Note 4 - Loans and Allowance for Loan Losses (Details) - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year: (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	$ 29,028,000		$ 27,442,000
Period-end amount allocated to:
Provision for loan losses	7,245,000		4,118,000		4,140,000
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	6,962,000	[1]	3,205,000	[1]	3,446,000	2,063,000
Period-end amount allocated to:
Loans individually evaluated for impairment	185,000		93,000
Loans collectively evaluated for impairment	6,777,000		3,112,000
Provision for loan losses	4,475,000	[1]	(51,000)		1,756,000
Charge-offs	(1,044,000)		(382,000)		(543,000)
Recoveries	326,000		192,000		170,000
Net charge-offs	(718,000)		(190,000)		(373,000)
Real Estate Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	15,161,000	[1]	16,885,000	[1]	15,453,000	10,117,000
Period-end amount allocated to:
Loans individually evaluated for impairment	1,756,000		1,680,000
Loans collectively evaluated for impairment	13,405,000		15,205,000
Provision for loan losses	(606,000)	[1]	2,468,000		8,048,000
Charge-offs	(2,684,000)		(1,628,000)		(4,095,000)
Recoveries	1,566,000		592,000		1,383,000
Net charge-offs	(1,118,000)		(1,036,000)		(2,712,000)
Credit Cards [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	5,445,000	[1]	5,430,000	[1]	7,211,000	5,513,000
Period-end amount allocated to:
Loans individually evaluated for impairment	6,000		16,000
Loans collectively evaluated for impairment	5,439,000		5,414,000
Provision for loan losses	2,307,000	[1]	581,000		4,356,000
Charge-offs	(3,188,000)		(3,263,000)		(3,516,000)
Recoveries	896,000		901,000		858,000
Net charge-offs	(2,292,000)		(2,362,000)		(2,658,000)
Other Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	1,460,000	[1]	1,922,000	[1]	1,772,000	1,847,000
Period-end amount allocated to:
Loans individually evaluated for impairment	118,000		171,000
Loans collectively evaluated for impairment	1,342,000		1,751,000
Provision for loan losses	706,000	[1]	1,120,000		548,000
Charge-offs	(1,638,000)		(1,561,000)		(1,198,000)
Recoveries	470,000		591,000		575,000
Net charge-offs	(1,168,000)		(970,000)		(623,000)
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance		[1]		[1]		10,568,000
Period-end amount allocated to:
Provision for loan losses		[1]			(10,568,000)
Total Excluding Loans Acquired [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance	29,028,000	[1]	27,442,000	[1]	27,882,000	30,108,000
Period-end amount allocated to:
Loans individually evaluated for impairment	2,065,000		1,960,000
Loans collectively evaluated for impairment	26,963,000		25,482,000
Provision for loan losses	6,882,000	[1]	4,118,000		4,140,000
Charge-offs	(8,554,000)		(6,834,000)		(9,352,000)
Recoveries	3,258,000		2,276,000		2,986,000
Net charge-offs	$ (5,296,000)		$ (4,558,000)		$ (6,366,000)

[1] Provision for loan losses of $363,000 attributable to acquired loans, covered by FDIC loss share, was excluded from this table (total provision for loan losses for 2014 is $7,245,000). The gross provision for loans losses on covered loans was $954,000, offset by a $591,000 adjustment to the FDIC indemnification asset. The total allowance for loan losses at December 31, 2014, including $954,000 for covered loans, was $29,982,000.