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Revenue Recognition Revenue (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended
| June 30, 2019 |  | June 30, 2018 |  | June 30, 2019 |  | June 30, 2018
| (Dollars in thousands)
Deposit account fees (inclusive of cash management fees) | $ | 5,080 |  |  | $ | 4,551 |  |  | $ | 9,486 |  |  | $ | 8,982 |
Interchange fees | 4,825 |  |  | 3,919 |  |  | 8,560 |  |  | 7,324 |
ATM fees | 856 |  |  | 736 |  |  | 1,522 |  |  | 1,390 |
Investment management - wealth management and advisory services | 6,423 |  |  | 6,083 |  |  | 12,492 |  |  | 11,665 |
Investment management - retail investments and insurance revenue | 730 |  |  | 739 |  |  | 1,409 |  |  | 1,299 |
Merchant processing income | 324 |  |  | 348 |  |  | 604 |  |  | 779 |
Other noninterest income | 1,642 |  |  | 1,060 |  |  | 2,581 |  |  | 2,034 |
Total noninterest income in-scope of ASC 606 | 19,880 |  |  | 17,436 |  |  | 36,654 |  |  | 33,473 |
Total noninterest income out-of-scope of ASC 606 | 8,768 |  |  | 4,451 |  |  | 13,527 |  |  | 8,277 |
Total noninterest income | 28,648 |  |  | 21,887 |  |  | 50,181 |  |  | 41,750 |
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:
| June 30, 2019 |  | December 31, 2018
| (Dollars in thousands)
Receivables, included in other assets | $ | 1,964 |  |  | $ | 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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