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Amortized Cost and Fair Value of Available-For-Sale Securities, Including Gross Unrealized Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 541,642 $ 534,810
Unrealized Gains 4,467 14,408
Unrealized Losses (26,289) (14,860)
Fair Value 519,820 534,358
OTTI in AOCI (2,754) [1] (3,148) [1]
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 147,049 151,119
Unrealized Gains 1,868 8,195
Unrealized Losses (4,637) (97)
Fair Value 144,280 159,217
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 55,764 55,707
Unrealized Losses (9,530) (11,061)
Fair Value 46,234 44,646
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 306,319 310,323
Unrealized Gains 2,575 6,023
Unrealized Losses (8,508) (449)
Fair Value 300,386 315,897
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 12,543 14,215
Unrealized Losses (2,754) (3,148)
Fair Value 9,789 11,067
OTTI in AOCI (2,754) [1] (3,148) [1]
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 318,862 324,538
Unrealized Gains 2,575 6,023
Unrealized Losses (11,262) (3,597)
Fair Value 310,175 326,964
OTTI in AOCI (2,754) [1] (3,148) [1]
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,259 3,446
Unrealized Gains 24 190
Unrealized Losses (36) (105)
Fair Value 5,247 3,531
US Treasury Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,708  
Unrealized Losses (695)  
Fair Value 9,013  
Corporate securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,000  
Unrealized Losses (129)  
Fair Value $ 4,871  
[1] Other-than-temporary impairment in accumulated other comprehensive income