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Industry Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee income from customers |  |  |  |  |  |  |  |  |  |  | $ 104,076 |  | $ 95,512 |  | $ 86,136 |
Interest income | [1] |  |  |  |  |  |  |  |  |  | 50,348 |  | 47,667 |  | 45,431 |
Interest expense |  | $ 1,234 | $ 1,029 | $ 794 | $ 679 | $ 666 |  | $ 571 | $ 470 | $ 480 | 3,736 |  | 2,187 |  | 2,029 |
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 4,396 |  | 4,051 |  | 3,653 |
Tax-equivalized pre-tax income |  | 1,502 | $ 1,481 | $ 1,387 | $ 1,709 | 3,576 | [2] | $ 2,396 | $ 2,248 | $ 1,665 | 6,079 | [1] | 9,885 | [1],[2] | 7,716 | [1]
Goodwill |  | 12,569 |  |  |  | 12,569 |  |  |  |  | 12,569 |  | 12,569 |  | 11,590 |
Other intangible assets, net |  | 1,554 |  |  |  | 1,996 |  |  |  |  | 1,554 |  | 1,996 |  | 1,997 |
Total Assets |  | 1,695,176 |  |  |  | 1,657,209 |  |  |  |  | 1,695,176 |  | 1,657,209 |  | 1,504,839 |
Funding Sources |  | 1,215,386 |  |  |  | 1,203,479 |  |  |  |  | 1,215,386 |  | 1,203,479 |  | 1,160,700 |
Information Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee income from customers |  |  |  |  |  |  |  |  |  |  | 102,839 |  | 93,484 |  | 83,821 |
Interest income | [1] |  |  |  |  |  |  |  |  |  | 22,273 |  | 20,634 |  | 18,729 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 4,254 |  | 3,902 |  | 3,488 |
Tax-equivalized pre-tax income | [1] |  |  |  |  |  |  |  |  |  | 24,962 |  | 24,990 |  | 20,065 |
Goodwill |  | 12,433 |  |  |  | 12,433 |  |  |  |  | 12,433 |  | 12,433 |  | 11,454 |
Other intangible assets, net |  | 1,554 |  |  |  | 1,996 |  |  |  |  | 1,554 |  | 1,996 |  | 1,997 |
Total Assets |  | 826,201 |  |  |  | 854,214 |  |  |  |  | 826,201 |  | 854,214 |  | 763,999 |
Funding Sources |  | 642,733 |  |  |  | 604,493 |  |  |  |  | 642,733 |  | 604,493 |  | 545,726 |
Banking Services [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee income from customers |  |  |  |  |  |  |  |  |  |  | 1,307 |  | 1,547 |  | 1,417 |
Interest income | [1] |  |  |  |  |  |  |  |  |  | 23,706 |  | 23,732 |  | 24,088 |
Interest expense |  |  |  |  |  |  |  |  |  |  | 3,736 |  | 2,187 |  | 2,029 |
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  | 1,880 |  | 1,362 |  | 1,136 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 142 |  | 149 |  | 165 |
Tax-equivalized pre-tax income | [1] |  |  |  |  |  |  |  |  |  | 11,625 |  | 13,691 |  | 15,090 |
Goodwill |  | 136 |  |  |  | 136 |  |  |  |  | 136 |  | 136 |  | 136 |
Other intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 886,291 |  |  |  | 830,672 |  |  |  |  | 886,291 |  | 830,672 |  | 756,164 |
Funding Sources |  | 572,653 |  |  |  | 598,986 |  |  |  |  | 572,653 |  | 598,986 |  | 614,974 |
Corporate Eliminations and Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee income from customers |  |  |  |  |  |  |  |  |  |  | (70) |  | 481 |  | 898 |
Interest income | [1] |  |  |  |  |  |  |  |  |  | 4,369 |  | 3,301 |  | 2,614 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment income (expense) |  |  |  |  |  |  |  |  |  |  | (1,880) |  | (1,362) |  | (1,136) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-equivalized pre-tax income | [1] |  |  |  |  |  |  |  |  |  | 2,181 |  | 1,908 |  | 2,410 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other intangible assets, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | (17,316) |  |  |  | (27,677) |  |  |  |  | (17,316) |  | (27,677) |  | (15,324) |
Funding Sources |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.
[2] | Includes one-time, non-cash TCJA charge of $1,824,000

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