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Note 14 - Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Balance $ 559,559,000 $ 549,464,000 $ 535,307,000 $ 532,608,000 $ 549,464,000 $ 532,608,000
Total other comprehensive income (loss), net of tax (74,000) 2,210,000 (832,000) (895,000) 2,136,000 (1,727,000)
Balance 565,390,000 559,559,000 538,044,000 535,307,000 565,390,000 538,044,000
Reclassification of the Income tax effects of Tax Cuts and Jobs Act from AOCI to Retained Earnings       0    
Impact of adoption of Accounting Standard Update 2016-01     0 0    
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]            
Balance (10,029,000) (15,649,000) (13,487,000) (5,522,000) (15,649,000) (5,522,000)
Other comprehensive income before reclassifications, net of tax 6,204,000   (3,014,000)   11,824,000 (9,654,000)
Amounts reclassified from accumulated other comprehensive income, net of tax 10,000   0   10,000 0
Total other comprehensive income (loss), net of tax 6,214,000   (3,014,000)   11,834,000 (9,654,000)
Balance (3,815,000) (10,029,000) (16,501,000) (13,487,000) (3,815,000) (16,501,000)
Reclassification of the Income tax effects of Tax Cuts and Jobs Act from AOCI to Retained Earnings           (1,325,000)
Impact of adoption of Accounting Standard Update 2016-01           0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]            
Balance 199,000 3,704,000 5,942,000 231,000 3,704,000 231,000
Other comprehensive income before reclassifications, net of tax (5,884,000)   1,898,000   (9,250,000) 7,505,000
Amounts reclassified from accumulated other comprehensive income, net of tax (447,000)   187,000   (586,000) 241,000
Total other comprehensive income (loss), net of tax (6,331,000)   2,085,000   (9,836,000) 7,746,000
Balance (6,132,000) 199,000 8,027,000 5,942,000 (6,132,000) 8,027,000
Reclassification of the Income tax effects of Tax Cuts and Jobs Act from AOCI to Retained Earnings           50,000
Impact of adoption of Accounting Standard Update 2016-01           0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Balance (1,666,000) (1,673,000) (4,409,000) (3,695,000) (1,673,000) (3,695,000)
Other comprehensive income before reclassifications, net of tax 0   0   0 0
Amounts reclassified from accumulated other comprehensive income, net of tax 8,000   84,000   15,000 168,000
Total other comprehensive income (loss), net of tax 8,000   84,000   15,000 168,000
Balance (1,658,000) (1,666,000) (4,325,000) (4,409,000) (1,658,000) (4,325,000)
Reclassification of the Income tax effects of Tax Cuts and Jobs Act from AOCI to Retained Earnings           (798,000)
Impact of adoption of Accounting Standard Update 2016-01           0
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]            
Balance 954,000 866,000 779,000 0 866,000 0
Other comprehensive income before reclassifications, net of tax 35,000   13,000   123,000 13,000
Amounts reclassified from accumulated other comprehensive income, net of tax 0   0   0 0
Total other comprehensive income (loss), net of tax 35,000   13,000   123,000 13,000
Balance 989,000 954,000 792,000 779,000 989,000 792,000
Reclassification of the Income tax effects of Tax Cuts and Jobs Act from AOCI to Retained Earnings           0
Impact of adoption of Accounting Standard Update 2016-01           779,000
AOCI Attributable to Parent [Member]            
Balance (10,542,000) (12,752,000) (11,179,000) (8,986,000) (12,752,000) (8,986,000)
Other comprehensive income before reclassifications, net of tax 355,000   (1,103,000)   2,697,000 (2,136,000)
Amounts reclassified from accumulated other comprehensive income, net of tax (429,000)   271,000   (561,000) 409,000
Total other comprehensive income (loss), net of tax (74,000) 2,210,000 (832,000) (895,000) 2,136,000 (1,727,000)
Balance $ (10,616,000) $ (10,542,000) (12,007,000) (11,179,000) $ (10,616,000) (12,007,000)
Reclassification of the Income tax effects of Tax Cuts and Jobs Act from AOCI to Retained Earnings       (2,073,000)   (2,073,000)
Impact of adoption of Accounting Standard Update 2016-01     $ 4,000 $ 775,000   $ 779,000