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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information [Line Items]                      
Goodwill and other intangibles $ 42,645       $ 43,952       $ 42,645 $ 43,952  
Total assets 2,449,158       2,328,864       2,449,158 2,328,864  
Net interest income 21,165 $ 20,757 $ 20,491 $ 19,965 20,074 $ 19,919 $ 19,562 $ 18,946 82,378 78,501 $ 73,646
Provision for loan losses 600 550 750 550 525 950 750 775 2,450 3,000 3,350
Service fees, security gains and other noninterest income                 28,602 25,499 24,051
Noninterest expense                 62,616 59,775 58,096
Amortization and depreciation expense                 2,839 2,942 3,090
INCOME BEFORE INCOME TAXES 11,861 11,225 10,031 9,958 10,271 9,267 9,660 9,085 43,075 38,283 33,161
Income tax 2,186 2,071 1,488 1,570 1,585 1,183 1,587 1,359 7,315 5,714 10,450
NET INCOME 9,675 $ 9,154 $ 8,543 $ 8,388 8,686 $ 8,084 $ 8,073 $ 7,726 35,760 32,569 22,711
Eliminations And Others                      
Segment Reporting Information [Line Items]                      
Goodwill and other intangibles (822)       (822)       (822) (822)  
Total assets 4,482       4,670       4,482 4,670  
Net interest income                 (79) (86) (81)
Provision for loan losses                 0 0 0
Service fees, security gains and other noninterest income                 (264) (330) (340)
Noninterest expense                 980 889 1,029
Amortization and depreciation expense                 49 0 0
INCOME BEFORE INCOME TAXES                 (1,372) (1,305) (1,450)
Income tax                 (459) (443) (872)
NET INCOME                 (913) (862) (578)
Trust Segment | Operating Segments                      
Segment Reporting Information [Line Items]                      
Goodwill and other intangibles 6,326       6,661       6,326 6,661  
Total assets 13,892       14,550       13,892 14,550  
Net interest income                 156 141 109
Provision for loan losses                 0 0 0
Service fees, security gains and other noninterest income                 9,097 8,942 8,405
Noninterest expense                 6,015 6,251 6,164
Amortization and depreciation expense                 365 448 532
INCOME BEFORE INCOME TAXES                 2,873 2,384 1,818
Income tax                 604 504 432
NET INCOME                 2,269 1,880 1,386
Bank Segment | Operating Segments                      
Segment Reporting Information [Line Items]                      
Goodwill and other intangibles 37,141       38,113       37,141 38,113  
Total assets $ 2,430,784       $ 2,309,644       2,430,784 2,309,644  
Net interest income                 82,301 78,446 73,618
Provision for loan losses                 2,450 3,000 3,350
Service fees, security gains and other noninterest income                 19,769 16,887 15,986
Noninterest expense                 55,621 52,635 50,903
Amortization and depreciation expense                 2,425 2,494 2,558
INCOME BEFORE INCOME TAXES                 41,574 37,204 32,793
Income tax                 7,170 5,653 10,890
NET INCOME                 $ 34,404 $ 31,551 $ 21,903