Loans and Allowance for Credit Losses on Loans - Aging Analysis Of The Recorded Investment In Loans (Details) $ in Thousands	Mar. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($)
Aging analysis of loan portfolio
Loans	$ 10,766,225	$ 10,199,553
Number of delinquent loans classified as held for sale \| loan	2
Loan as held for sale	$ 30,200
Total Past Due
Aging analysis of loan portfolio
Loans	188,742	183,529
30-59 Days Past Due
Aging analysis of loan portfolio
Loans	31,424	42,975
60-89 Days Past Due
Aging analysis of loan portfolio
Loans	26,292	58,737
Greater Than 90 Days
Aging analysis of loan portfolio
Loans	131,026	81,817
Current.
Aging analysis of loan portfolio
Loans	10,577,483	10,016,024
Mortgage warehouse lines of credit
Aging analysis of loan portfolio
Loans	1,142,994	752,468
Mortgage warehouse lines of credit \| Current.
Aging analysis of loan portfolio
Loans	1,142,994	752,468
Residential real estate
Aging analysis of loan portfolio
Loans	1,321,300	1,324,305
Residential real estate \| Total Past Due
Aging analysis of loan portfolio
Loans	5,488	6,936
Residential real estate \| 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	4,588	4,557
Residential real estate \| 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	682
Residential real estate \| Greater Than 90 Days
Aging analysis of loan portfolio
Loans	218	2,379
Residential real estate \| Current.
Aging analysis of loan portfolio
Loans	1,315,812	1,317,369
Healthcare financing
Aging analysis of loan portfolio
Loans	2,464,685	2,356,689
Healthcare financing \| Total Past Due
Aging analysis of loan portfolio
Loans	74,333	83,274
Healthcare financing \| 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	25,600	47,275
Healthcare financing \| Greater Than 90 Days
Aging analysis of loan portfolio
Loans	48,733	35,999
Healthcare financing \| Current.
Aging analysis of loan portfolio
Loans	2,390,352	2,273,415
Multi-family financing
Aging analysis of loan portfolio
Loans	4,096,606	4,006,160
Multi-family financing \| Total Past Due
Aging analysis of loan portfolio
Loans	103,780	88,882
Multi-family financing \| 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	24,870	38,218
Multi-family financing \| 60-89 Days Past Due
Aging analysis of loan portfolio
Loans		11,055
Multi-family financing \| Greater Than 90 Days
Aging analysis of loan portfolio
Loans	78,910	39,609
Multi-family financing \| Current.
Aging analysis of loan portfolio
Loans	3,992,826	3,917,278
Commercial and commercial real estate
Aging analysis of loan portfolio
Loans	1,666,751	1,643,081
Commercial and commercial real estate \| Total Past Due
Aging analysis of loan portfolio
Loans	4,928	4,230
Commercial and commercial real estate \| 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	1,922	172
Commercial and commercial real estate \| 60-89 Days Past Due
Aging analysis of loan portfolio
Loans		393
Commercial and commercial real estate \| Greater Than 90 Days
Aging analysis of loan portfolio
Loans	3,006	3,665
Commercial and commercial real estate \| Current.
Aging analysis of loan portfolio
Loans	1,661,823	1,638,851
Agricultural production and real estate
Aging analysis of loan portfolio
Loans	65,977	103,150
Agricultural production and real estate \| Total Past Due
Aging analysis of loan portfolio
Loans	213	185
Agricultural production and real estate \| 30-59 Days Past Due
Aging analysis of loan portfolio
Loans	44	27
Agricultural production and real estate \| 60-89 Days Past Due
Aging analysis of loan portfolio
Loans	10	11
Agricultural production and real estate \| Greater Than 90 Days
Aging analysis of loan portfolio
Loans	159	147
Agricultural production and real estate \| Current.
Aging analysis of loan portfolio
Loans	65,764	102,965
Consumer and margin loans
Aging analysis of loan portfolio
Loans	7,912	13,700
Consumer and margin loans \| Total Past Due
Aging analysis of loan portfolio
Loans		22
Consumer and margin loans \| 30-59 Days Past Due
Aging analysis of loan portfolio
Loans		1
Consumer and margin loans \| 60-89 Days Past Due
Aging analysis of loan portfolio
Loans		3
Consumer and margin loans \| Greater Than 90 Days
Aging analysis of loan portfolio
Loans		18
Consumer and margin loans \| Current.
Aging analysis of loan portfolio
Loans	$ 7,912	$ 13,678