310 47,844
Investment securities:    
Available-for-sale 299,715 161,391
Held-to-maturity 17,175 16,774
Loans held for sale 1,757  
Net loans 1,180,387 627,712
Accrued interest receivable 5,866 2,862
Mortgage servicing rights 1,440 879
Restricted equity securities 4,102 4,212
Assets, Fair Value Disclosure 1,561,752 861,674
Financial liabilities:    
Deposits 1,381,946 724,771
Short-term borrowings 22,052 8,019
Long-term debt 37,468 48,625
Accrued interest payable 723 716
Liabilities, total $ 1,442,189 $ 782,131