Loans and Allowance for Credit Losses - Geographic and Collateral Concentration (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Geographical concentration | Loans, net
Concentration risk
Percentage of loan	100.00%	100.00%
Geographical concentration | Loans, net | Texas
Concentration risk
Percentage of loan	18.60%	20.20%
Geographical concentration | Loans, net | California
Concentration risk
Percentage of loan	11.40%	11.10%
Geographical concentration | Loans, net | Georgia
Concentration risk
Percentage of loan	7.10%	7.60%
Geographical concentration | Loans, net | Florida
Concentration risk
Percentage of loan	6.40%	6.30%
Geographical concentration | Loans, net | Arizona
Concentration risk
Percentage of loan	6.10%	6.80%
Geographical concentration | Loans, net | Oregon
Concentration risk
Percentage of loan	5.90%	4.40%
Geographical concentration | Loans, net | New York
Concentration risk
Percentage of loan	4.80%	5.50%
Geographical concentration | Loans, net | North Carolina
Concentration risk
Percentage of loan	4.10%	4.20%
Geographical concentration | Loans, net | Illinois
Concentration risk
Percentage of loan	3.70%	3.90%
Geographical concentration | Loans, net | Washington
Concentration risk
Percentage of loan	3.40%	1.60%
Geographical concentration | Loans, net | Other
Concentration risk
Percentage of loan	28.50%	28.40%
Collateral concentration
Concentration risk
Percentage of SBA loan	100.00%	100.00%
Collateral concentration | Lodging
Concentration risk
Percentage of SBA loan	23.40%	14.60%
Collateral concentration | Gasoline Service Stations
Concentration risk
Percentage of SBA loan	12.80%	2.50%
Collateral concentration | Eating Places
Concentration risk
Percentage of SBA loan	6.20%	3.70%
Collateral concentration | Child Day Care Services
Concentration risk
Percentage of SBA loan	5.60%	5.70%
Collateral concentration | Offices of Physicians
Concentration risk
Percentage of SBA loan	4.10%	7.50%
Collateral concentration | General Freight Trucking, Local
Concentration risk
Percentage of SBA loan	3.50%	2.50%
Collateral concentration | Grocery Stores
Concentration risk
Percentage of SBA loan	2.30%	1.60%
Collateral concentration | Coin-Operated Laundries and Drycleaners
Concentration risk
Percentage of SBA loan	1.90%	0.80%
Collateral concentration | Funeral Service and Crematories
Concentration risk
Percentage of SBA loan	1.40%	1.20%
Collateral concentration | Beer, Wine, and Liquor Stores
Concentration risk
Percentage of SBA loan	1.30%	1.00%
Collateral concentration | Other
Concentration risk
Percentage of SBA loan	37.50%	58.90%
Collateral concentration | Loans, net
Concentration risk
Percentage of loan	100.00%	100.00%
Collateral concentration | Loans, net | Multi-family
Concentration risk
Percentage of loan	60.90%	67.00%
Collateral concentration | Loans, net | SBA
Concentration risk
Percentage of loan	11.40%	5.80%
Collateral concentration | Loans, net | Mixed Use
Concentration risk
Percentage of loan	8.40%	8.10%
Collateral concentration | Loans, net | Office
Concentration risk
Percentage of loan	4.40%	4.90%
Collateral concentration | Loans, net | Industrial
Concentration risk
Percentage of loan	4.30%	5.00%
Collateral concentration | Loans, net | Retail
Concentration risk
Percentage of loan	4.30%	5.50%
Collateral concentration | Loans, net | Lodging
Concentration risk
Percentage of loan	1.60%	1.60%
Collateral concentration | Loans, net | Other
Concentration risk
Percentage of loan	4.70%	2.10%