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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 54 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2013
Mar. 31, 2013
Jun. 30, 2009
Dec. 31, 2013
Trust
Segment
Dec. 31, 2012
Jun. 30, 2013
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2013
Tri Counties Bank [Member]
Branches
Sep. 30, 2013
Change in Accounting Method Accounted for as Change in Estimate [Member]
Dec. 31, 2013
Furniture and equipment [Member]
Minimum [Member]
Dec. 31, 2013
Furniture and equipment [Member]
Maximum [Member]
Dec. 31, 2013
Land improvements and buildings [Member]
Minimum [Member]
Dec. 31, 2013
Land improvements and buildings [Member]
Maximum [Member]
Mar. 31, 2012
Impaired real estate collateral dependent loans [Member]
Jun. 30, 2013
Impaired real estate collateral dependent loans [Member]
Mar. 31, 2013
Impaired real estate collateral dependent loans [Member]
Significant Of Accounting Policies [Line Items]                                      
Number of traditional operating branches                     41                
Number of in-store operating branches                     22                
Number of subsidiary business trusts       2                              
Company's investments in the trusts $ 1,238,000     $ 1,238,000                              
Number of business segment       1                              
Investment securities held to maturity 240,504,000 0   240,504,000 0                            
Trading securities 0     0 0                            
Recognized OTTI losses       0 0                            
Loans contractual past due       90 days                              
TDR loans payment period in nonaccrual status       6 months                              
Net reduction calculated allowance for loan losses                                 1,388,000    
Method used to estimate net sale proceeds   Greater of fifteen percent or actual estimated selling costs                                  
Allowance for loan losses 38,245,000     38,245,000 42,648,000   45,914,000 42,571,000       1,665,000           1,314,000 494,000
Allowance for loss factor weighted percentage 125.00%   75.00%           75.00% 125.00%                  
Estimated useful lives of the related assets or lease terms                         3 years 10 years 15 years 40 years      
Reserve for unfunded commitments due to change in methodology           $ 335,000