Fair Value Measurement of Assets and Liabilities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Transfer of loans to loans held for sale	$ 27,329,000	$ 0
Allowance for loan losses	6,100,000
Impaired collateral dependent loans, charge-offs	1,000,000
Collateral dependent impaired loans, recorded investment	19,100,000
Specific valuation allowance allocations	3,000,000
Reported net carrying amount of impaired loans	16,100,000
Valuation of loan servicing rights, discount rate	8.00%
Net recoveries of impairment charges	100,000
Foreclosed assets measured at fair value upon initial recognition	19,600,000
Allowance for loan losses, charge-offs	1,500,000
Loss due to re-measurement of repossessed assets	1,800,000
Minimum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation of loan servicing rights, prepayment rate	0.00%
Maximum [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation of loan servicing rights, prepayment rate	26.00%
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate on impaired loans	22.00%
Available-for-sale Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Changes in unrealized losses on Level 3 securities	0	0
Impaired trust preferred securities ,fair value	26,911,000	77,920,000	28,523,000	71,674,000
Non-Performing Loans [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Transfer of loans to loans held for sale	35,600,000
Non-Performing Loans [Member] | Carrying Amount [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Transfer of loans to loans held for sale	22,100,000
Non-Performing Loans [Member] | Changes Measurement [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Transfer of loans to loans held for sale	8,300,000
Non-Performing Loans [Member] | Fair Value [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Transfer of loans to loans held for sale	$ 13,800,000