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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]                      
Goodwill and other intangibles $ 43,952       $ 45,369       $ 43,952 $ 45,369  
Total assets 2,328,864       2,159,069       2,328,864 2,159,069  
Net interest income 20,074 $ 19,919 $ 19,562 $ 18,946 19,067 $ 18,675 $ 18,373 $ 17,531 78,501 73,646 $ 68,120
Provision for loan losses 525 950 750 775 400 950 950 1,050 3,000 3,350 3,870
Service fees, security gains and other noninterest income                 25,499 24,051 23,244
Noninterest expense                 59,775 58,096 56,321
Amortization and depreciation expense                 2,942 3,090 3,131
INCOME BEFORE INCOME TAXES 10,271 9,267 9,660 9,085 9,414 8,088 7,809 7,850 38,283 33,161 28,042
Income tax 1,585 1,183 1,587 1,359 4,179 2,105 2,099 2,067 5,714 10,450 7,485
NET INCOME 8,686 $ 8,084 $ 8,073 $ 7,726 5,235 $ 5,983 $ 5,710 $ 5,783 32,569 22,711 20,557
Eliminations And Others                      
Segment Reporting Information [Line Items]                      
Goodwill and other intangibles (822)       (822)       (822) (822)  
Total assets 4,670       3,935       4,670 3,935  
Net interest income                 (86) (81) (88)
Provision for loan losses                 0 0 0
Service fees, security gains and other noninterest income                 (330) (340) (278)
Noninterest expense                 889 1,029 1,319
Amortization and depreciation expense                 0 0 0
INCOME BEFORE INCOME TAXES                 (1,305) (1,450) (1,685)
Income tax                 (443) (872) (670)
NET INCOME                 (862) (578) (1,015)
Trust Segment | Operating Segments                      
Segment Reporting Information [Line Items]                      
Goodwill and other intangibles 4,199       4,426       4,199 4,426  
Total assets 11,490       11,261       11,490 11,261  
Net interest income                 141 109 95
Provision for loan losses                 0 0 0
Service fees, security gains and other noninterest income                 7,258 6,548 6,341
Noninterest expense                 4,863 4,801 4,818
Amortization and depreciation expense                 249 277 305
INCOME BEFORE INCOME TAXES                 2,287 1,579 1,313
Income tax                 483 455 462
NET INCOME                 1,804 1,124 851
Bank Segment | Operating Segments                      
Segment Reporting Information [Line Items]                      
Goodwill and other intangibles 38,113       39,120       38,113 39,120  
Total assets 2,309,644       2,140,508       2,309,644 2,140,508  
Net interest income                 78,446 73,618 68,113
Provision for loan losses                 3,000 3,350 3,870
Service fees, security gains and other noninterest income                 16,887 15,986 15,191
Noninterest expense                 52,635 50,903 48,804
Amortization and depreciation expense                 2,494 2,558 2,519
INCOME BEFORE INCOME TAXES                 37,204 32,793 28,111
Income tax                 5,653 10,890 7,586
NET INCOME                 31,551 21,903 20,525
Retirement Consulting Segment | Operating Segments                      
Segment Reporting Information [Line Items]                      
Goodwill and other intangibles 2,462       2,645       2,462 2,645  
Total assets $ 3,060       $ 3,365       3,060 3,365  
Net interest income                 0 0 0
Provision for loan losses                 0 0 0
Service fees, security gains and other noninterest income                 1,684 1,857 1,990
Noninterest expense                 1,388 1,363 1,380
Amortization and depreciation expense                 199 255 307
INCOME BEFORE INCOME TAXES                 97 239 303
Income tax                 21 (23) 107
NET INCOME                 $ 76 $ 262 $ 196