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Revenue Recognition Revenue (Tables) | 9 Months Ended
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Sep. 30, 2019
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 2019 |  | September 30 2018 |  | September 30 2019 |  | September 30 2018
| (Dollars in thousands)
Deposit account fees (inclusive of cash management fees) | $ | 5,299 |  |  | $ | 4,658 |  |  | $ | 14,785 |  |  | $ | 13,640 |
Interchange fees | 4,913 |  |  | 3,943 |  |  | 13,473 |  |  | 11,267 |
ATM fees | 939 |  |  | 825 |  |  | 2,461 |  |  | 2,215 |
Investment management - wealth management and advisory services | 6,635 |  |  | 5,912 |  |  | 19,127 |  |  | 17,577 |
Investment management - retail investments and insurance revenue | 553 |  |  | 652 |  |  | 1,962 |  |  | 1,951 |
Merchant processing income | 230 |  |  | 227 |  |  | 834 |  |  | 1,006 |
Other noninterest income | 1,487 |  |  | 1,152 |  |  | 4,068 |  |  | 3,186 |
Total noninterest income in-scope of ASC 606 | 20,056 |  |  | 17,369 |  |  | 56,710 |  |  | 50,842 |
Total noninterest income out-of-scope of ASC 606 | 11,760 |  |  | 5,895 |  |  | 25,287 |  |  | 14,172 |
Total noninterest income | $ | 31,816 |  |  | $ | 23,264 |  |  | $ | 81,997 |  |  | $ | 65,014 |
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, 2019 |  | December 31, 2018
| (Dollars in thousands)
Receivables, included in other assets | $ | 2,124 |  |  | $ | 1,893 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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- References No definition available. + Details
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