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Fair Value of Financial Instruments - Schedule of Estimated Fair Values and Carrying Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Financial assets:    
Net loans held for investment $ 9,154,498 $ 9,258,457
Interest receivable 52,781 52,715
Carrying amount    
Financial assets:    
Cash and cash equivalents 800,902 810,932
Investment securities 1,482,379 1,471,973
Net loans held for investment 9,154,498 9,258,457
Loans held for sale, at fair value 84,521 46,618
Interest receivable 52,781 52,715
Mortgage servicing rights 164,505 164,249
Derivatives 37,076 34,738
Financial liabilities:    
Without stated maturities 8,973,707 8,927,654
With stated maturities 1,494,295 1,620,633
Securities sold under agreements to repurchase and federal funds purchased 76,801 108,764
Bank Term Funding Program 130,000 130,000
Subordinated debt, net 130,511 129,645
Interest payable 20,145 18,809
Derivatives 34,967 38,215
 Fair Value    
Financial assets:    
Cash and cash equivalents 800,902 810,932
Investment securities 1,482,379 1,471,973
Net loans held for investment 8,854,724 9,068,518
Loans held for sale, at fair value 84,521 46,618
Interest receivable 52,781 52,715
Mortgage servicing rights 164,505 164,249
Derivatives 37,076 34,738
Financial liabilities:    
Without stated maturities 8,973,707 8,927,654
With stated maturities 1,487,664 1,614,400
Securities sold under agreements to repurchase and federal funds purchased 76,801 108,764
Bank Term Funding Program 129,543 130,000
Subordinated debt, net 124,113 122,671
Interest payable 20,145 18,809
Derivatives 34,967 38,215
 Fair Value | Level 1    
Financial assets:    
Cash and cash equivalents 800,902 810,932
Investment securities 0 0
Net loans held for investment 0 0
Loans held for sale, at fair value 0 0
Interest receivable 374 388
Mortgage servicing rights 0 0
Derivatives 0 0
Financial liabilities:    
Without stated maturities 8,973,707 8,927,654
With stated maturities 0 0
Securities sold under agreements to repurchase and federal funds purchased 76,801 108,764
Bank Term Funding Program 0 0
Subordinated debt, net 0 0
Interest payable 4,125 4,104
Derivatives 0 0
 Fair Value | Level 2    
Financial assets:    
Cash and cash equivalents 0 0
Investment securities 1,482,379 1,471,973
Net loans held for investment 0 0
Loans held for sale, at fair value 84,521 46,618
Interest receivable 8,056 8,551
Mortgage servicing rights 0 0
Derivatives 37,076 34,738
Financial liabilities:    
Without stated maturities 0 0
With stated maturities 1,487,664 1,614,400
Securities sold under agreements to repurchase and federal funds purchased 0 0
Bank Term Funding Program 129,543 130,000
Subordinated debt, net 0 0
Interest payable 14,520 13,205
Derivatives 34,967 38,215
 Fair Value | Level 3    
Financial assets:    
Cash and cash equivalents 0 0
Investment securities 0 0
Net loans held for investment 8,854,724 9,068,518
Loans held for sale, at fair value 0 0
Interest receivable 44,351 43,776
Mortgage servicing rights 164,505 164,249
Derivatives 0 0
Financial liabilities:    
Without stated maturities 0 0
With stated maturities 0 0
Securities sold under agreements to repurchase and federal funds purchased 0 0
Bank Term Funding Program 0 0
Subordinated debt, net 124,113 122,671
Interest payable 1,500 1,500
Derivatives $ 0 $ 0