Note 7 - Goodwill and Identifiable Intangible Assets (Detail) - Gross carrying amount of intangible assets and accumulated amortization (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Gross Carrying Amount	$ 67,108	$ 67,108
Accumulated Amortization	(43,847)	(38,479)
Core Deposits [Member]
Gross Carrying Amount	56,808	56,808
Accumulated Amortization	(34,938)	(30,070)
Mechant Draft Processing [Member]
Gross Carrying Amount	10,300	10,300
Accumulated Amortization	$ (8,909)	$ (8,409)