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Income Taxes - Effective Income Tax Reconciliation (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
Income Tax Disclosure [Abstract]
Expected income taxes									$ 12,546	$ 13,286	$ 10,186
Tax-exempt income from bank owned life insurance									(363)	(563)	(283)
Other tax-exempt income									(1,758)	(1,701)	(1,598)
Nondeductible interest expense									45	70	43
State taxes, net of federal taxes									4,325	4,280	3,354
Other items									(158)	116	218
Adjustment of deferred tax assets and liabilities for enacted change in tax laws									0	0	0
Effect of marginal tax rate									(165)	(165)	(15)
Total	$ 4,484	$ 3,720	$ 3,096	$ 3,172	$ 3,543	$ 3,820	$ 3,642	$ 4,318	$ 14,472	$ 15,323	$ 11,905

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