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Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financial Assets:    
Cash and cash equivalents $ 66,982 $ 61,818
Investment securities available for sale 393,576 380,188
Loans and leases, net 831,835 873,309
Collateral dependent impaired loans 14,032 27,449
Loans held-for-sale 523 210
Cash surrender value of life insurance policies 38,940 38,007
Other investments 5,932 6,370
Investment in Limited Partnership 9,826 10,316
Accrued interest receivable 4,935 5,095
Financial Liabilities:    
Noninterest-bearing 357,540 352,597
Interest-bearing 797,833 821,911
Fed Funds Purchased and Repurchase Agreements 1,963 1,419
Short-term borrowings 0 36,650
Long-term borrowings 0 5,038
Subordinated debentures 19,304 12,141
Limited partnership capital commitment 951 962
Accrued Interest Payable 200 304
Commitments to extend credit
    
Off-balance-sheet financial instruments:    
Notional Amount 387,241 225,400
Standby Letters of Credit
    
Off-balance-sheet financial instruments:    
Notional Amount 8,316 6,690
Commercial lines of credit
    
Off-balance-sheet financial instruments:    
Notional Amount 8,533 8,539
Fair Value, Inputs, Level 1
    
Financial Assets:    
Cash and cash equivalents 66,982 61,818
Investment securities available for sale 2,234 1,809
Loans and leases, net 0 0
Collateral dependent impaired loans 0 0
Loans held-for-sale 523 210
Cash surrender value of life insurance policies 0 0
Other investments 0 0
Investment in Limited Partnership 0 0
Accrued interest receivable 0 0
Financial Liabilities:    
Noninterest-bearing 357,540 352,597
Interest-bearing 0 0
Fed Funds Purchased and Repurchase Agreements 0 0
Short-term borrowings 0 0
Long-term borrowings 0 0
Subordinated debentures 0 0
Limited partnership capital commitment 0 0
Accrued Interest Payable 0 0
Fair Value, Inputs, Level 2
    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities available for sale 391,342 378,379
Loans and leases, net 831,835 873,309
Collateral dependent impaired loans 14,032 27,449
Loans held-for-sale 0 0
Cash surrender value of life insurance policies 38,940 38,007
Other investments 5,932 6,370
Investment in Limited Partnership 9,826 10,316
Accrued interest receivable 4,935 5,095
Financial Liabilities:    
Noninterest-bearing 0 0
Interest-bearing 797,833 821,911
Fed Funds Purchased and Repurchase Agreements 1,963 1,419
Short-term borrowings 0 36,650
Long-term borrowings 0 5,038
Subordinated debentures 19,304 12,141
Limited partnership capital commitment 951 962
Accrued Interest Payable 200 304
Fair Value, Inputs, Level 3
    
Financial Assets:    
Cash and cash equivalents 0 0
Investment securities available for sale 0 0
Loans and leases, net 0 0
Collateral dependent impaired loans 0 0
Loans held-for-sale 0 0
Cash surrender value of life insurance policies 0 0
Other investments 0 0
Investment in Limited Partnership 0 0
Accrued interest receivable 0 0
Financial Liabilities:    
Noninterest-bearing 0 0
Interest-bearing 0 0
Fed Funds Purchased and Repurchase Agreements 0 0
Short-term borrowings 0 0
Long-term borrowings 0 0
Subordinated debentures 0 0
Limited partnership capital commitment 0 0
Accrued Interest Payable 0 0
Carrying Amount
    
Financial Assets:    
Cash and cash equivalents 66,982 61,818
Investment securities available for sale 393,576 380,188
Loans and leases, net 785,219 839,629
Collateral dependent impaired loans 14,032 27,449
Loans held-for-sale 523 210
Cash surrender value of life insurance policies 38,940 38,007
Other investments 5,932 6,370
Investment in Limited Partnership 9,826 10,316
Accrued interest receivable 4,935 5,095
Financial Liabilities:    
Noninterest-bearing 357,540 352,597
Interest-bearing 797,476 821,437
Fed Funds Purchased and Repurchase Agreements 1,963 1,419
Short-term borrowings 0 36,650
Long-term borrowings 0 5,000
Subordinated debentures 30,928 30,928
Limited partnership capital commitment 951 962
Accrued Interest Payable $ 200 $ 304