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Stockholders' Equity - Summary of Company's Regulatory Capital Levels (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
Stockholders Equity Note [Abstract]    
Total capital (to risk-weighted assets), Actual, Amount $ 872,823 $ 906,058
Tier 1 capital (to risk-weighted assets), Actual, Amount 837,677 868,731
Core (Tier 1) capital (to adjusted total assets), Actual, Amount 837,677 868,731
Tangible capital (to adjusted total assets), Actual, Amount $ 837,677 $ 868,731
Total capital (to risk-weighted assets), Actual, Ratio 19.65% 23.61%
Tier 1 capital (to risk-weighted assets), Actual, Ratio 18.86% 22.64%
Core (Tier 1) capital (to adjusted total assets), Actual, Ratio 18.86% 22.64%
Tangible capital (to adjusted total assets), Actual, Ratio 11.76% 13.27%
Total capital (to risk-weighted assets), For Capital Adequacy Purposes, Amount $ 355,274 $ 306,958
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purposes, Amount 266,456 230,219
Core (Tier 1) capital (to adjusted total assets), For Capital Adequacy Purposes, Amount 199,842 172,664
Tangible capital (to adjusted total assets), For Capital Adequacy Purposes, Amount $ 284,877 $ 261,783
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%