Parent Company Financial Statements (Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Dividend income from subsidiary									$ 655	$ 722	$ 1,315
Income before income tax expense	$ 22,842	$ 20,969	$ 13,692	$ 16,893	$ 19,159	$ 18,184	$ 16,479	$ 17,757	74,396	71,579	65,777
Income tax benefit	(4,564)	(4,194)	(2,752)	(3,400)	(3,921)	(3,696)	(3,275)	(3,484)	(14,910)	(14,376)	(12,706)
Net income	$ 18,278	$ 16,775	$ 10,940	$ 13,493	$ 15,238	$ 14,488	$ 13,204	$ 14,273	59,486	57,203	53,071
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Dividend income from subsidiary									39,400	36,900	28,100
Other income									103	1,128	283
Total operating income									39,503	38,028	28,383
Interest on borrowings									3,512	3,267	3,415
Fees to Bank									160	160	160
Other operating expenses									578	641	569
Total operating expenses									4,250	4,068	4,144
Income before equity in undistributed income of subsidiaries and income taxes									35,253	33,960	24,239
Equity in undistributed income of subsidiaries									23,299	22,580	27,971
Income before income tax expense									58,552	56,540	52,210
Income tax benefit									934	663	861
Net income									$ 59,486	$ 57,203	$ 53,071