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Note 11 - Fair Value Measurements (Details) - Assets and Liabilities Measured at Fair Value On a Recurring Basis - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment securities available for sale:
Available for Sale Securities	$ 560,236
Liabilities:
Liabilities measured at fair value on a recurring basis		$ 3,445
US Government Agencies Debt Securities [Member]
Investment securities available for sale:
Available for Sale Securities	69,078	29,894
Residential Mortgage Backed Securities [Member]
Investment securities available for sale:
Available for Sale Securities	322,020	240,320
US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale:
Available for Sale Securities	117,866	111,712
Corporate Debt Securities [Member]
Investment securities available for sale:
Available for Sale Securities	15,018
Equity Securities [Member]
Investment securities available for sale:
Available for Sale Securities	344	417
Loans Held for Sale Securities [Member]
Investment securities available for sale:
Available for Sale Securities	35,713	44,317
Mortgage Banking Derivative [Member]
Investment securities available for sale:
Available for Sale Securities	197	146
Interest Rate Swap [Member]
Investment securities available for sale:
Available for Sale Securities		426,806
Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis		3,445
Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale:
Available for Sale Securities	125
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Investment securities available for sale:
Available for Sale Securities	125	198
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Investment securities available for sale:
Available for Sale Securities		198
Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale:
Available for Sale Securities	559,695
Liabilities:
Liabilities measured at fair value on a recurring basis		3,445
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Investment securities available for sale:
Available for Sale Securities	69,078	29,894
Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Investment securities available for sale:
Available for Sale Securities	322,020	240,320
Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale:
Available for Sale Securities	117,866	111,712
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Investment securities available for sale:
Available for Sale Securities	15,018
Fair Value, Inputs, Level 2 [Member] | Loans Held for Sale Securities [Member]
Investment securities available for sale:
Available for Sale Securities	35,713	44,317
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Investment securities available for sale:
Available for Sale Securities		426,243
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Interest Rate Swap [Member]
Liabilities:
Liabilities measured at fair value on a recurring basis		3,445
Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale:
Available for Sale Securities	416
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Investment securities available for sale:
Available for Sale Securities	219	219
Fair Value, Inputs, Level 3 [Member] | Mortgage Banking Derivative [Member]
Investment securities available for sale:
Available for Sale Securities	$ 197	146
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Investment securities available for sale:
Available for Sale Securities		$ 365

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