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Acquisition Activity - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Jul. 15, 2011
GS Financial Corp [Member]
Branch
Dec. 31, 2013
GS Financial Corp [Member]
Mar. 12, 2010
Statewide Bank [Member]
Branch
Dec. 31, 2013
Statewide Bank [Member]
Business Acquisition [Line Items]            
Shareholders received per share in cash     $ 21.00      
Aggregate purchase price     $ 26,417,000      
Assets acquired     256,677,000   188,026,000  
Loans included in acquired assets     182,440,000   110,415,000  
Investment securities included in acquired assets     46,481,000   24,841,000  
Cash included in acquired assets     9,262,000   11,569,000  
Core deposit intangible asset recorded     859,000   1,429,000  
Goodwill recorded 856,000 856,000 296,000   560,000  
Liabilities assumed     230,614,000   223,910,000  
Deposits included in assumed liabilities     193,518,000   206,925,000  
Federal Home Loan Bank advances     34,707,000   16,824,000  
Number of branches added     4      
Nonaccretable difference     5,490,000      
Weighted average remaining contractual life       8 years 2 months 12 days   3 years 9 months 18 days
FDIC loss sharing receivable 12,698,077 15,545,893     34,422,000  
Number of branches expanded         6  
Cash Flows from covered loans       $ 3,578,000