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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2020
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, 2020 and December 31, 2019 (in thousands):
| March 31, 2020 |  | December 31, 2019
| Gross Carrying Value |  | Accumulated Amortization |  | Gross Carrying Value |  | Accumulated Amortization
Goodwill not subject to amortization (effective 1/1/02) | $ | 108,752 |  |  | $ | 3,760 |  |  | $ | 108,752 |  |  | $ | 3,760 |
Intangibles from branch acquisition | 3,015 |  |  | 3,015 |  |  | 3,015 |  |  | 3,015 |
Core deposit intangibles | 32,355 |  |  | 18,589 |  |  | 32,355 |  |  | 17,746 |
Other intangibles | 16,389 |  |  | 4,244 |  |  | 16,129 |  |  | 3,917 |
| $ | 160,511 |  |  | $ | 29,608 |  |  | $ | 160,251 |  |  | $ | 28,438 |
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, 2020, March 31, 2019 and December 31, 2019 (in thousands):
| March 31, 2020 |  | March 31, 2019 |  | December 31, 2019
Beginning Balance | $ | 1,444 |  |  | $ | 2,101 |  |  | $ | 2,101 |
Mortgage servicing rights acquired during period | — |  |  | — |  |  | — |
Mortgage servicing rights capitalized | — |  |  | — |  |  | — |
Valuation reserve | (18 | ) |  | — |  |  | (380 | )
Mortgage servicing rights amortized | (126 | ) |  | (58 | ) |  | (411 | )
I/O Strip | (4 | ) |  | — |  |  | 134 |
Ending Balance | $ | 1,296 |  |  | $ | 2,043 |  |  | $ | 1,444 |
Schedule of Intangible Assets Amortization Expense [Table Text Block] | Total amortization expense for the three months ended March 31, 2020 and 2019 was as follows (in thousands):
| Three months ended March 31,
| 2020 |  | 2019
Core deposit intangibles | $ | 843 |  |  | $ | 980 |
Customer list intangibles | 326 |  |  | 318 |
Mortgage servicing rights | 126 |  |  | 58 |
| $ | 1,295 |  |  | $ | 1,356 |
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 01/01/20-3/31/20 | $ | 1,295 |
Estimated amortization expense: |
For period 4/01/20-12/31/20 | 3,674 |
For year ended 12/31/20 | 4,285 |
For year ended 12/31/21 | 3,919 |
For year ended 12/31/22 | 3,498 |
For year ended 12/31/23 | 2,946 |
For year ended 12/31/24 | 2,633 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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