Loans and Allowance for Credit Losses on Loans - Amortized cost basis and ACL (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	$ 7,470,872
Allowance for credit losses on loans	44,014
Collateral Dependent Loans
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	64,825
Allowance for credit losses on loans	1,181
Real Estate
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	58,927
Accounts Receivable Or Equipment
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	4,917
Other Collateralized Assets
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	981
Mortgage warehouse lines of credit
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	464,785
Allowance for credit losses on loans	1,249
Residential real estate
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	1,178,401
Allowance for credit losses on loans	7,029
Residential real estate | Collateral Dependent Loans
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	246
Allowance for credit losses on loans	31
Residential real estate | Real Estate
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	237
Residential real estate | Other Collateralized Assets
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	9
Multi-family financing
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	3,135,535
Allowance for credit losses on loans	16,781
Multi-family financing | Collateral Dependent Loans
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	36,760
Allowance for credit losses on loans	173
Multi-family financing | Real Estate
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	36,760
Healthcare financing
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	1,604,341
Allowance for credit losses on loans	9,882
Healthcare financing | Collateral Dependent Loans
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	21,783
Allowance for credit losses on loans	134
Healthcare financing | Real Estate
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	21,783
Commercial and commercial real estate
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	978,661
Allowance for credit losses on loans	8,326
Commercial and commercial real estate | Collateral Dependent Loans
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	5,883
Allowance for credit losses on loans	842
Commercial and commercial real estate | Accounts Receivable Or Equipment
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	4,917
Commercial and commercial real estate | Other Collateralized Assets
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	966
Agricultural production and real estate
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	95,651
Allowance for credit losses on loans	565
Agricultural production and real estate | Collateral Dependent Loans
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	147
Allowance for credit losses on loans	1
Agricultural production and real estate | Real Estate
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	147
Consumer and margin loans
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	13,498
Allowance for credit losses on loans	182
Consumer and margin loans | Collateral Dependent Loans
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	6
Consumer and margin loans | Other Collateralized Assets
Loans and Allowance for Credit Losses on Loans
Amortized Cost Basis	$ 6