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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Commercial Mortgage Backed Securities [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Mar. 31, 2012
Commercial Mortgage Backed Securities [Member]
Jun. 30, 2012
Commercial Mortgage Backed Securities [Member]
Hilton Commercial Mortgage Backed Securities [Member]
Dec. 31, 2013
Commercial Mortgage Backed Securities [Member]
Portion at Fair Value Measurement [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Portion at Fair Value Measurement [Member]
AAA Commercial Mortage Backed Securities [Member]
Dec. 31, 2012
Commercial Mortgage Backed Securities [Member]
Portion at Fair Value Measurement [Member]
Hilton Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]                  
Face Amount $ 188,643 $ 273,343 $ 33,066 $ 65,410   $ 74,854 $ 155,577 $ 134,694 $ 73,239
Amortized cost 190,178 273,713 34,232 67,109 137,423   155,946 136,354 70,250
Gross Unrealized Gain 2,313 5,621 0 249     2,313 2,061 3,311
Gross Unrealized Loss (1,043) (446) (870) (279)     (173) (167) 0
Securities available-for-sale, at estimated fair value $ 191,448 $ 278,888 $ 33,362 $ 67,079     $ 158,086 $ 138,248 $ 73,561