Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	$ 616,256	$ 612,820
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	97,230	93,750
US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
US Government-sponsored Enterprises Debt Securities [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	97,230	93,750
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	133,281	131,970
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
US States and Political Subdivisions Debt Securities [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	133,281	131,970
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	377,519	378,077
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
Residential Mortgage Backed Securities [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	377,519	378,077
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	715	689
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
Commercial Mortgage Backed Securities [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	715	689
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	6,492	6,257
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
Corporate Debt Securities [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	6,492	6,257
Mutual Funds And Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	1,019	2,077
Mutual Funds And Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
Mutual Funds And Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	0	0
Mutual Funds And Equity Securities [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	1,019	2,077
Fair Value, Inputs, Level 1 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	1,019	2,077
Fair Value, Inputs, Level 2 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	615,237	610,743
Fair Value, Inputs, Level 3 [Member]
Note 11 - Fair Value Measurements (Details) - Available For Sale Investment Securities Measured At Fair Value On A Recurring Basis [Line Items]
Available For Sale Investment Securities	$ 0	$ 0