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Fair Value of Assets and Liabilities - Carrying Amount and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Carrying Amount    
Financial assets    
Cash and cash equivalents $ 437,686 $ 633,142
Debt securities, held-to-maturity 1,199,164 189,836
Loans receivable, net of ACL 13,259,366 10,964,453
Total financial assets 14,896,216 11,787,431
Financial liabilities    
Term deposits 1,036,077 978,779
Repurchase agreements and other borrowed funds 1,064,888 1,037,651
Subordinated debentures 132,620 139,959
Total financial liabilities 2,233,585 2,156,389
Estimated Fair Value | Level 1    
Financial assets    
Cash and cash equivalents 437,686 633,142
Debt securities, held-to-maturity 0 0
Loans receivable, net of ACL 0 0
Total financial assets 437,686 633,142
Financial liabilities    
Term deposits 0 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 1,220,883 203,216
Loans receivable, net of ACL 0 0
Total financial assets 1,220,883 203,216
Financial liabilities    
Term deposits 1,040,100 983,491
Repurchase agreements and other borrowed funds 1,064,888 1,037,651
Subordinated debentures 131,513 123,944
Total financial liabilities 2,236,501 2,145,086
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 13,422,898 11,233,002
Total financial assets 13,422,898 11,233,002
Financial liabilities    
Term deposits 0 0
Repurchase agreements and other borrowed funds 0 0
Subordinated debentures 0 0
Total financial liabilities $ 0 $ 0