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Revenue Recognition Revenue (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended
| June 30, 2018 |  | June 30, 2017 |  | June 30, 2018 |  | June 30, 2017
| (Dollars in thousands)
Deposit account fees (inclusive of cash management fees) | $ | 4,551 |  |  | $ | 4,392 |  |  | $ | 8,982 |  |  | $ | 8,936 |
Interchange fees | 3,919 |  |  | 3,561 |  |  | 7,324 |  |  | 6,682 |
ATM fees | 736 |  |  | 759 |  |  | 1,390 |  |  | 1,446 |
Investment management - wealth management and advisory services | 6,083 |  |  | 5,488 |  |  | 11,665 |  |  | 10,625 |
Investment management - retail investments and insurance revenue | 739 |  |  | 507 |  |  | 1,299 |  |  | 984 |
Merchant processing income | 348 |  |  | 274 |  |  | 779 |  |  | 567 |
Other noninterest income | 1,060 |  |  | 1,259 |  |  | 2,034 |  |  | 2,081 |
Total noninterest income in-scope of ASC 606 | 17,436 |  |  | 16,240 |  |  | 33,473 |  |  | 31,321 |
Total noninterest income out-of-scope of ASC 606 | 4,451 |  |  | 5,158 |  |  | 8,277 |  |  | 8,989 |
Total noninterest income | 21,887 |  |  | 21,398 |  |  | 41,750 |  |  | 40,310 |
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, 2018 |  | December 31, 2017
| (Dollars in thousands)
Receivables, included in other assets | $ | 1,850 |  |  | $ | 1,934 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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- References No definition available. + Details
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