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Note 12 - Borrowings - Short-term and Long-term Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Long-term borrowings $ 216,514 $ 68,928  
Year End [Member]      
Customer repurchase agreements and federal funds purchased, short term at year end $ 68,876 $ 72,356 $ 61,120
Customer repurchase agreements and federal funds purchased, short term at year end 0.35% 0.23% 0.25%
Federal Home Loan Bank – current portion, short term at year end $ 0 $ 0 $ 40,000
Federal Home Loan Bank – current portion, short term at year end 2.62%
Total, short term at year end $ 68,876 $ 72,356 $ 161,120
Subordinated Notes, long-term at year end $ 220,000 $ 70,000 $ 79,300
Subordinated Notes, long-term at year end 5.42% 5.75% 6.40%
Long-term borrowings $ 220,000 $ 70,000 $ 119,300
Year End [Member] | Current Portion [Member]      
Federal Home Loan Bank – current portion, short term at year end $ 100,000
Federal Home Loan Bank – current portion, short term at year end 0.38%
Average Daily Balance [Member]      
Customer repurchase agreements and federal funds purchased, short term at year end $ 77,833 $ 59,141 $ 63,490
Customer repurchase agreements and federal funds purchased, short term at year end 0.21% 0.22% 0.23%
Total, short term at year end $ 107,209 $ 86,800 $ 70,778
Subordinated Notes, long-term at year end $ 135,164 $ 74,117 $ 37,875
Subordinated Notes, long-term at year end 5.54% 6.06% 6.59%
Long-term borrowings $ 135,164 $ 82,446 $ 77,080
Federal Home Loan Bank, long-term average daily balance $ 0 $ 8,329 $ 39,205
Federal Home Loan Bank, long-term average daily balance 2.25% 2.00%
Average Daily Balance [Member] | Current Portion [Member]      
Federal Home Loan Bank – current portion, short term at year end $ 29,376 $ 27,659 $ 7,288
Federal Home Loan Bank – current portion, short term at year end 2.45% 0.31% 0.42%
Month End Balance [Member] | Maximum [Member]      
Customer repurchase agreements and federal funds purchased, short term at year end $ 136,689 $ 73,696 $ 80,471
Customer repurchase agreements and federal funds purchased, short term at year end 0.16% 0.21% 0.28%
Federal Home Loan Bank – current portion, short term at year end 0.37% 0.68%
Total, short term at year end $ 236,689 $ 213,696 $ 180,471
Subordinated Notes, long-term at year end $ 220,000 $ 79,300 $ 79,300
Subordinated Notes, long-term at year end 5.42% 6.52% 6.52%
Long-term borrowings $ 220,000 $ 119,300 $ 201,800
Federal Home Loan Bank, long-term maximum month-end balance 0 40,000 122,500
Month End Balance [Member] | Current Portion [Member] | Maximum [Member]      
Federal Home Loan Bank – current portion, short term at year end $ 100,000 $ 140,000 $ 100,000
Federal Home Loan Bank – current portion, short term at year end 0.94% 0.20% 0.38%