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Loans and Leases Receivable and Allowance for Credit Losses - Schedule of Loan Purchases and Sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchases $ 270,179 $ 1,164,119 $ 398,468
Sales $ 26,362 $ 268,872 $ 107,119
Loans held-for-investment, purchase price as a percentage of loans outstanding 100.30% 100.30% 99.90%
Gain on sale of loans $ 2,000 $ 2,800 $ 3,300
Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchases 495 105,858 368,402
Sales 0 230,285 0
Multi-family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sales 0 0 54,638
Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sales 6,940 22,267 32,263
Commercial real estate owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sales 0 16,320 20,218
Commercial real estate non-owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sales 17,600 0 0
Installment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchases 269,684 1,058,261 30,066
Sales $ 1,822 $ 0 $ 0