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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Face Amount $ 171,778 $ 188,643
Amortized cost 173,174 190,178
Gross Unrealized Gain 4,432 2,313
Gross Unrealized Loss (995) (1,043)
Securities available-for-sale, at estimated fair value 176,611 191,448
Commercial Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Face Amount 25,281 33,066
Amortized cost 26,364 34,232
Gross Unrealized Gain 0 0
Gross Unrealized Loss (887) (870)
Securities available-for-sale, at estimated fair value 25,477 33,362
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Face Amount 146,497 155,577
Amortized cost 146,810 155,946
Gross Unrealized Gain 4,432 2,313
Gross Unrealized Loss (108) (173)
Securities available-for-sale, at estimated fair value $ 151,134 $ 158,086