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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Schedule of Loan Purchases and Sales (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchases $ 1,907,222 $ 270,179 $ 1,164,119
Sales $ 398,015 $ 26,362 $ 268,872
Loans held-for-investment, purchase price as a percentage of loans outstanding 100.80% 100.30% 100.30%
Gain on sale of loans $ 12,900 $ 2,000 $ 2,800
Loans receivable, PPP      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchases 1,536,213 0 0
Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchases 92,939 495 105,858
Sales 63,932 0 230,285
Multi-family      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sales 36,900 0 0
Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sales 47,142 6,940 22,267
Commercial real estate owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sales 19,420 0 16,320
Commercial real estate non-owner occupied      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Sales 18,366 17,600 0
Installment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchases 278,070 269,684 1,058,261
Sales $ 212,255 $ 1,822 $ 0