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Fair Value of Financial Instruments - Fair Value Estimates (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Assets    
Investments held-to-maturity $ 19,820 $ 25,013
Investment securities available-for-sale 4,487,447 3,931,115
Accrued interest receivable 67,529 74,574
Level 1    
Assets    
Cash and cash equivalents 631,888 880,766
Investments held-to-maturity 0 0
Investment securities available-for-sale 0 0
Loans held for sale 0 0
Loans held for investment, net 0 0
Derivative assets 0 0
Accrued interest receivable 67,529 74,574
Liabilities    
Deposit accounts 15,755,399 14,587,335
FHLB advances   0
Subordinated debentures 0 0
Derivative liabilities 0 0
Accrued interest payable 6,216 6,569
Level 1 | Interest-bearing time deposits with financial institutions    
Assets    
Cash and cash equivalents 2,708 2,845
Level 2    
Assets    
Cash and cash equivalents 0 0
Investments held-to-maturity 19,820 25,013
Investment securities available-for-sale 4,487,447 3,931,115
Loans held for sale 5,208 645
Loans held for investment, net 0 0
Derivative assets 6,712 12,053
Accrued interest receivable 0 0
Liabilities    
Deposit accounts 1,262,149 1,631,047
FHLB advances   31,564
Subordinated debentures 515,431 544,436
Derivative liabilities 6,716 12,066
Accrued interest payable 0 0
Level 2 | Interest-bearing time deposits with financial institutions    
Assets    
Cash and cash equivalents 0 0
Level 3    
Assets    
Cash and cash equivalents 0 0
Investments held-to-maturity 0 0
Investment securities available-for-sale 0 0
Loans held for sale 0 0
Loans held for investment, net 13,750,527 13,351,092
Derivative assets 1,903 1,914
Accrued interest receivable 0 0
Liabilities    
Deposit accounts 0 0
FHLB advances   0
Subordinated debentures 0 0
Derivative liabilities 0 0
Accrued interest payable 0 0
Level 3 | Interest-bearing time deposits with financial institutions    
Assets    
Cash and cash equivalents 0 0
Carrying Amount    
Assets    
Cash and cash equivalents 631,888 880,766
Investments held-to-maturity 18,933 23,732
Investment securities available-for-sale 4,487,447 3,931,115
Loans held for sale 4,714 601
Loans held for investment, net 13,594,598 13,236,433
Derivative assets 8,615 13,967
Accrued interest receivable 67,529 74,574
Liabilities    
Deposit accounts 17,015,097 16,214,177
FHLB advances   31,000
Subordinated debentures 476,622 501,511
Derivative liabilities 6,716 12,066
Accrued interest payable 6,216 6,569
Carrying Amount | Interest-bearing time deposits with financial institutions    
Assets    
Cash and cash equivalents 2,708 2,845
Estimated Fair Value    
Assets    
Cash and cash equivalents 631,888 880,766
Investments held-to-maturity 19,820 25,013
Investment securities available-for-sale 4,487,447 3,931,115
Loans held for sale 5,208 645
Loans held for investment, net 13,750,527 13,351,092
Derivative assets 8,615 13,967
Accrued interest receivable 67,529 74,574
Liabilities    
Deposit accounts 17,017,548 16,218,382
FHLB advances   31,564
Subordinated debentures 515,431 544,436
Derivative liabilities 6,716 12,066
Accrued interest payable 6,216 6,569
Estimated Fair Value | Interest-bearing time deposits with financial institutions    
Assets    
Cash and cash equivalents $ 2,708 $ 2,845