Stockholders' Equity - Summary of Company's Regulatory Capital Levels (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Stockholders Equity Note [Abstract]
Total capital (to risk-weighted assets), Actual, Amount	$ 778,253	$ 872,823
Tier 1 capital (to risk-weighted assets), Actual, Amount	748,315	837,677
Core (Tier 1) capital (to adjusted total assets), Actual, Amount	748,315	837,677
Tangible capital (to adjusted total assets), Actual, Amount	$ 748,315	$ 837,677
Total capital (to risk-weighted assets), Actual, Ratio	15.17%	19.65%
Tier 1 capital (to risk-weighted assets), Actual, Ratio	14.58%	18.86%
Core (Tier 1) capital (to adjusted total assets), Actual, Ratio	14.58%	18.86%
Tangible capital (to adjusted total assets), Actual, Ratio	10.14%	11.76%
Total capital (to risk-weighted assets), For Capital Adequacy Purposes, Amount	$ 410,515	$ 355,274
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purposes, Amount	307,886	266,456
Core (Tier 1) capital (to adjusted total assets), For Capital Adequacy Purposes, Amount	230,914	199,842
Tangible capital (to adjusted total assets), For Capital Adequacy Purposes, Amount	$ 295,290	$ 284,877
Total capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purposes, Ratio	6.00%	6.00%
Core (Tier 1) capital (to adjusted total assets), For Capital Adequacy Purposes, Ratio	4.50%	4.50%
Tangible capital (to adjusted total assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%