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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items] |
Schedule of Intangible Assets and Goodwill [Table Text Block] | The following table presents gross carrying value and accumulated amortization by major intangible asset class as of March 31, 2018 and December 31, 2017 (in thousands):
| March 31, 2018 | December 31, 2017
| Gross Carrying Value | Accumulated Amortization | Gross Carrying Value | Accumulated Amortization
Goodwill not subject to amortization (effective 1/1/02) | $ | 63,910 |  | $ | 3,760 |  | $ | 63,910 |  | $ | 3,760 |
Intangibles from branch acquisition | 3,015 |  | 3,015 |  | 3,015 |  | 3,015 |
Core deposit intangibles | 19,862 |  | 11,893 |  | 19,862 |  | 11,473 |
Other intangibles | 3,731 |  | 2,331 |  | 3,731 |  | 2,285 |
| $ | 90,518 |  | $ | 20,999 |  | $ | 90,518 |  | $ | 20,533 |
Intangible Assets, Mortgage Servicing Rights [Table Text Block] | The following table summarizes the activity pertaining to mortgage servicing rights included in intangible assets as of March 31, 2018 and December 31, 2017 (in thousands):
| March 31, 2018 |  |  | December 31, 2017 |
Beginning Balance | $ | 844 |  |  | $ | 985 |
Mortgage servicing rights amortized | (39 | ) |  | (141 | )
Ending Balance | $ | 805 |  |  | $ | 844 |
Schedule of Intangible Assets Amortization Expense [Table Text Block] | Total amortization expense for the three months ended March 31, 2018 and 2017 was as follows (in thousands):
| Three months ended March 31,
| 2018 |  | 2017
Core deposit intangibles | $ | 420 |  |  | $ | 471 |
Other intangibles | 46 |  |  | 46 |
Mortgage servicing rights | 39 |  |  | 30 |
| $ | 505 |  |  | $ | 547 |
Schedule of Expected Amortization Expense [Table Text Block] | Aggregate amortization expense for the current year and estimated amortization expense for each of the five succeeding years is shown in the table below (in thousands):
Aggregate amortization expense: |
For period 01/01/18-03/31/18 | $ | 505 |
Estimated amortization expense: |
For period 04/01/18-12/31/18 | 1,449 |
For year ended 12/31/19 | 1,778 |
For year ended 12/31/20 | 1,576 |
For year ended 12/31/21 | 1,304 |
For year ended 12/31/22 | 1,195 |
For year ended 12/31/23 | 1,098 |
First Clover Leaf [Member] |
Finite-Lived Intangible Assets [Line Items] |
Reconciliation of purchase price to goodwill recorded [Table Text Block] |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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