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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, 2013
Dec. 31, 2012
Available-for-Sale    
Due within one year, Amortized cost $ 1,386  
Due after one year but within five years, Amortized cost 14,227  
Due after five years but within ten years, Amortized cost 196,906  
Due after ten years, Amortized cost 5,002  
Amortized cost 541,642  
Amortized Cost 541,642 534,810
Tax equivalent purchase yield 3.01%  
Average contractual maturity (in years) 11 years 3 months  
Due within one year, Fair value 1,393  
Due after one year but within five years, Fair value 14,557  
Due after five years but within ten years, Fair value 184,474  
Due after ten years, Fair value 3,974  
Fair Value 519,820 534,358
Due within one year, tax equivalent purchase yield 3.85% [1]  
Due after one year through five years, tax equivalent purchase yield 5.69% [1]  
Due after five years through ten years, tax equivalent purchase yield 3.63% [1]  
Due after ten years, tax equivalent purchase yield 1.15% [1]  
Held-to-Maturity    
Total amortized cost 568 816
Fair Value 579 832
Due within one year, tax equivalent purchase yield 8.05% [1]  
Due after one year through five years, tax equivalent purchase yield 8.17% [1]  
Due after five years through ten years, tax equivalent purchase yield    [1]  
Due after ten years, tax equivalent purchase yield    [1]  
US Treasury Securities
    
Available-for-Sale    
Due after five years but within ten years, Amortized cost 9,708  
Tax equivalent purchase yield 2.09%  
Average contractual maturity (in years) 9 years 4 months 17 days  
Due after five years but within ten years, Fair value 9,013  
Municipal securities
    
Available-for-Sale    
Due within one year, Amortized cost 1,386  
Due after one year but within five years, Amortized cost 14,227  
Due after five years but within ten years, Amortized cost 131,436  
Tax equivalent purchase yield 4.76%  
Average contractual maturity (in years) 10 years 5 months 1 day  
Due within one year, Fair value 1,393  
Due after one year but within five years, Fair value 14,557  
Due after five years but within ten years, Fair value 128,330  
Held-to-Maturity    
Due within one year, Amortized cost 190  
Due after one year but within five years, Amortized cost 378  
Due after five years but within ten years, Amortized cost     
Due after ten years, Amortized cost     
Total amortized cost 568  
Tax equivalent purchase yield 8.13%  
Average contractual maturity (in years) 1 year 3 months 29 days  
Due within one year, Fair value 193  
Due after one year but within five years, Fair value 386  
Due after five years but within ten years, Fair value     
Due after ten years, Fair value     
Fair Value 579  
Corporate securities
    
Available-for-Sale    
Due after five years but within ten years, Amortized cost 55,762  
Due after ten years, Amortized cost 5,002  
Tax equivalent purchase yield 1.34%  
Average contractual maturity (in years) 13 years 6 months 18 days  
Due after five years but within ten years, Fair value 47,131  
Due after ten years, Fair value 3,974  
Total Mortgage Backed Securities
    
Available-for-Sale    
Amortized Cost 318,862 324,538
Tax equivalent purchase yield 2.50% [1]  
Fair Value 310,175 326,964
Equity Securities
    
Available-for-Sale    
Amortized Cost 5,259 3,446
Tax equivalent purchase yield 4.92% [1]  
Fair Value 5,247 3,531
Debt Securities
    
Available-for-Sale    
Amortized cost 217,521  
Fair Value 204,398  
Debt Securities | US Treasury Securities
    
Available-for-Sale    
Amortized cost 9,708  
Fair Value 9,013  
Debt Securities | Municipal securities
    
Available-for-Sale    
Amortized cost 147,049  
Fair Value 144,280  
Debt Securities | Corporate securities
    
Available-for-Sale    
Amortized cost 60,764  
Fair Value $ 51,105  
[1] Fully taxable equivalent at the rate of 35%.