Equity Incentive Plan - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Options
Options Outstanding, Beginning of Period (in shares)	1,615,500	1,657,214	1,657,214
Granted (in shares)		25,000
Exercised (in shares)		13,400
Forfeited (in shares)	200	800
Options Outstanding, End of period (in shares)	1,615,300	1,668,014	1,615,500	1,657,214
Exercisable (in shares)	1,303,000	1,266,214
Weighted- average exercise price
Options Outstanding, Beginning of Period (in usd per share)	$ 18.12	$ 17.59	$ 17.59
Granted (in usd per share)		25.37
Exercised (in usd per share)		14.50
Forfeited (in usd per share)	24.95	17.35
Options Outstanding, End of Period (in usd per share)	18.12	17.73	$ 18.12	$ 17.59
Exercisable (in usd per share)	$ 16.31	$ 15.40
Remaining contractual life (years)	4 years 1 month 6 days	4 years 10 months 24 days	4 years 4 months 24 days	5 years
Exercisable (in years)	3 years 3 months 18 days	3 years 9 months 18 days
Aggregate intrinsic value	$ 0	$ 13,969	$ 1,711	$ 12,909
Aggregate intrinsic value	$ 0	$ 13,509
Non-vested Options
Nonvested, number of shares (in shares)	312,300	401,800
Nonvested, weighted average grant date fair value (in dollars per share)	$ 25.68	$ 25.07
Nonvested, contractual term (in years)	7 years 7 months 6 days	8 years 1 month 6 days
Nonvested, intrinsic value	$ 0	$ 460