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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Financial Assets:    
Equity investments without readily determinable fair values $ 38,000 $ 31,037
Financial Liabilities:    
Investment securities held to maturity, at amortized cost; fair value of $258,677 and $0 at September 30, 2022 and December 31, 2021, respectively 271,185 0
Debt Securities, Held-to-maturity, Fair Value 258,677 0
Level 1 | Carrying Amount    
Financial Assets:    
Cash and cash equivalents 331,336 316,266
Financial Liabilities:    
Convertible notes, net 216,913 216,209
Level 1 | Estimated Fair Value    
Financial Assets:    
Cash and cash equivalents 331,336 316,266
Financial Liabilities:    
Convertible notes, net 211,562 214,612
Level 2/3 | Carrying Amount    
Financial Assets:    
Accrued interest receivable 42,363 41,842
Level 2/3 | Estimated Fair Value    
Financial Assets:    
Accrued interest receivable 42,363 41,842
Level 2 | Carrying Amount    
Financial Assets:    
Interest bearing deposits in other financial institutions 3,968 12,851
Equity investments without readily determinable fair values 38,030  
Loans held for sale 41,989 99,049
Customers’ liabilities on acceptances 570 1,521
Financial Liabilities:    
Noninterest bearing deposits 5,590,952 5,751,870
Saving and other interest bearing demand deposits 6,202,934 6,500,227
Time deposits 3,708,323 2,788,353
FHLB and FRB borrowings, Fair Value Disclosure 1,072,000  
FHLB and FRB borrowings   300,000
Subordinated debentures 106,258 105,354
Accrued interest payable 11,713 4,272
Acceptances outstanding 570 1,521
Level 2 | Estimated Fair Value    
Financial Assets:    
Interest bearing deposits in other financial institutions 3,945 12,853
Equity investments without readily determinable fair values 38,030 31,037
Loans held for sale 43,973 103,767
Customers’ liabilities on acceptances 570 1,521
Financial Liabilities:    
Noninterest bearing deposits 5,590,952 5,751,870
Saving and other interest bearing demand deposits 6,202,934 6,500,227
Time deposits 3,706,939 2,790,596
FHLB and FRB borrowings, Fair Value Disclosure 1,072,080  
FHLB and FRB borrowings   301,936
Subordinated debentures 107,870 117,961
Accrued interest payable 11,713 4,272
Acceptances outstanding 570 1,521
Level 3 | Carrying Amount    
Financial Assets:    
Loans receivable, net 15,330,626 13,812,193
Servicing assets, net 11,601 10,418
Level 3 | Estimated Fair Value    
Financial Assets:    
Loans receivable, net 14,937,811 13,698,579
Servicing assets, net $ 16,650 $ 13,500