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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill and other intangibles | $ 45,755 |  | $ 45,755 |  | $ 45,154
Total assets | 2,162,025 |  | 2,162,025 |  | 1,966,113
Net interest income | 18,675 | $ 17,193 | 54,579 | $ 50,829 |
Provision for loan losses | 950 | 1,110 | 2,950 | 2,880 | 0
Service fees, security gains and other noninterest income | 6,058 | 6,485 | 18,000 | 17,168 |
Noninterest expense | 14,926 | 14,377 | 43,536 | 42,093 |
Amortization and depreciation expense | 865 | 848 | 2,632 | 2,359 |
INCOME BEFORE INCOME TAXES | 7,992 | 7,343 | 23,461 | 20,665 |
Income taxes | 2,009 | 1,967 | 5,985 | 5,471 |
NET INCOME | 5,983 | 5,376 | 17,476 | 15,194 |
Eliminations And Others |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill and other intangibles | (822) |  | (822) |  | (646)
Total assets | 2,934 |  | 2,934 |  | 2,805
Net interest income | (21) | (21) | (64) | (69) |
Provision for loan losses | 0 | 0 | 0 | 0 |
Service fees, security gains and other noninterest income | (34) | (70) | (182) | (229) |
Noninterest expense | 319 | 267 | 531 | 1,256 |
Amortization and depreciation expense | 13 | 16 | 37 | 17 |
INCOME BEFORE INCOME TAXES | (387) | (374) | (814) | (1,571) |
Income taxes | (203) | (169) | (527) | (529) |
NET INCOME | (184) | (205) | (287) | (1,042) |
Trust Segment | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill and other intangibles | 4,490 |  | 4,490 |  | 4,681
Total assets | 11,031 |  | 11,031 |  | 10,980
Net interest income | 29 | 27 | 81 | 69 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Service fees, security gains and other noninterest income | 1,638 | 1,718 | 4,895 | 4,831 |
Noninterest expense | 1,154 | 1,152 | 3,619 | 3,465 |
Amortization and depreciation expense | 69 | 76 | 208 | 228 |
INCOME BEFORE INCOME TAXES | 444 | 517 | 1,149 | 1,207 |
Income taxes | 156 | 188 | 402 | 423 |
NET INCOME | 288 | 329 | 747 | 784 |
Bank Segment | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill and other intangibles | 39,382 |  | 39,382 |  | 38,235
Total assets | 2,144,827 |  | 2,144,827 |  | 1,948,800
Net interest income | 18,667 | 17,187 | 54,562 | 50,829 |
Provision for loan losses | 950 | 1,110 | 2,950 | 2,880 |
Service fees, security gains and other noninterest income | 3,974 | 4,276 | 11,895 | 11,020 |
Noninterest expense | 13,110 | 12,622 | 38,304 | 36,312 |
Amortization and depreciation expense | 718 | 666 | 2,196 | 1,845 |
INCOME BEFORE INCOME TAXES | 7,863 | 7,065 | 23,007 | 20,812 |
Income taxes | 2,031 | 1,900 | 6,068 | 5,501 |
NET INCOME | 5,832 | 5,165 | 16,939 | 15,311 |
Retirement Consulting Segment | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill and other intangibles | 2,705 |  | 2,705 |  | 2,884
Total assets | 3,233 |  | 3,233 |  | $ 3,528
Net interest income | 0 | 0 | 0 | 0 |
Provision for loan losses | 0 | 0 | 0 | 0 |
Service fees, security gains and other noninterest income | 480 | 561 | 1,392 | 1,546 |
Noninterest expense | 343 | 336 | 1,082 | 1,060 |
Amortization and depreciation expense | 65 | 90 | 191 | 269 |
INCOME BEFORE INCOME TAXES | 72 | 135 | 119 | 217 |
Income taxes | 25 | 48 | 42 | 76 |
NET INCOME | $ 47 | $ 87 | $ 77 | $ 141 |

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