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Note 8 - Loans and Allowance for Loan Losses (Details) - Impaired Loans - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
With no specific allowance recorded:    
Recorded investment - with no specific allowance $ 10,284 $ 19,019
Unpaid principal balance - with no specific allowance 11,440 20,485
With an allowance recorded:    
Recorded investment - wth an allowance 1,770 2,058
Unpaid principal balance - with an allowance 2,274 2,359
Related allowance 867 1,194
Total:    
Recorded investment 12,054 21,077
Unpaid principal balance 13,714 22,844
Related allowance 867 1,194
Average recorded investment 16,684 25,768
Interest income recognized 297 683
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans [Member]    
With no specific allowance recorded:    
Recorded investment - with no specific allowance 3,169 5,894
Unpaid principal balance - with no specific allowance 3,373 6,056
With an allowance recorded:    
Recorded investment - wth an allowance 1,019 1,221
Unpaid principal balance - with an allowance 1,210 1,419
Related allowance 745 1,095
Total:    
Recorded investment 4,188 7,115
Unpaid principal balance 4,583 7,475
Related allowance 745 1,095
Average recorded investment 6,301 9,305
Interest income recognized 154 331
Commercial Portfolio Segment [Member] | Construction Loans [Member]    
With no specific allowance recorded:    
Recorded investment - with no specific allowance 346 362
Unpaid principal balance - with no specific allowance 347 444
Total:    
Recorded investment 346 362
Unpaid principal balance 347 444
Average recorded investment 410 1,050
Interest income recognized 16 2
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]    
With no specific allowance recorded:    
Recorded investment - with no specific allowance 5,244 11,546
Unpaid principal balance - with no specific allowance 5,700 12,198
Total:    
Recorded investment 5,244 11,546
Unpaid principal balance 5,700 12,198
Average recorded investment 7,881 12,304
Interest income recognized 121 344
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]    
With no specific allowance recorded:    
Recorded investment - with no specific allowance 997 903
Unpaid principal balance - with no specific allowance 1,433 1,427
With an allowance recorded:    
Recorded investment - wth an allowance 446 664
Unpaid principal balance - with an allowance 753 748
Related allowance 89 91
Total:    
Recorded investment 1,443 1,567
Unpaid principal balance 2,186 2,175
Related allowance 89 91
Average recorded investment 1,522 2,452
Finance Leases Portfolio Segment [Member]    
With no specific allowance recorded:    
Recorded investment - with no specific allowance 104 16
Unpaid principal balance - with no specific allowance 104 16
Total:    
Recorded investment 104 16
Unpaid principal balance 104 16
Average recorded investment 22 26
Interest income recognized 1 1
Retail Portfolio Segment [Member] | 1-4 Family Residential Mortgages [Member]    
With no specific allowance recorded:    
Recorded investment - with no specific allowance 242 225
Unpaid principal balance - with no specific allowance 253 250
With an allowance recorded:    
Recorded investment - wth an allowance 305 116
Unpaid principal balance - with an allowance 311 116
Related allowance 33 4
Total:    
Recorded investment 547 341
Unpaid principal balance 564 366
Related allowance 33 4
Average recorded investment 415 460
Interest income recognized 4 5
Retail Portfolio Segment [Member] | Home Equity Loan [Member]    
With no specific allowance recorded:    
Recorded investment - with no specific allowance 155 72
Unpaid principal balance - with no specific allowance 203 93
With an allowance recorded:    
Recorded investment - wth an allowance   57
Unpaid principal balance - with an allowance   76
Related allowance   4
Total:    
Recorded investment 155 129
Unpaid principal balance 203 169
Related allowance   4
Average recorded investment 130 169
Interest income recognized 1  
Retail Portfolio Segment [Member] | Consumer Loans [Member]    
With no specific allowance recorded:    
Recorded investment - with no specific allowance 27 1
Unpaid principal balance - with no specific allowance 27 1
Total:    
Recorded investment 27 1
Unpaid principal balance 27 1
Average recorded investment $ 3 $ 2