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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
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 499,298 $ 541,642
Unrealized Gains 5,725 4,467
Unrealized Losses (21,159) (26,289)
Fair Value 483,864 519,820
OTTI in AOCI (1,838) [1] (2,754) [1]
Municipal securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 144,438 147,049
Unrealized Gains 3,075 1,868
Unrealized Losses (2,641) (4,637)
Fair Value 144,872 144,280
Single Issue Trust Preferred Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 55,778 55,764
Unrealized Losses (9,649) (9,530)
Fair Value 46,129 46,234
Mortgage-backed securities Agency
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 271,524 306,319
Unrealized Gains 2,332 2,575
Unrealized Losses (6,567) (8,508)
Fair Value 267,289 300,386
Mortgage-backed securities Non-Agency Alt-A residential
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 12,110 12,543
Unrealized Losses (1,838) (2,754)
Fair Value 10,272 9,789
OTTI in AOCI (1,838) [1] (2,754) [1]
Total Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 283,634 318,862
Unrealized Gains 2,332 2,575
Unrealized Losses (8,405) (11,262)
Fair Value 277,561 310,175
OTTI in AOCI (1,838) [1] (2,754) [1]
Equity Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 733 5,259
Unrealized Gains 318 24
Unrealized Losses (13) (36)
Fair Value 1,038 5,247
US Treasury Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,715 9,708
Unrealized Losses (451) (695)
Fair Value 9,264 9,013
Corporate securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 5,000 5,000
Unrealized Losses   (129)
Fair Value $ 5,000 $ 4,871
[1] Other-than-temporary impairment in accumulated other comprehensive income