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Debt Securities - Amortized Cost and Estimated Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Face Amount   $ 188,643
Amortized cost   190,178
Gross Unrealized Gain   2,313
Gross Unrealized Loss   (1,043)
Securities available-for-sale, Carrying Value   191,448
Total, Face Amount 676,545  
Total, Amortized Cost Basis 665,443  
Total, Gross Unrealized Gain 7,306  
Total, Gross Unrealized Loss (1,131)  
Total, Carrying Amount 671,618  
Commercial Mortgage Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Face Amount 17,777 33,066
Amortized cost 18,673 34,232
Gross Unrealized Gain 0 0
Gross Unrealized Loss (754) (870)
Securities available-for-sale, Carrying Value 17,919 33,362
Held-to-Maturity, Face Amount 155,000  
Held to Maturity - Amortized Cost 153,998  
Held-to-Maturity, Gross Unrealized Gain 0  
Held-to-Maturity, Gross Unrealized Loss 0  
Held-to-Maturity, Carrying Value 153,998  
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Face Amount 503,768 155,577
Amortized cost 492,772 155,946
Gross Unrealized Gain 7,306 2,313
Gross Unrealized Loss (377) (173)
Securities available-for-sale, Carrying Value $ 499,701 $ 158,086