Note 10 - Fair Value of Financial Instruments (Detail) - Quantitative information about recurring Level 3 fair value of financial instruments and the fair value measurements: (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Assets, recurring [Member] | Minimum [Member]
Range	2.40%
Junior subordinated debentures	2.40%
Assets, recurring [Member] | Maximum [Member]
Range	4.10%
Junior subordinated debentures	4.10%
Assets, recurring [Member]
Unobservable Input	Spread to index
Weighted Average	(3.30%)
Junior subordinated debentures	Spread to index
Junior subordinated debentures	(3.30%)
REMIC And CMO [Member] | Minimum [Member]
Range	4.40%
Junior subordinated debentures	4.40%
REMIC And CMO [Member] | Maximum [Member]
Range	7.60%
Junior subordinated debentures	7.60%
REMIC And CMO [Member]
Fair Value (in Dollars)	$ 23,761	$ 23,475
Valuation Technique	Discounted cash flows
Unobservable Input	Average Life (years)
Weighted Average	(5.60%)
Junior subordinated debentures	Discounted cash flows
Junior subordinated debentures	Average Life (years)
Junior subordinated debentures	(5.60%)
Municipal [Member] | Minimum [Member]
Range	0.40%
Junior subordinated debentures	0.40%
Municipal [Member] | Maximum [Member]
Range	4.00%
Junior subordinated debentures	4.00%
Municipal [Member]
Fair Value (in Dollars)	9,378	9,429
Valuation Technique	Discounted cash flows
Unobservable Input	Discount rate
Weighted Average	(3.60%)
Junior subordinated debentures	Discounted cash flows
Junior subordinated debentures	Discount rate
Junior subordinated debentures	(3.60%)
Municipal - 1 [Member] | Minimum [Member]
Range	8.00%
Junior subordinated debentures	8.00%
Municipal - 1 [Member] | Maximum [Member]
Range	16.90%
Junior subordinated debentures	16.90%
Municipal - 1 [Member]
Unobservable Input	Discount rate
Weighted Average	(11.90%)
Junior subordinated debentures	Discount rate
Junior subordinated debentures	(11.90%)
Municipal - 2 [Member] | Minimum [Member]
Range	0.00%
Junior subordinated debentures	0.00%
Municipal - 2 [Member] | Maximum [Member]
Range	73.00%
Junior subordinated debentures	73.00%
Municipal - 2 [Member]
Unobservable Input	Prepayment assumptions
Weighted Average	(45.60%)
Junior subordinated debentures	Prepayment assumptions
Junior subordinated debentures	(45.60%)
Trust Preferred Securities [Member] | Minimum [Member]
Range	0.00%
Junior subordinated debentures	0.00%
Trust Preferred Securities [Member] | Maximum [Member]
Range	10.30%
Junior subordinated debentures	10.30%
Trust Preferred Securities [Member]
Fair Value (in Dollars)	7,427	6,650
Valuation Technique	Discounted cash flows
Unobservable Input	Defaults
Weighted Average	(7.60%)
Junior subordinated debentures	Discounted cash flows
Junior subordinated debentures	Defaults
Junior subordinated debentures	(7.60%)
Junior subordinated debentures [Member] | Minimum [Member]
Range	8.00%
Junior subordinated debentures	8.00%
Junior subordinated debentures [Member] | Maximum [Member]
Range	8.00%
Junior subordinated debentures	8.00%
Junior subordinated debentures [Member]
Valuation Technique	Discounted cash flows
Unobservable Input	Discount rate
Weighted Average	(8.00%)
Junior subordinated debentures (in Dollars)	$ 24,742	$ 23,922
Junior subordinated debentures	Discounted cash flows
Junior subordinated debentures	Discount rate
Junior subordinated debentures	(8.00%)