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Note 5 - Loans and Allowance for Loan Losses - Impaired Loans, Net of Government Guarantees and Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unpaid Contractual Principal Balance | $ 57,334,000 | $ 54,521,000 |
Recorded Investment With No Allowance | 30,920,000 | 24,678,000 |
Recorded Investment With Allowance | 13,003,000 | 19,018,000 |
Impaired Financing Receivable, Recorded Investment | 43,923,000 | 43,696,000 |
Impaired Financing Receivable, Related Allowance | 338,000 | 680,000 |
Average Investment in Impaired Loans | 50,788,000 | 35,978,000 | $ 16,700,000
Interest Income Recognized | 1,780,000 | 1,593,000 | $ 1,200,000
Consumer Portfolio Segment [Member] |  |  |
Unpaid Contractual Principal Balance | 4,925,000 | 2,209,000 |
Recorded Investment With No Allowance | 4,775,000 | 2,170,000 |
Recorded Investment With Allowance |  | 3,000 |
Impaired Financing Receivable, Recorded Investment | 4,775,000 | 2,173,000 |
Impaired Financing Receivable, Related Allowance |  | 1,000 |
Average Investment in Impaired Loans | 3,357,000 | 1,412,000 |
Interest Income Recognized | 153,000 | 67,000 |
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] |  |  |
Unpaid Contractual Principal Balance | 170,000 | 373,000 |
Recorded Investment With No Allowance | 170,000 | 373,000 |
Recorded Investment With Allowance |  |  |
Impaired Financing Receivable, Recorded Investment | 170,000 | 373,000 |
Impaired Financing Receivable, Related Allowance |  |  |
Average Investment in Impaired Loans | 268,000 | 346,000 |
Interest Income Recognized | 47,000 | 20,000 |
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |
Unpaid Contractual Principal Balance | 4,755,000 | 1,836,000 |
Recorded Investment With No Allowance | 4,605,000 | 1,797,000 |
Recorded Investment With Allowance |  | 3,000 |
Impaired Financing Receivable, Recorded Investment | 4,605,000 | 1,800,000 |
Impaired Financing Receivable, Related Allowance |  | 1,000 |
Average Investment in Impaired Loans | 3,089,000 | 1,066,000 |
Interest Income Recognized | 106,000 | 47,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Unpaid Contractual Principal Balance | 39,177,000 | 38,238,000 |
Recorded Investment With No Allowance | 20,804,000 | 18,559,000 |
Recorded Investment With Allowance | 10,734,000 | 11,442,000 |
Impaired Financing Receivable, Recorded Investment | 31,538,000 | 30,001,000 |
Impaired Financing Receivable, Related Allowance | 338,000 | 417,000 |
Average Investment in Impaired Loans | 34,239,000 | 28,854,000 |
Interest Income Recognized | 1,175,000 | 1,274,000 |
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Unpaid Contractual Principal Balance | 2,522,000 | 4,275,000 |
Recorded Investment With No Allowance | 1,347,000 | 1,038,000 |
Recorded Investment With Allowance | 895,000 | 2,374,000 |
Impaired Financing Receivable, Recorded Investment | 2,242,000 | 3,412,000 |
Impaired Financing Receivable, Related Allowance | 249,000 | 156,000 |
Average Investment in Impaired Loans | 2,711,000 | 4,436,000 |
Interest Income Recognized | 93,000 | 196,000 |
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |  |
Unpaid Contractual Principal Balance | 14,347,000 | 12,970,000 |
Recorded Investment With No Allowance | 12,725,000 | 10,630,000 |
Recorded Investment With Allowance | 706,000 | 1,753,000 |
Impaired Financing Receivable, Recorded Investment | 13,431,000 | 12,383,000 |
Impaired Financing Receivable, Related Allowance | 53,000 | 162,000 |
Average Investment in Impaired Loans | 12,904,000 | 9,486,000 |
Interest Income Recognized | 443,000 | 419,000 |
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] |  |  |
Unpaid Contractual Principal Balance | 22,308,000 | 20,993,000 |
Recorded Investment With No Allowance | 6,732,000 | 6,891,000 |
Recorded Investment With Allowance | 9,133,000 | 7,315,000 |
Impaired Financing Receivable, Recorded Investment | 15,865,000 | 14,206,000 |
Impaired Financing Receivable, Related Allowance | 36,000 | 99,000 |
Average Investment in Impaired Loans | 18,624,000 | 14,932,000 |
Interest Income Recognized | 639,000 | 659,000 |
Commercial Portfolio Segment [Member] |  |  |
Unpaid Contractual Principal Balance | 13,232,000 | 14,074,000 |
Recorded Investment With No Allowance | 5,341,000 | 3,949,000 |
Recorded Investment With Allowance | 2,269,000 | 7,573,000 |
Impaired Financing Receivable, Recorded Investment | 7,610,000 | 11,522,000 |
Impaired Financing Receivable, Related Allowance |  | 262,000 |
Average Investment in Impaired Loans | 13,192,000 | 5,712,000 |
Interest Income Recognized | 452,000 | 252,000 |
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Unpaid Contractual Principal Balance | 9,954,000 | 11,848,000 |
Recorded Investment With No Allowance | 4,306,000 | 2,734,000 |
Recorded Investment With Allowance | 2,269,000 | 7,573,000 |
Impaired Financing Receivable, Recorded Investment | 6,575,000 | 10,307,000 |
Impaired Financing Receivable, Related Allowance |  | 262,000 |
Average Investment in Impaired Loans | 11,670,000 | 4,666,000 |
Interest Income Recognized | 400,000 | 206,000 |
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |
Unpaid Contractual Principal Balance | 3,278,000 | 2,226,000 |
Recorded Investment With No Allowance | 1,035,000 | 1,215,000 |
Recorded Investment With Allowance |  |  |
Impaired Financing Receivable, Recorded Investment | 1,035,000 | 1,215,000 |
Impaired Financing Receivable, Related Allowance |  |  |
Average Investment in Impaired Loans | 1,522,000 | 1,046,000 |
Interest Income Recognized | $ 52,000 | $ 46,000 |

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