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Revenue Recognition Revenue (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue [Table Text Block] | The following table presents the revenue streams that the Company has disaggregated as of the periods indicated:
| Three Months Ended |  | Nine Months Ended
| September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
| (Dollars in thousands)
Deposit account fees (inclusive of cash management fees) | $ | 4,658 |  |  | $ | 4,401 |  |  | $ | 13,640 |  |  | $ | 13,337 |
Interchange fees | 3,943 |  |  | 3,597 |  |  | 11,267 |  |  | 10,279 |
ATM fees | 825 |  |  | 815 |  |  | 2,215 |  |  | 2,261 |
Investment management - wealth management and advisory services | 5,912 |  |  | 5,402 |  |  | 17,577 |  |  | 16,027 |
Investment management - retail investments and insurance revenue | 652 |  |  | 565 |  |  | 1,951 |  |  | 1,549 |
Merchant processing income | 227 |  |  | 337 |  |  | 1,006 |  |  | 904 |
Other noninterest income | 1,152 |  |  | 1,188 |  |  | 3,186 |  |  | 3,269 |
Total noninterest income in-scope of ASC 606 | 17,369 |  |  | 16,305 |  |  | 50,842 |  |  | 47,626 |
Total noninterest income out-of-scope of ASC 606 | 5,895 |  |  | 4,465 |  |  | 14,172 |  |  | 13,454 |
Total noninterest income | 23,264 |  |  | 20,770 |  |  | 65,014 |  |  | 61,080 |
Contract with Customer, Asset and Liability [Table Text Block] | The following table provides the amount of investment management revenue earned but not received as of the periods indicated:
| September 30, 2018 |  | December 31, 2017
| (Dollars in thousands)
Receivables, included in other assets | $ | 1,892 |  |  | $ | 1,934 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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