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Note 4 - Loans and Allowance for Credit Losses (Details) (USD $)	3 Months Ended		12 Months Ended	3 Months Ended							3 Months Ended	12 Months Ended				3 Months Ended	12 Months Ended			12 Months Ended						3 Months Ended		12 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Nonaccrual Loans [Member]	Mar. 31, 2014 Nonaccrual Loans Current and in Accordance with Original Terms [Member]	Mar. 31, 2014 Migrated From Nonperforming Loans [Member] Nonperforming Financing Receivable [Member]	Mar. 31, 2014 Paid Off [Member]	Mar. 31, 2014 Performing Under Restructured Terms [Member]	Dec. 31, 2013 Performing Under Restructured Terms [Member]	Mar. 31, 2012 Performing Under Restructured Terms [Member]	Mar. 31, 2013 Commercial Real Estate Owner Occupied [Member]	Dec. 31, 2013 Commercial Real Estate Owner Occupied [Member]	Mar. 31, 2014 Commercial Real Estate Owner Occupied [Member]	Mar. 31, 2014 Excluding Owner Occupied Commercial Real Estate And Commercial Construction Loans [Member]	Mar. 31, 2014 Commercial Real Estate and Real Estate Construction Loans [Member]	Mar. 31, 2013 Commercial Loan [Member]	Dec. 31, 2013 Commercial Loan [Member]	Mar. 31, 2014 Commercial Loan [Member]	Mar. 31, 2014 SBA Loans [Member]	Dec. 31, 2013 Home Equity Line of Credit [Member]	Mar. 31, 2014 Home Equity Line of Credit [Member]	Mar. 31, 2013 Home Equity Line of Credit [Member]	Mar. 31, 2014 Residential Mortgage Loan Long-Term [Member]	Mar. 31, 2014 Commercial Land Acquisition Loans [Member]	Mar. 31, 2014 ADC Loans [Member]	Mar. 31, 2014 Construction Loans [Member]	Mar. 31, 2013 Construction Loans [Member]	Dec. 31, 2013 Construction Loans [Member]	Mar. 31, 2014 Nonperforming Financing Receivable [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Minimum [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) [Line Items]
Loans and Leases Receivable, Deferred Income	$ 13,600,000	$ 9,100,000	$ 12,700,000
Servicing Asset at Fair Value, Amount	74,100,000		67,600,000
Percent Of Loan Portfolio													11.00%	59.00%	70.00%			23.00%	1.00%		4.00%		3.00%
Loan To Value Ratio																														80.00%
Minimum Debt Service Coverage																														1.15
Interest Rate Adjustment Frequency	5 years
Length Of Loan																		10 years					5 years	24 months		36 months				7 years	5 years
Stress Test Assumption Increase Interest Rates	2.00%
Amortization Term																														25 years
Financing Receivable, Net	3,063,975,000		2,945,158,000									317,491,000	320,994,000				694,350,000	704,386,000		110,242,000	108,839,000				629,400,000	629,447,000		608,826,000
	100.00%	100.00%	100.00%																						48.00%
Impaired Financing Receivable, Recorded Investment	44,264,000	42,980,000	32,646,000								6,449,000	5,452,000	7,323,000			7,993,000	6,779,000	17,646,000		623,000	598,000	481,000				12,225,000	21,959,000	12,933,000	1,800,000
Impaired Financing Receivable, Unpaid Principal Balance	45,512,000	43,480,000	32,946,000								6,449,000	5,452,000	7,323,000			8,493,000	6,779,000	17,646,000		623,000	598,000	481,000				13,098,000	21,959,000	13,233,000	11,400,000
Financing Receivable, Modifications, Recorded Investment						2,300,000	217,000	7,900,000	7,900,000	14,800,000
Impaired Financing Receivable, Interest Income, Accrual Method	538,000	177,000	591,000		549,000						56,000	108,000				42,000	131,000			4,000						503,000	42,000	169,000
Impaired Financing Receivable, Interest Income, Cash Basis Method				461,000
Real Estate Owned, Transfer to Real Estate Owned																													2,000,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	95,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			$ 495,000
Financing Receivable, Modifications, Number of Contracts	0	0

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