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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 ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Unpaid Contractual Principal Balance | $ 55,752,000 |  | $ 55,752,000 |  | $ 54,521,000
Recorded Investment With No Allowance | 31,223,000 |  | 31,223,000 |  | 24,678,000
Recorded Investment With Allowance | 20,586,000 |  | 20,586,000 |  | 19,018,000
Impaired Financing Receivable, Recorded Investment | 51,809,000 |  | 51,809,000 |  | 43,696,000
Impaired Financing Receivable, Related Allowance | 6,321,000 |  | 6,321,000 |  | 680,000
Average Investment in Impaired Loans | 54,468,000 | $ 42,121,000 | 52,504,000 | $ 34,048,000 |
Interest Income Recognized | 350,000 | 430,000 | 1,050,000 | 1,230,000 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 4,295,000 |  | 4,295,000 |  | 2,209,000
Recorded Investment With No Allowance | 4,153,000 |  | 4,153,000 |  | 2,170,000
Recorded Investment With Allowance |  |  |  |  | 3,000
Impaired Financing Receivable, Recorded Investment | 4,153,000 |  | 4,153,000 |  | 2,173,000
Impaired Financing Receivable, Related Allowance |  |  |  |  | 1,000
Average Investment in Impaired Loans | 3,597,000 | 1,763,000 | 3,003,000 | 1,222,000 |
Interest Income Recognized | 35,000 | 14,000 | 76,000 | 42,000 |
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 273,000 |  | 273,000 |  | 373,000
Recorded Investment With No Allowance | 273,000 |  | 273,000 |  | 373,000
Recorded Investment With Allowance |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 273,000 |  | 273,000 |  | 373,000
Impaired Financing Receivable, Related Allowance |  |  |  |  |
Average Investment in Impaired Loans | 283,000 | 439,000 | 292,000 | 340,000 |
Interest Income Recognized | 12,000 |  | 23,000 | 10,000 |
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 4,022,000 |  | 4,022,000 |  | 1,836,000
Recorded Investment With No Allowance | 3,880,000 |  | 3,880,000 |  | 1,797,000
Recorded Investment With Allowance |  |  |  |  | 3,000
Impaired Financing Receivable, Recorded Investment | 3,880,000 |  | 3,880,000 |  | 1,800,000
Impaired Financing Receivable, Related Allowance |  |  |  |  | 1,000
Average Investment in Impaired Loans | 3,314,000 | 1,324,000 | 2,711,000 | 882,000 |
Interest Income Recognized | 23,000 | 14,000 | 53,000 | 32,000 |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 35,499,000 |  | 35,499,000 |  | 38,238,000
Recorded Investment With No Allowance | 21,206,000 |  | 21,206,000 |  | 18,559,000
Recorded Investment With Allowance | 12,474,000 |  | 12,474,000 |  | 11,442,000
Impaired Financing Receivable, Recorded Investment | 33,680,000 |  | 33,680,000 |  | 30,001,000
Impaired Financing Receivable, Related Allowance | 2,325,000 |  | 2,325,000 |  | 417,000
Average Investment in Impaired Loans | 34,766,000 | 34,352,000 | 34,913,000 | 28,567,000 |
Interest Income Recognized | 223,000 | 341,000 | 687,000 | 1,034,000 |
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 2,652,000 |  | 2,652,000 |  | 4,275,000
Recorded Investment With No Allowance | 1,496,000 |  | 1,496,000 |  | 1,038,000
Recorded Investment With Allowance | 907,000 |  | 907,000 |  | 2,374,000
Impaired Financing Receivable, Recorded Investment | 2,403,000 |  | 2,403,000 |  | 3,412,000
Impaired Financing Receivable, Related Allowance | 220,000 |  | 220,000 |  | 156,000
Average Investment in Impaired Loans | 2,582,000 | 4,474,000 | 2,828,000 | 4,692,000 |
Interest Income Recognized | 17,000 | 44,000 | 56,000 | 170,000 |
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 13,782,000 |  | 13,782,000 |  | 12,970,000
Recorded Investment With No Allowance | 12,450,000 |  | 12,450,000 |  | 10,630,000
Recorded Investment With Allowance | 584,000 |  | 584,000 |  | 1,753,000
Impaired Financing Receivable, Recorded Investment | 13,034,000 |  | 13,034,000 |  | 12,383,000
Impaired Financing Receivable, Related Allowance | 53,000 |  | 53,000 |  | 162,000
Average Investment in Impaired Loans | 12,878,000 | 10,897,000 | 12,772,000 | 8,762,000 |
Interest Income Recognized | 85,000 | 119,000 | 251,000 | 317,000 |
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 19,065,000 |  | 19,065,000 |  | 20,993,000
Recorded Investment With No Allowance | 7,260,000 |  | 7,260,000 |  | 6,891,000
Recorded Investment With Allowance | 10,983,000 |  | 10,983,000 |  | 7,315,000
Impaired Financing Receivable, Recorded Investment | 18,243,000 |  | 18,243,000 |  | 14,206,000
Impaired Financing Receivable, Related Allowance | 2,052,000 |  | 2,052,000 |  | 99,000
Average Investment in Impaired Loans | 19,306,000 | 18,981,000 | 19,313,000 | 15,113,000 |
Interest Income Recognized | 121,000 | 178,000 | 380,000 | 547,000 |
Commercial Portfolio Segment [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 15,958,000 |  | 15,958,000 |  | 14,074,000
Recorded Investment With No Allowance | 5,864,000 |  | 5,864,000 |  | 3,949,000
Recorded Investment With Allowance | 8,112,000 |  | 8,112,000 |  | 7,573,000
Impaired Financing Receivable, Recorded Investment | 13,976,000 |  | 13,976,000 |  | 11,522,000
Impaired Financing Receivable, Related Allowance | 3,996,000 |  | 3,996,000 |  | 262,000
Average Investment in Impaired Loans | 16,105,000 | 6,006,000 | 14,588,000 | 4,259,000 |
Interest Income Recognized | 92,000 | 75,000 | 287,000 | 154,000 |
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 13,774,000 |  | 13,774,000 |  | 11,848,000
Recorded Investment With No Allowance | 4,805,000 |  | 4,805,000 |  | 2,734,000
Recorded Investment With Allowance | 8,112,000 |  | 8,112,000 |  | 7,573,000
Impaired Financing Receivable, Recorded Investment | 12,917,000 |  | 12,917,000 |  | 10,307,000
Impaired Financing Receivable, Related Allowance | 3,996,000 |  | 3,996,000 |  | 262,000
Average Investment in Impaired Loans | 14,543,000 | 4,402,000 | 12,943,000 | 3,256,000 |
Interest Income Recognized | 84,000 | 59,000 | 255,000 | 118,000 |
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |  |  |
Unpaid Contractual Principal Balance | 2,184,000 |  | 2,184,000 |  | 2,226,000
Recorded Investment With No Allowance | 1,059,000 |  | 1,059,000 |  | 1,215,000
Recorded Investment With Allowance |  |  |  |  |
Impaired Financing Receivable, Recorded Investment | 1,059,000 |  | 1,059,000 |  | 1,215,000
Impaired Financing Receivable, Related Allowance |  |  |  |  |
Average Investment in Impaired Loans | 1,562,000 | 1,604,000 | 1,645,000 | 1,003,000 |
Interest Income Recognized | $ 8,000 | $ 16,000 | $ 32,000 | $ 36,000 |

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