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Consolidated Statements of Comprehensive Income - 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
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 4,723	$ 4,275	$ 6,180	$ 3,224	$ 3,193	$ 3,875	$ 4,114	$ 3,767	$ 18,402	$ 14,949	$ 12,720
Other Comprehensive Income (Loss) (Net of Tax):
Net unrealized gain (loss) on available-for-sale securities									5,179	(1,058)	267
Reclassification adjustment for (gain) loss on sale of available-for-sale securities									26	9	(47)
Net unrealized gain (loss) on available-for-sale securities									5,205	(1,049)	220
Tax expense (benefit)									1,093	(220)	74
Other comprehensive income (loss)									4,112	(829)	146
Comprehensive Income									$ 22,514	$ 14,120	$ 12,866

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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