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Estimated Fair Values for Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financial Assets:
Cash and cash equivalents	$ 48,926	$ 63,036
Investment securities available for sale	422,196	406,471
Loans and leases, net	829,825	771,192
Collateral dependent impaired loans	15,519	11,301
Loans held-for-sale	250	1,354
Cash surrender value of life insurance policies	38,518	37,657
Other investments	6,406	7,040
Investment in limited partnership	10,622	9,927
Accrued interest receivable	5,177	5,368
Financial Liabilities:
Noninterest-bearing	327,224	300,045
Interest-bearing	822,756	702,270
Fed funds purchased and repurchase agreements	2,890	3,037
Short-term borrowings	24,640	17,120
Long-term borrowings	5,000	15,000
Subordinated debentures	12,229	12,262
Limited partnership capital commitment	1,185	353
Accrued interest payable	346	514
Carrying Amount
Financial Assets:
Cash and cash equivalents	48,926	63,036
Investment securities available for sale	422,196	406,471
Loans and leases, net	784,644	726,302
Collateral dependent impaired loans	19,980	14,627
Loans held-for-sale	250	1,354
Cash surrender value of life insurance policies	38,518	37,657
Other investments	6,406	7,040
Investment in limited partnership	10,622	9,927
Accrued interest receivable	5,177	5,368
Financial Liabilities:
Noninterest-bearing	327,224	300,045
Interest-bearing	822,311	786,223
Fed funds purchased and repurchase agreements	2,890	3,037
Short-term borrowings	24,640	17,120
Long-term borrowings	5,000	15,000
Subordinated debentures	30,928	30,928
Limited partnership capital commitment	1,185	353
Accrued interest payable	346	514
Fair Value | Fair Value, Inputs, Level 1
Financial Assets:
Cash and cash equivalents	48,926	63,036
Investment securities available for sale	1,809	1,347
Loans held-for-sale	250	1,354
Financial Liabilities:
Noninterest-bearing	327,224	300,045
Fair Value | Fair Value, Inputs, Level 2
Financial Assets:
Investment securities available for sale	420,387	405,124
Loans and leases, net	829,825	771,192
Collateral dependent impaired loans	15,212	11,016
Cash surrender value of life insurance policies	38,518	37,657
Other investments	6,406	7,040
Investment in limited partnership	10,622	9,927
Accrued interest receivable	5,177	5,368
Financial Liabilities:
Interest-bearing	822,756	702,270
Fed funds purchased and repurchase agreements	2,890	3,037
Short-term borrowings	24,640	17,120
Long-term borrowings	5,000	15,000
Subordinated debentures	12,229	12,262
Limited partnership capital commitment	1,185	353
Accrued interest payable	346	514
Fair Value | Fair Value, Inputs, Level 3
Financial Assets:
Collateral dependent impaired loans	$ 307	$ 285

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