Loans Receivable and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Borrowers SecurityLoan TDRs	Jun. 30, 2013	Dec. 31, 2013 Borrowers SecurityLoan TDRs	May 30, 2014 Team Capital Bank [Member]	Jun. 30, 2014 Impaired Loans - Trouble Debt Restructurings [Member]	Jun. 30, 2013 Impaired Loans - Trouble Debt Restructurings [Member]	Jun. 30, 2014 Impaired Loans - Trouble Debt Restructurings [Member]	Jun. 30, 2013 Impaired Loans - Trouble Debt Restructurings [Member]	Jun. 30, 2014 With Related Allowance For Loan Losses [Member]	Dec. 31, 2013 With Related Allowance For Loan Losses [Member]	Jun. 30, 2014 No Allowance for Loan Losses Required [Member]	Dec. 31, 2013 No Allowance for Loan Losses Required [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of acquired loans						$ 5,220,000
Principal amount of nonaccrual loans	65,400,000		65,400,000		76,700,000
Loans less than 90 days past due	27,000,000		27,000,000		33,500,000
Impaired loan defined floor limit	1,000,000		1,000,000
Impaired loans number			155		152
Impaired loans	93,839,000		93,839,000		106,370,000
Number of troubled debt restructurings			117		115
Number of borrowers			114		110
Loans and leases receivable, impaired, nonperforming, accrual of interest	55,600,000		55,600,000		58,200,000
Allowances for loan losses							282,000	294,000	322,000	670,000
Weighted average modified interest rate	4.81%	4.20%	4.65%	4.24%
Weighted average prior modification rate	5.50%	5.49%	5.39%	5.67%
Allowances for loan losses	8,521,000		8,521,000		10,217,000						8,521,000	10,217,000
Impaired financing receivable with no related allowance													20,108,000	21,958,000
Average balance of impaired loans			$ 96,462,000