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Fair Value of Financial Instruments - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Assets:    
HTM investment securities $ 1,097,096 $ 384,423
AFS investment securities 2,601,013 4,273,864
Total derivative assets 78,129 11,989
Accrued interest receivable 73,784 65,728
Liabilities:    
FHLB advances 1,000,000 550,000
Derivative liabilities 12,598 5,263
Recurring    
Assets:    
AFS investment securities 2,601,013 4,273,864
Equity securities 13,526  
Total derivative assets 8,948 11,989
Liabilities:    
Derivative liabilities 12,531  
Equity securities that are measured at NAV 12,600  
Level 1    
Assets:    
Cash and cash equivalents 1,101,249 304,703
HTM investment securities 0 0
AFS investment securities 0 0
Equity securities 925  
Loans held for sale 0 0
Loans held for investment, net 0 0
Total derivative assets 1 0
Accrued interest receivable 0 65,728
Liabilities:    
Deposit accounts 0 16,057,316
FHLB advances 0 0
Other borrowings   0
Subordinated debentures 0 0
Derivative liabilities 1 0
Accrued interest payable 0 2,366
Level 1 | Recurring    
Assets:    
AFS investment securities 0 0
Equity securities 925  
Total derivative assets 1 0
Liabilities:    
Derivative liabilities 1  
Level 1 | Interest-bearing time deposits with financial institutions    
Assets:    
Cash and cash equivalents 1,734 2,216
Level 2    
Assets:    
Cash and cash equivalents 0 0
HTM investment securities 1,097,096 384,423
AFS investment securities 2,601,013 4,273,864
Equity securities 0  
Loans held for sale 2,755 11,959
Loans held for investment, net 0 0
Total derivative assets 7,053 10,100
Accrued interest receivable 73,784 0
Liabilities:    
Deposit accounts 17,334,219 1,058,822
FHLB advances 982,695 550,093
Other borrowings   8,000
Subordinated debentures 327,609 350,359
Derivative liabilities 12,530 5,263
Accrued interest payable 14,661 0
Level 2 | Recurring    
Assets:    
AFS investment securities 2,601,013 4,273,864
Equity securities 0  
Total derivative assets 7,053 10,100
Liabilities:    
Derivative liabilities 12,530  
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
HTM investment securities 0 0
AFS investment securities 0 0
Equity securities 0  
Loans held for sale 0 0
Loans held for investment, net 13,846,403 14,392,684
Total derivative assets 1,894 1,889
Accrued interest receivable 0 0
Liabilities:    
Deposit accounts 0 0
FHLB advances 0 0
Other borrowings   0
Subordinated debentures 0 0
Derivative liabilities 0 0
Accrued interest payable 0 0
Level 3 | Recurring    
Assets:    
AFS investment securities 0 0
Equity securities 0  
Total derivative assets 1,894 1,889
Liabilities:    
Derivative liabilities 0  
Level 3 | Interest-bearing time deposits with financial institutions    
Assets:    
Cash and cash equivalents 0 0
Carrying Amount    
Assets:    
Cash and cash equivalents 1,101,249 304,703
HTM investment securities 1,388,103 381,674
AFS investment securities 2,601,013 4,273,864
Equity securities 13,526  
Loans held for sale 2,643 10,869
Loans held for investment, net 14,676,298 14,295,897
Total derivative assets 8,948 11,989
Accrued interest receivable 73,784 65,728
Liabilities:    
Deposit accounts 17,352,401 17,115,589
FHLB advances 1,000,000 550,000
Other borrowings   8,000
Subordinated debentures 331,204 330,567
Derivative liabilities 12,531 5,263
Accrued interest payable 14,661 2,366
Carrying Amount | Interest-bearing time deposits with financial institutions    
Assets:    
Cash and cash equivalents 1,734 2,216
Estimated Fair Value    
Assets:    
Cash and cash equivalents 1,101,249 304,703
HTM investment securities 1,097,096 384,423
AFS investment securities 2,601,013 4,273,864
Equity securities 13,526  
Loans held for sale 2,755 11,959
Loans held for investment, net 13,846,403 14,392,684
Total derivative assets 8,948 11,989
Accrued interest receivable 73,784 65,728
Liabilities:    
Deposit accounts 17,334,219 17,116,138
FHLB advances 982,695 550,093
Other borrowings   8,000
Subordinated debentures 327,609 350,359
Derivative liabilities 12,531 5,263
Accrued interest payable 14,661 2,366
Estimated Fair Value | Interest-bearing time deposits with financial institutions    
Assets:    
Cash and cash equivalents $ 1,734 $ 2,216