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Parent Company Only Financial Statements Condensed statements of income (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
Condensed Financial Statements, Captions [Line Items]                      
Income before income taxes $ 15,519 $ 15,490 $ 14,623 $ 17,634 $ 13,145 $ 10,965 $ 13,142 $ 11,253 $ 63,266 $ 48,505 $ 41,726
Income tax benefit (3,543) (3,820) (3,642) (4,318) (3,206) (2,731) (3,105) (2,863) (15,323) (11,905) (15,042)
Net income $ 11,976 $ 11,670 $ 10,981 $ 13,316 $ 9,939 $ 8,234 $ 10,037 $ 8,390 47,943 36,600 26,684
Other Comprehensive Income (Loss), Net of Tax                 14,833 (4,169) 3,525
Comprehensive income                 62,776 32,431 30,209
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Dividends from subsidiaries                 38,688 21,694 18,925
Other income                 12 171 1,227
Total income                 38,700 21,865 20,152
Operating expenses                 4,492 5,424 3,902
Income before income taxes                 34,208 16,441 16,250
Income tax benefit                 1,256 1,274 864
Income before equity in undistributed earnings of subsidiaries                 35,464 17,715 17,114
Equity in undistributed earnings of subsidiaries                 12,479 18,885 9,570
Net income                 47,943 36,600 26,684
Other Comprehensive Income (Loss), Net of Tax                 14,833 (4,169) 3,525
Comprehensive income                 $ 62,776 $ 32,431 $ 30,209