Loans and Allowance for Credit Losses - Collateral dependent loans and related ACL (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021
Related allowance for credit losses	$ 37,483	$ 37,418	$ 33,192	$ 32,529	$ 32,543	$ 33,222
Collateral-dependent Loans | 1- to 4-family residential loans
Amortized cost	848		864
Related allowance for credit losses	176		193
Residential Real Estate
Related allowance for credit losses	12,499	$ 11,937	8,908	$ 10,757	$ 10,634	$ 11,192
Residential Real Estate | Collateral-dependent Loans
Amortized cost	848		864
Related allowance for credit losses	$ 176		$ 193