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Fair Value Measurements - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Financial Assets:    
Equity investments without readily determinable fair values $ 26,700 $ 26,400
Level 1 | Carrying Amount    
Financial Assets:    
Cash and cash equivalents 609,795 459,606
Financial Liabilities:    
Convertible notes, net 196,977  
Level 1 | Estimated Fair Value    
Financial Assets:    
Cash and cash equivalents 609,795 459,606
Financial Liabilities:    
Convertible notes, net 199,030  
Level 2/3 | Carrying Amount    
Financial Assets:    
Accrued interest receivable 33,980 32,225
Level 2/3 | Carrying Amount | Other investments    
Financial Assets:    
Interest bearing deposits in other financial institutions 30,632 29,409
Level 2/3 | Estimated Fair Value    
Financial Assets:    
Accrued interest receivable 33,980 32,225
Level 2/3 | Estimated Fair Value | Other investments    
Financial Assets:    
Interest bearing deposits in other financial institutions 30,714 29,374
Level 2 | Carrying Amount    
Financial Assets:    
Equity investments without readily determinable fair values 26,689 26,430
Loans held for sale 6,426 25,128
Customers’ liabilities on acceptances 1,696 2,281
Financial Liabilities:    
Noninterest bearing deposits 3,009,218 3,022,633
Saving and other interest bearing demand deposits 3,482,806 3,262,399
Time deposits 5,680,360 5,870,624
FHLB advances 695,000 821,280
Convertible debt   194,543
Subordinated debentures 102,477 101,929
Accrued interest payable 36,987 31,374
Acceptances outstanding 1,696 2,281
Level 2 | Estimated Fair Value    
Financial Assets:    
Equity investments without readily determinable fair values 26,689 26,430
Loans held for sale 6,516 25,943
Customers’ liabilities on acceptances 1,696 2,281
Financial Liabilities:    
Noninterest bearing deposits 3,009,218 3,022,633
Saving and other interest bearing demand deposits 3,482,806 3,262,399
Time deposits 5,707,901 5,889,030
FHLB advances 697,013 810,812
Convertible debt   180,525
Subordinated debentures 117,726 116,542
Accrued interest payable 36,987 31,374
Acceptances outstanding 1,696 2,281
Level 3 | Carrying Amount    
Financial Assets:    
Loans receivable—net 11,883,068 12,005,558
Servicing assets, net 19,997 23,132
Level 3 | Estimated Fair Value    
Financial Assets:    
Loans receivable—net 11,756,995 11,913,906
Servicing assets, net $ 21,693 $ 24,762