Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020
Release/lapse of restriction on RSUs (in shares)	9,542	22,946	8,260	24,550
Repurchase of common stock (in shares)		95,340	56,985	49,216
Dividends paid on common stock (in dollars per share)	$ 0.2200	$ 0.22	$ 0.2025	$ 0.2025	$ 0.4400
Accounting standards update					us-gaap:AccountingStandardsUpdate201613Member
Additional Paid-in Capital
Expenses incurred in stock issuance			$ 323
Common Stock
Issuance of common stock due to business combination (in shares)			4,117,536
ATBancorp
Deferred income taxes					$ 296
Goodwill adjustments					$ 2,060