Disclosures about Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financial assets:
Loans held for sale	$ 41,991	$ 48,583
Carrying value per balance sheet
Financial assets:
Cash and cash equivalents	258,146	1,032,614
Securities purchased under agreements to resell	3,520	5,888
FHLB stock	39,130	29,588
Loans held for sale	2,717,125	3,254,616
Loans receivable, net	7,033,203	5,751,319
Interest receivable	26,184	24,103
Financial liabilities:
Deposits	8,299,738	8,982,613
Short-term subordinated debt	19,000	17,000
FHLB advances	851,904	556,954
Other borrowing	570,000	460,000
Interest payable	3,805	1,469
Estimated fair value
Financial assets:
Cash and cash equivalents	258,146	1,032,614
Securities purchased under agreements to resell	3,520	5,888
FHLB stock	39,130	29,588
Loans held for sale	2,717,125	3,254,616
Loans receivable, net	7,046,313	5,731,500
Interest receivable	26,184	24,103
Financial liabilities:
Deposits	8,294,601	8,982,680
Short-term subordinated debt	19,000	17,000
FHLB advances	851,711	556,925
Other borrowing	570,000	460,000
Interest payable	3,805	1,469
Level 1 | Estimated fair value
Financial assets:
Cash and cash equivalents	258,146	1,032,614
Financial liabilities:
Deposits	6,829,667	7,783,553
Level 2 | Estimated fair value
Financial assets:
Securities purchased under agreements to resell	3,520	5,888
FHLB stock	39,130	29,588
Loans held for sale	2,717,125	3,254,616
Interest receivable	26,184	24,103
Financial liabilities:
Deposits	1,464,934	1,199,127
Short-term subordinated debt	19,000	17,000
FHLB advances	851,711	556,925
Other borrowing	570,000	460,000
Interest payable	3,805	1,469
Level 3 | Estimated fair value
Financial assets:
Loans receivable, net	$ 7,046,313	$ 5,731,500