Note 10 - Fair Value of Financial Instruments (Detail) - Level 3 fair value reconciliation: (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
REMIC And CMO [Member]
Assets, carried at fair value on a recurring basis classified within Level 3	$ 23,475
Changes in unrealized held at period end	286
Change in unrealized gains (losses) included in other comprehensive income	286
Assets, carried at fair value on a recurring basis classified within Level 3	23,761
Municipal [Member]
Assets, carried at fair value on a recurring basis classified within Level 3	9,429
Changes in unrealized held at period end	(51)
Change in unrealized gains (losses) included in other comprehensive income	(51)
Assets, carried at fair value on a recurring basis classified within Level 3	9,378
Trust Preferred Securities [Member]
Assets, carried at fair value on a recurring basis classified within Level 3	6,650
Changes in unrealized held at period end	530
Net gain from fair value adjustment of financial assets	247
Change in unrealized gains (losses) included in other comprehensive income	530
Assets, carried at fair value on a recurring basis classified within Level 3	7,427
Junior subordinated debentures [Member]
Liabilities, carried at fair value on a recurring basis classified within Level 3	23,922
Net loss from fair value adjustment of financial liabilities	819
Increase in accrued interest payable	1
Liabilities, carried at fair value on a recurring basis classified within Level 3	$ 24,742