Loans and Allowance for Credit Losses on Loans - Aging Analysis Of The Recorded Investment In Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Aging analysis of loan portfolio
Loans	$ 9,977,545	$ 7,470,872
Total Past Due
Aging analysis of loan portfolio
Loans	125,372	39,752
30-59 Days Past Due
Aging analysis of loan portfolio
Loans	39,368	13,721
60-89 Days Past Due
Aging analysis of loan portfolio
Loans	25,839	176
Greater Than 90 Days
Aging analysis of loan portfolio
Loans	60,165	25,855
Current.
Aging analysis of loan portfolio
Loans	9,852,173	7,431,120
Mortgage warehouse lines of credit
Aging analysis of loan portfolio
Loans	1,022,692	464,785
Mortgage warehouse lines of credit | Current.
Aging analysis of loan portfolio
Loans	1,022,692	464,785
Residential real estate
Aging analysis of loan portfolio
Loans	1,358,908	1,178,401
Residential real estate | Total Past Due
Aging analysis of loan portfolio
Loans	2,673	4,477
Residential real estate | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	749	4,053
Residential real estate | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	137	152
Residential real estate | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	1,787	272
Residential real estate | Current.
Aging analysis of loan portfolio
Loans	1,356,235	1,173,924
Healthcare financing
Aging analysis of loan portfolio
Loans	2,218,559	1,604,341
Healthcare financing | Total Past Due
Aging analysis of loan portfolio
Loans	79,383	21,783
Healthcare financing | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	32,000
Healthcare financing | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	25,600
Healthcare financing | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	21,783	21,783
Healthcare financing | Current.
Aging analysis of loan portfolio
Loans	2,139,176	1,582,558
Multi-family financing
Aging analysis of loan portfolio
Loans	3,709,320	3,135,535
Multi-family financing | Total Past Due
Aging analysis of loan portfolio
Loans	38,934
Multi-family financing | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	6,600
Multi-family financing | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	32,334
Multi-family financing | Current.
Aging analysis of loan portfolio
Loans	3,670,386	3,135,535
Commercial and commercial real estate
Aging analysis of loan portfolio
Loans	1,560,031	978,661
Commercial and commercial real estate | Total Past Due
Aging analysis of loan portfolio
Loans	4,139	8,537
Commercial and commercial real estate | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans		4,759
Commercial and commercial real estate | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	44
Commercial and commercial real estate | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	4,095	3,778
Commercial and commercial real estate | Current.
Aging analysis of loan portfolio
Loans	1,555,892	970,124
Agricultural production and real estate
Aging analysis of loan portfolio
Loans	96,490	95,651
Agricultural production and real estate | Total Past Due
Aging analysis of loan portfolio
Loans	205	4,903
Agricultural production and real estate | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans		4,903
Agricultural production and real estate | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	58
Agricultural production and real estate | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	147
Agricultural production and real estate | Current.
Aging analysis of loan portfolio
Loans	96,285	90,748
Consumer and margin loans
Aging analysis of loan portfolio
Loans	11,545	13,498
Consumer and margin loans | Total Past Due
Aging analysis of loan portfolio
Loans	38	52
Consumer and margin loans | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	19	6
Consumer and margin loans | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans		24
Consumer and margin loans | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	19	22
Consumer and margin loans | Current.
Aging analysis of loan portfolio
Loans	$ 11,507	$ 13,446