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Industry Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fee revenue and other income: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  | $ 95,512 |  | $ 86,136 | $ 83,368
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) after provision for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  | 39,790 |  | 39,401 | 37,449
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 4,052 |  | 3,653 | 3,416
Income taxes | $ 3,576 | [1] | $ 2,396 | $ 2,248 | $ 1,665 | $ 1,806 | $ 1,855 | $ 2,035 | $ 2,020 | 9,885 | [1] | 7,716 | 7,978
Net income | 5,331 |  | $ 6,863 | $ 6,513 | $ 6,307 | 6,424 | $ 6,222 | $ 5,869 | $ 5,833 | 25,014 |  | 24,348 | 23,056
Goodwill | 12,569 |  |  |  |  | 11,590 |  |  |  | 12,569 |  | 11,590 | 11,590
Other intangible assets, net | 1,996 |  |  |  |  | 1,997 |  |  |  | 1,996 |  | 1,997 | 2,405
Total assets | 1,603,209 |  |  |  |  | 1,504,839 |  |  |  | 1,603,209 |  | 1,504,839 | 1,455,506
Information Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue and other income: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  | 93,804 |  | 84,612 | 82,144
Intersegment income (expense) |  |  |  |  |  |  |  |  |  | 13,317 |  | 12,164 | 10,078
Net interest income (expense) after provision for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  | 13,400 |  | 13,820 | 14,598
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |  | 2 | 12
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 3,784 |  | 3,368 | 3,164
Income taxes |  |  |  |  |  |  |  |  |  | 4,326 |  | 1,478 | 2,818
Net income |  |  |  |  |  |  |  |  |  | 13,597 |  | 14,049 | 14,635
Goodwill | 12,433 |  |  |  |  | 11,454 |  |  |  | 12,433 |  | 11,454 | 11,454
Other intangible assets, net | 1,996 |  |  |  |  | 1,997 |  |  |  | 1,996 |  | 1,997 | 2,405
Total assets | 800,214 |  |  |  |  | 763,999 |  |  |  | 800,214 |  | 763,999 | 702,491
Banking Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue and other income: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  | 1,708 |  | 1,524 | 1,224
Intersegment income (expense) |  |  |  |  |  |  |  |  |  | 1,545 |  | 1,575 | 1,648
Net interest income (expense) after provision for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  | 26,390 |  | 25,581 | 22,851
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |  | (2) | (12)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 150 |  | 165 | 151
Income taxes |  |  |  |  |  |  |  |  |  | 5,559 |  | 6,238 | 5,160
Net income |  |  |  |  |  |  |  |  |  | 11,417 |  | 10,299 | 8,421
Goodwill | 136 |  |  |  |  | 136 |  |  |  | 136 |  | 136 | 136
Other intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 830,672 |  |  |  |  | 756,164 |  |  |  | 830,672 |  | 756,164 | 761,739
Corporate Eliminations and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fee revenue and other income: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment income (expense) |  |  |  |  |  |  |  |  |  | (14,862) |  | (13,739) | (11,726)
Net interest income (expense) after provision for loan losses: |  |  |  |  |  |  |  |  |  |  |  |  |
Income from customers |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 118 |  | 120 | 101
Income taxes |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | $ (27,677) |  |  |  |  | $ (15,324) |  |  |  | $ (27,677) |  | $ (15,324) | $ (8,724)
[1] | Includes one-time, non-cash TCJA charge of $1,824,000

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