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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2018
Partners' Capital, Comprehensive Income [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | The following table presents the changes in each component of accumulated other comprehensive loss, net of tax, for the three and nine months ended September 30, 2018 and 2017 (in thousands):
|  |  | Three months ended September 30, 2018 |  |  | Three months ended September 30, 2017
|  |  | Net Unrealized Gains and (Losses) on Investment Securities AFS (1) |  |  | Defined Benefit Pension Items (1) |  |  | Total (1) |  |  | Net Unrealized Gains and (Losses) on Investment Securities AFS (1) |  |  | Defined Benefit Pension Items (1) |  |  | Total (1)
Beginning balance |  |  | $ | (2,177 | ) |  |  | $ | (11,490 | ) |  |  | $ | (13,667 | ) |  |  | $ | 30 |  |  |  | $ | (11,094 | ) |  |  | $ | (11,064 | )
Other comprehensive income (loss) before reclassifications |  |  |  | (726 | ) |  |  |  | (79 | ) |  |  |  | (805 | ) |  |  |  | 116 |  |  |  |  | 261 |  |  |  |  | 377 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | — |  |  |  |  | 387 |  |  |  |  | 387 |  |  |  |  | (37 | ) |  |  |  | — |  |  |  |  | (37 | )
Net current period other comprehensive income (loss) |  |  |  | (726 | ) |  |  |  | 308 |  |  |  |  | (418 | ) |  |  |  | 79 |  |  |  |  | 261 |  |  |  |  | 340 |
Ending balance |  |  | $ | (2,903 | ) |  |  | $ | (11,182 | ) |  |  | $ | (14,085 | ) |  |  | $ | 109 |  |  |  | $ | (10,833 | ) |  |  | $ | (10,724 | )
| (1) | Amounts in parentheses indicate debits on the Consolidated Balance Sheets.
|  |  | Nine months ended September 30, 2018 |  |  | Nine months ended September 30, 2017
|  |  | Net Unrealized Gains and (Losses) on Investment Securities AFS (1) |  |  | Defined Benefit Pension Items (1) |  |  | Total (1) |  |  | Net Unrealized Gains and (Losses) on Investment Securities AFS (1) |  |  | Defined Benefit Pension Items (1) |  |  | Total (1)
Beginning balance |  |  | $ | (327 | ) |  |  | $ | (12,623 | ) |  |  | $ | (12,950 | ) |  |  | $ | (171 | ) |  |  | $ | (11,406 | ) |  |  | $ | (11,577 | )
Other comprehensive income (loss) before reclassifications |  |  |  | (2,693 | ) |  |  |  | 280 |  |  |  |  | (2,413 | ) |  |  |  | 356 |  |  |  |  | 783 |  |  |  |  | 1,139 |
Amounts reclassified from accumulated other comprehensive loss |  |  |  | 117 |  |  |  |  | 1,161 |  |  |  |  | 1,278 |  |  |  |  | (76 | ) |  |  |  | (210 | ) |  |  |  | (286 | )
Net current period other comprehensive income (loss) |  |  |  | (2,576 | ) |  |  |  | 1,441 |  |  |  |  | (1,135 | ) |  |  |  | 280 |  |  |  |  | 573 |  |  |  |  | 853 |
Ending balance |  |  | $ | (2,903 | ) |  |  | $ | (11,182 | ) |  |  | $ | (14,085 | ) |  |  | $ | 109 |  |  |  | $ | (10,833 | ) |  |  | $ | (10,724 | )
| (1) | Amounts in parentheses indicate debits on the Consolidated Balance Sheets.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The following table presents the amounts reclassified out of each component of accumulated other comprehensive loss for the three and nine months ended September 30, 2018 and 2017 (in thousands):
|  |  | Amount reclassified from accumulated other comprehensive loss (1) |  |
Details about accumulated other comprehensive loss components |  |  | For the three months ended September 30, 2018 |  |  | For the three months ended September 30, 2017 |  | Affected line item in the consolidated statement of operations
Realized gains on sale of securities |  |  | $ | — |  |  |  | $ | (56 | ) |  | Net realized gains on investment securities |
|  |  |  | — |  |  |  |  | 19 |  |  | Provision for income tax expense |
|  |  | $ | — |  |  |  | $ | (37 | ) |  | Net of tax |
Amortization of estimated defined benefit pension plan loss |  |  | $ | 490 |  |  |  | $ | — |  |  | Other expense |
|  |  |  | (103 | ) |  |  |  | — |  |  | Provision for income taxes |
|  |  | $ | 387 |  |  |  | $ | — |  |  | Net of tax |
Total reclassifications for the period |  |  | $ | 387 |  |  |  | $ | (37 | ) |  | Net income |
| (1) | Amounts in parentheses indicate credits.
|  |  | Amount reclassified from accumulated other comprehensive loss(1) |  |
Details about accumulated other comprehensive loss components |  |  | For the nine months ended September 30, 2018 |  |  | For the nine months ended September 30, 2017 |  | Affected line item in the consolidated statement of operations
Realized (gains) losses on sale of securities |  |  | $ | 148 |  |  |  | $ | (115 | ) |  | Net realized (gains) losses on investment securities |
|  |  |  | (31 | ) |  |  |  | 39 |  |  | Provision for income tax expense |
|  |  | $ | 117 |  |  |  | $ | (76 | ) |  | Net of tax |
Amortization of estimated defined benefit pension plan loss |  |  | $ | 1,470 |  |  |  | $ | (318 | ) |  | Other expense |
|  |  |  | (309 | ) |  |  |  | 108 |  |  | Provision for income taxes |
|  |  | $ | 1,161 |  |  |  | $ | (210 | ) |  | Net of tax |
Total reclassifications for the period |  |  | $ | 1,278 |  |  |  | $ | (286 | ) |  | Net income |
| (1) | Amounts in parentheses indicate income and other amounts indicate expenses.

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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