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Amortized Cost and Estimated Fair Value of Available-For-Sale Securities, Including Gross Unrealized Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 566,664 $ 534,810
Unrealized Gains 6,530 14,408
Unrealized Losses (23,036) (14,860)
Fair Value 550,158 534,358
OTTI in AOCI (2,805) [1] (3,148) [1]
US Treasury Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,694  
Unrealized Losses (280)  
Fair Value 9,414  
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 153,022 151,119
Unrealized Gains 2,910 8,195
Unrealized Losses (3,951) (97)
Fair Value 151,981 159,217
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 55,735 55,707
Unrealized Losses (9,553) (11,061)
Fair Value 46,182 44,646
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 329,209 310,323
Unrealized Gains 3,431 6,023
Unrealized Losses (6,374) (449)
Fair Value 326,266 315,897
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 13,689 14,215
Unrealized Losses (2,805) (3,148)
Fair Value 10,884 11,067
OTTI in AOCI (2,805) [1] (3,148) [1]
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 342,898 324,538
Unrealized Gains 3,431 6,023
Unrealized Losses (9,179) (3,597)
Fair Value 337,150 326,964
OTTI in AOCI (2,805) [1] (3,148) [1]
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,315 3,446
Unrealized Gains 189 190
Unrealized Losses (73) (105)
Fair Value $ 5,431 $ 3,531
[1] Other-than-temporary impairment in accumulated other comprehensive income