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Fair Value of Assets and Liabilities - Carrying Amount and Estimated Fair Value of Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Carrying Amount    
Financial assets    
Cash and cash equivalents $ 436,805 $ 437,686
Debt securities, held-to-maturity 3,576,941 1,199,164
Loans receivable, net of ACL 13,554,860 13,259,366
Total financial assets 17,568,606 14,896,216
Financial liabilities    
Term deposits 995,147 1,036,077
FHLB advances 80,000  
Repurchase agreements and other borrowed funds 1,015,737 1,064,888
Subordinated debentures 132,661 132,620
Total financial liabilities 2,223,545 2,233,585
Estimated Fair Value | Level 1    
Financial assets    
Cash and cash equivalents 436,805 437,686
Debt securities, held-to-maturity 0 0
Loans receivable, net of ACL 0 0
Total financial assets 436,805 437,686
Financial liabilities    
Term deposits 0 0
FHLB advances 0  
Repurchase agreements and other borrowed funds 0 0
Subordinated debentures 0 0
Total financial liabilities 0 0
Estimated Fair Value | Level 2    
Financial assets    
Cash and cash equivalents 0 0
Debt securities, held-to-maturity 3,394,832 1,220,883
Loans receivable, net of ACL 0 0
Total financial assets 3,394,832 1,220,883
Financial liabilities    
Term deposits 998,569 1,040,100
FHLB advances 80,000  
Repurchase agreements and other borrowed funds 1,015,737 1,064,888
Subordinated debentures 130,492 131,513
Total financial liabilities 2,224,798 2,236,501
Estimated Fair Value | Level 3    
Financial assets    
Cash and cash equivalents 0 0
Debt securities, held-to-maturity 0 0
Loans receivable, net of ACL 13,469,234 13,422,898
Total financial assets 13,469,234 13,422,898
Financial liabilities    
Term deposits 0 0
FHLB advances 0  
Repurchase agreements and other borrowed funds 0 0
Subordinated debentures 0 0
Total financial liabilities $ 0 $ 0