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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Face Amount $ 343,596 $ 188,643
Amortized cost 339,724 190,178
Gross Unrealized Gain 9,143 2,313
Gross Unrealized Loss (862) (1,043)
Securities available-for-sale, at estimated fair value 348,005 191,448
Commercial Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Face Amount 23,097 33,066
Amortized cost 24,074 34,232
Gross Unrealized Gain 0 0
Gross Unrealized Loss (793) (870)
Securities available-for-sale, at estimated fair value 23,281 33,362
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Face Amount 320,499 155,577
Amortized cost 315,650 155,946
Gross Unrealized Gain 9,143 2,313
Gross Unrealized Loss (69) (173)
Securities available-for-sale, at estimated fair value $ 324,724 $ 158,086