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Fair value estimates - Carrying and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investment securities:
Available-for-sale	$ 318,790	$ 339,586
Held-to-maturity	14,104	15,215
Mortgage servicing rights	566	676
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	35,557	31,426
Investment securities:
Available-for-sale	30,685	48,550
Significant Other Observable Inputs (Level 2) [Member]
Investment securities:
Available-for-sale	288,105	291,036
Held-to-maturity	14,104	15,215
Loans held for sale	2,883	3,492
Accrued interest receivable	5,507	5,580
Mortgage servicing rights	1,227	1,466
Restricted equity securities	3,357	3,687
Financial liabilities:
Deposits	1,425,821	1,427,081
Short-term borrowings	25,860	19,557
Long-term debt	33,145	34,772
Accrued interest payable	443	574
Significant Unobservable Inputs (Level 3) [Member]
Investment securities:
Net loans	1,229,055	1,210,369
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	35,557	31,426
Investment securities:
Available-for-sale	318,790	339,586
Held-to-maturity	13,626	14,665
Loans held for sale	2,879	3,486
Net loans	1,220,113	1,199,556
Accrued interest receivable	5,507	5,580
Mortgage servicing rights	566	676
Restricted equity securities	3,357	3,687
Assets, Fair Value Disclosure	1,600,395	1,598,662
Financial liabilities:
Deposits	1,424,767	1,425,558
Short-term borrowings	25,860	19,557
Long-term debt	31,663	33,140
Accrued interest payable	443	574
Liabilities, total	1,482,733	1,478,829
Fair Value [Member]
Financial assets:
Cash and cash equivalents	35,557	31,426
Investment securities:
Available-for-sale	318,790	339,586
Held-to-maturity	14,104	15,215
Loans held for sale	2,883	3,492
Net loans	1,229,055	1,210,369
Accrued interest receivable	5,507	5,580
Mortgage servicing rights	1,227	1,466
Restricted equity securities	3,357	3,687
Assets, Fair Value Disclosure	1,610,480	1,610,821
Financial liabilities:
Deposits	1,425,821	1,427,081
Short-term borrowings	25,860	19,557
Long-term debt	33,145	34,772
Accrued interest payable	443	574
Liabilities, total	$ 1,485,269	$ 1,481,984

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