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Business Combinations - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (Prosperity Banking Company [Member], USD $)
In Thousands, unless otherwise specified
0 Months Ended
Dec. 23, 2013
As Recorded by Acquired Bank [Member]
 
Business Acquisition [Line Items]  
Deferred tax asset, purchase accounting adjustments $ 8,435
Fair Value Adjustments [Member]
 
Business Acquisition [Line Items]  
Deferred tax asset, non-realizable portion (6,644)
Fair value adjustment of other assets (599)
Fair value adjustment (premium) to FHLB borrowings 12,741
Fair value adjustment to subordinated debt $ 428