Accrued Interest Receivable and Other Assets - Details of Accrued Interest Receivable and Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Interest Receivable And Other Assets [Abstract]
Other real estate owned	$ 1,650	$ 1,607
Accrued interest receivable	6,262	6,747
Accrued income and other receivables	3,539	2,105
Fair market value of derivative financial instruments	346	1,547
Prepaid FDIC insurance assessments		2,426
Other prepaid expenses	9,624	6,004
Federal Reserve Bank stock, Federal Home Loan Bank stock and other not readily marketable equity securities	6,632	7,469
Net federal deferred tax assets	12,335	11,650
Other		624
Total accrued interest receivable and other assets	$ 40,388	$ 40,179