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 Comprehensive Income [Abstract]
Net income	$ 7,096	$ 6,326	$ 6,121	$ 5,696	$ 3,576	$ 6,288	$ 6,008	$ 6,028	$ 25,239	$ 21,900	$ 15,226
Other comprehensive income (loss)
Net unrealized holding gains (losses) on securities available-for-sale recorded within other comprehensive income before income tax									12,072	(10,466)	6,280
Reclassification adjustment for losses realized									458	0	8
Net unrealized holding losses on cash flow hedging derivatives recorded within other comprehensive income before income tax									(9,071)	(4,358)	0
Other comprehensive income (loss) before tax									3,459	(14,824)	6,288
Income tax provision (benefit)									1,109	(4,365)	2,039
Other comprehensive income (loss) - net of tax									2,350	(10,459)	4,249
Comprehensive income									$ 27,589	$ 11,441	$ 19,475