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Other Borrowings (Details) - Other Borrowings (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016
Note 11 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |  |
Weighted-average interest rate | 1.65% | 1.77% |
Other borrowings | $ 9,939 | $ 10,624 | $ 9,713
Fixed Rate Amortizing [Member] |  |  |
Note 11 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |  |
Maturity range, minimum | Jul. 01, 2017 |  |
Maturity range, maximum | Oct. 01, 2028 |  |
Weighted-average interest rate | 4.02% |  |
Other borrowings | $ 1,691 | 2,376 |
Junior Subordinated Debt [Member] |  |  |
Note 11 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |  |
Maturity range, minimum | Dec. 21, 2037 |  |
Maturity range, maximum | Dec. 21, 2037 |  |
Weighted-average interest rate | 1.95% |  |
Other borrowings | $ 8,248 | $ 8,248 |
Minimum [Member] | Fixed Rate Amortizing [Member] |  |  |
Note 11 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |  |
Stated interest rate range | 2.99% |  |
Minimum [Member] | Junior Subordinated Debt [Member] |  |  |
Note 11 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |  |
Stated interest rate range | 1.90% |  |
Maximum [Member] | Fixed Rate Amortizing [Member] |  |  |
Note 11 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |  |
Stated interest rate range | 4.47% |  |
Maximum [Member] | Junior Subordinated Debt [Member] |  |  |
Note 11 - Other Borrowings (Details) - Other Borrowings [Line Items] |  |  |
Stated interest rate range | 1.99% |  |

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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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