Loans and Allowance for Credit Losses on Loans - Aging Analysis Of The Recorded Investment In Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Aging analysis of loan portfolio
Loans	$ 8,627,048	$ 7,470,872
Total Past Due
Aging analysis of loan portfolio
Loans	83,491	39,752
30-59 Days Past Due
Aging analysis of loan portfolio
Loans	3,065	13,721
60-89 Days Past Due
Aging analysis of loan portfolio
Loans	15,923	176
Greater Than 90 Days
Aging analysis of loan portfolio
Loans	64,503	25,855
Current.
Aging analysis of loan portfolio
Loans	8,543,557	7,431,120
Mortgage warehouse lines of credit
Aging analysis of loan portfolio
Loans	604,445	464,785
Mortgage warehouse lines of credit | Current.
Aging analysis of loan portfolio
Loans	604,445	464,785
Residential real estate
Aging analysis of loan portfolio
Loans	1,215,252	1,178,401
Residential real estate | Total Past Due
Aging analysis of loan portfolio
Loans	5,900	4,477
Residential real estate | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	2,573	4,053
Residential real estate | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	2,409	152
Residential real estate | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	918	272
Residential real estate | Current.
Aging analysis of loan portfolio
Loans	1,209,352	1,173,924
Healthcare financing
Aging analysis of loan portfolio
Loans	1,941,204	1,604,341
Healthcare financing | Total Past Due
Aging analysis of loan portfolio
Loans	21,783	21,783
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	1,919,421	1,582,558
Multi-family financing
Aging analysis of loan portfolio
Loans	3,566,530	3,135,535
Multi-family financing | Total Past Due
Aging analysis of loan portfolio
Loans	49,735
Multi-family financing | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	12,975
Multi-family financing | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	36,760
Multi-family financing | Current.
Aging analysis of loan portfolio
Loans	3,516,795	3,135,535
Commercial and commercial real estate
Aging analysis of loan portfolio
Loans	1,194,320	978,661
Commercial and commercial real estate | Total Past Due
Aging analysis of loan portfolio
Loans	4,482	8,537
Commercial and commercial real estate | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	209	4,759
Commercial and commercial real estate | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	495
Commercial and commercial real estate | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	3,778	3,778
Commercial and commercial real estate | Current.
Aging analysis of loan portfolio
Loans	1,189,838	970,124
Agricultural production and real estate
Aging analysis of loan portfolio
Loans	89,516	95,651
Agricultural production and real estate | Total Past Due
Aging analysis of loan portfolio
Loans	1,521	4,903
Agricultural production and real estate | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	236	4,903
Agricultural production and real estate | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	43
Agricultural production and real estate | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	1,242
Agricultural production and real estate | Current.
Aging analysis of loan portfolio
Loans	87,995	90,748
Consumer and margin loans
Aging analysis of loan portfolio
Loans	15,781	13,498
Consumer and margin loans | Total Past Due
Aging analysis of loan portfolio
Loans	70	52
Consumer and margin loans | 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	47	6
Consumer and margin loans | 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	1	24
Consumer and margin loans | Greater Than 90 Days
Aging analysis of loan portfolio
Loans	22	22
Consumer and margin loans | Current.
Aging analysis of loan portfolio
Loans	$ 15,711	$ 13,446