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Amortized Cost, Fair Value, and Weighted-Average Yield of Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Available-for-Sale    
Due within one year, Amortized cost $ 111  
Due after one year but within five years, Amortized cost 19,813  
Due after five years but within ten years, Amortized cost 18,888  
Due after ten years, Amortized cost 168,014  
Amortized cost 534,810 491,615
Tax equivalent purchase yield 4.67%  
Average contractual maturity (in years) 11 years 10 months 24 days  
Due within one year, Fair value 113  
Due after one year but within five years, Fair value 20,523  
Due after five years but within ten years, Fair value 19,864  
Due after ten years, Fair value 163,363  
Fair Value 534,358 482,430
Due within one year, tax equivalent purchase yield 5.53% [1]  
Due after one year through five years, tax equivalent purchase yield 5.53% [1]  
Due after five years through ten years, tax equivalent purchase yield 5.62% [1]  
Due after ten years, tax equivalent purchase yield 4.46% [1]  
Held-to-Maturity    
Total amortized cost 816 3,490
Fair Value 832 3,532
Due within one year, tax equivalent purchase yield 7.99% [1]  
Due after one year through five years, tax equivalent purchase yield 8.13% [1]  
Due after five years through ten years, tax equivalent purchase yield 0.00% [1]  
Due after ten years, tax equivalent purchase yield 0.00% [1]  
US States and Political Subdivisions Debt Securities
    
Available-for-Sale    
Due within one year, Amortized cost 111  
Due after one year but within five years, Amortized cost 19,813  
Due after five years but within ten years, Amortized cost 18,888  
Due after ten years, Amortized cost 112,307  
Tax equivalent purchase yield 5.24%  
Average contractual maturity (in years) 10 years 9 months 22 days  
Due within one year, Fair value 113  
Due after one year but within five years, Fair value 20,523  
Due after five years but within ten years, Fair value 19,864  
Due after ten years, Fair value 118,717  
Held-to-Maturity    
Due within one year, Amortized cost 250  
Due after one year but within five years, Amortized cost 566  
Due after five years but within ten years, Amortized cost     
Due after ten years, Amortized cost     
Total amortized cost 816  
Tax equivalent purchase yield 8.09%  
Average contractual maturity (in years) 1 year 8 months 23 days  
Due within one year, Fair value 253  
Due after one year but within five years, Fair value 579  
Due after five years but within ten years, Fair value     
Due after ten years, Fair value     
Fair Value 832  
Corporate Bonds And Notes
    
Available-for-Sale    
Due after ten years, Amortized cost 55,707  
Tax equivalent purchase yield 3.12%  
Average contractual maturity (in years) 14 years 10 months 10 days  
Due after ten years, Fair value 44,646  
Total Mortgage Backed Securities
    
Available-for-Sale    
Amortized cost 324,538 290,364
Tax equivalent purchase yield 2.50% [1]  
Fair Value 326,964 290,132
Equity Securities
    
Available-for-Sale    
Amortized cost 3,446 419
Tax equivalent purchase yield 0.47% [1]  
Fair Value 3,531 521
Debt Securities
    
Available-for-Sale    
Amortized cost 206,826  
Fair Value 203,863  
Debt Securities | US States and Political Subdivisions Debt Securities
    
Available-for-Sale    
Amortized cost 151,119  
Fair Value 159,217  
Debt Securities | Corporate Bonds And Notes
    
Available-for-Sale    
Amortized cost 55,707  
Fair Value $ 44,646  
[1] Fully taxable equivalent at the rate of 35%.