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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost within one year $ 4,623 $ 3,643
Amortized cost one to five years 45,741 49,198
Amortized cost for five to ten years 17,166 106,225
Amortized cost for after ten years 6,601 62,120
Total amortized cost 74,131 221,186
Total available for sale investment securities, Amortized Cost 321,203 508,427
Within one year, amortized cost 5,951 9,910
One to five years, amortized cost 381  
Five to ten years, amortized cost 93,628  
After ten years, amortized cost 45,662  
Total amortized cost 145,622 9,910
Total held to maturity investment securities, amortized cost 172,449 9,910
Fair value within one year 4,670 3,663
Fair value for one to five years 46,156 49,627
Fair value for five to ten years 17,888 107,424
Fair value for after ten years 6,755 61,051
Total fair value 75,469 221,765
Investment securities, available for sale 323,492 508,591
Within one year, fair value 6,136 9,910
One to five years, fair value 382  
five to ten years, fair value 95,216  
After ten years, fair value 46,869  
Total fair value 148,603 9,910
Held-to-maturity, Fair Value 175,838 9,910
Federal Agency Collateralized Mortgage Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 123,916 116,047
Total held to maturity investment securities, amortized cost 4,193  
Investment securities, available for sale 123,128 114,706
Held-to-maturity, Fair Value 4,202  
Federal Agency Mortgage-backed Pools [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 122,393 170,006
Total held to maturity investment securities, amortized cost 22,634  
Investment securities, available for sale 124,109 170,894
Held-to-maturity, Fair Value 23,033  
Private Labeled Mortgage-backed Pools [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 763 1,188
Investment securities, available for sale $ 786 $ 1,226