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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract] |
Revenue Recognition, Transition Adjustment [Table Text Block] | The impact on the condensed consolidated statements of income of adopting ASC 606 as of December 31 is outlined below:
| 2018
| As Reported |  | Under Legacy GAAP |  | Impact of ASC 606
| (dollars in thousands)
Noninterest Income |  |  |  |  |
Net securities gains | $ | 8,102 |  |  | $ | 8,102 |  |  | $ | — |
Trust income | 7,901 |  |  | 7,901 |  |  | — |
Service charges on deposit accounts | 18,175 |  |  | 18,175 |  |  | — |
Insurance and retail brokerage commissions | 7,426 |  |  | 9,893 |  |  | (2,467 | )
Income from bank owned life insurance | 6,686 |  |  | 6,686 |  |  | — |
Gain on sale of mortgage loans | 5,436 |  |  | 5,436 |  |  | — |
Gain on sale of other loans and assets | 5,273 |  |  | 5,273 |  |  | — |
Card-related interchange income | 20,187 |  |  | 20,187 |  |  | — |
Derivatives mark to market | 787 |  |  | 787 |  |  | — |
Swap fee income | 1,874 |  |  | 1,874 |  |  | — |
Other income | 6,790 |  |  | 7,693 |  |  | (903 | )
Total noninterest income | 88,637 |  |  | 92,007 |  |  | (3,370 | )
Noninterest Expense |  |  |  |  |
Salaries and employee benefits | 105,115 |  |  | 107,582 |  |  | (2,467 | )
Net occupancy expense | 17,219 |  |  | 17,219 |  |  | — |
Furniture and equipment expense | 14,247 |  |  | 14,247 |  |  | — |
Data processing expense | 10,470 |  |  | 10,849 |  |  | (379 | )
Advertising and promotion expense | 3,956 |  |  | 3,956 |  |  | — |
Pennsylvania shares tax expense | 4,875 |  |  | 4,875 |  |  | — |
Intangible amortization | 3,217 |  |  | 3,217 |  |  | — |
Collection and repossession expense | 2,762 |  |  | 2,762 |  |  | — |
Other professional fees and services | 4,473 |  |  | 4,473 |  |  | — |
FDIC insurance | 2,007 |  |  | 2,007 |  |  | — |
Loss on sale or write-down of assets | 1,080 |  |  | 1,080 |  |  | — |
Litigation and operational losses | 1,162 |  |  | 1,162 |  |  | — |
Merger and acquisition related | 1,637 |  |  | 1,637 |  |  | — |
Other operating expenses | 23,336 |  |  | 23,860 |  |  | (524 | )
Total noninterest expense | $ | 195,556 |  |  | $ | 198,926 |  |  | (3,370 | )
Net Impact |  |  |  |  | $ | — |
Disaggregation of Revenue [Table Text Block] | The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606 for the year ended December 31:
| 2018 |  | 2017 |  | 2016
| (dollars in thousands)
Noninterest Income |  |  |  |  |
In-scope of Topic 606: |  |  |  |  |
Trust income | $ | 7,901 |  |  | $ | 7,098 |  |  | $ | 5,366 |
Service charges on deposit accounts | 18,175 |  |  | 18,579 |  |  | 15,869 |
Insurance and retail brokerage commissions | 7,426 |  |  | 8,807 |  |  | 7,964 |
Card-related interchange income | 20,187 |  |  | 18,780 |  |  | 14,955 |
Gain on sale of other loans and assets | 982 |  |  | 1,005 |  |  | 1,389 |
Other income | 3,708 |  |  | 4,328 |  |  | 3,638 |
Noninterest Income (in-scope of Topic 606) | 58,379 |  |  | 58,597 |  |  | 49,181 |
Noninterest Income (out-of-scope of Topic 606) | 30,258 |  |  | 21,734 |  |  | 15,418 |
Total Noninterest Income | $ | 88,637 |  |  | $ | 80,331 |  |  | $ | 64,599 |

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- Definition Revenue Recognition, Transition Adjustment [Table Text Block] + References No definition available. + 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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