Fair Value Measurement - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair Value Measurements Disclosure [Line Items]
Derivative instrument maximum maturity period	30 years
Transfer between level 1 and level 2 due to in the valuation of interest rate caps are back-tested	$ 0		$ 0
Transfer between level 2 and level 3 due to reconciliation of all assets measured at fair value on a recurring basis	0	0
Fair value of the collateral dependent loans, net carrying amount	2,700,000	16,200,000	4,100,000
Increase (Decrease) in provision for loan losses	469,000	2,900,000	1,500,000
Specific allowance for collateral dependent loans	959,000	3,400,000	792,000
Discount applied to appraisals for estimated selling costs percentage	10.00%
Mortgage servicing rights, fair amount	103,000	5,900,000	0
Valuation allowance	(1,000)	435,000
Mortgage servicing rights net recovery/charge			680,000
Mortgage servicing rights, Outstanding Amount		6,100,000
Other real estate owned carried at fair value	3,400,000	8,800,000	4,200,000
Valuation allowance related to other real estate owned	3,600,000	6,200,000	4,100,000
Additional expenses related to other real estate owned	292,000	323,000	2,000,000
Maximum maturity period of short term borrowings	90 days
Minimum [Member]
Fair Value Measurements Disclosure [Line Items]
Increase in fair value	$ 250,000