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Fair Value - Estimated fair value and related carrying amount, of the Company's financial instruments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Financial liabilities:      
Other derivative financial instruments (mortgage banking related) $ (319,824) $ 60,536  
Carrying Amount      
Financial assets:      
Cash and cash equivalents 6,298,323   $ 4,609,255
Trading securities 61,294   10,674
Investment securities 6,433,631   4,446,657
Loans held for sale 242,813   290,467
Loans, net of allowance for loan losses 23,474,805   24,206,825
Accrued interest receivable 93,524   107,601
Mortgage servicing rights 60,922   43,820
Interest rate swap - non-designated hedge 480,600   802,763
Other derivative financial instruments (mortgage banking related) 8,485   11,136
Financial liabilities:      
Deposits 33,560,558   30,693,882
Federal funds purchased and securities sold under agreements to repurchase 859,736   779,666
Other borrowings 326,807   390,179
Accrued interest payable 6,529   7,103
Interest rate swap - non-designated hedge 482,104   804,832
Other derivative financial instruments (mortgage banking related) 2,903    
Fair Value      
Financial assets:      
Cash and cash equivalents 6,298,323   4,609,255
Trading securities 61,294   10,674
Investment securities 6,399,330   4,448,300
Loans held for sale 242,813   290,467
Loans, net of allowance for loan losses 23,741,241   24,757,859
Accrued interest receivable 93,524   107,601
Mortgage servicing rights 60,922   43,820
Interest rate swap - non-designated hedge 480,600   802,763
Other derivative financial instruments (mortgage banking related) 8,485   11,136
Financial liabilities:      
Deposits 33,561,012   30,719,416
Federal funds purchased and securities sold under agreements to repurchase 859,736   779,666
Other borrowings 331,707   386,126
Accrued interest payable 6,529   7,103
Interest rate swap - non-designated hedge 482,104   804,832
Other derivative financial instruments (mortgage banking related) 2,903    
Commitments to extend credit | Fair Value      
Financial liabilities:      
Commitments to extend credit 79,998   136,726
Quoted Prices In Active Markets for Identical Assets (Level 1)      
Financial assets:      
Cash and cash equivalents 6,298,323   4,609,255
Investment securities 160,592   160,443
Significant Other Observable Inputs (Level 2)      
Financial assets:      
Trading securities 61,294   10,674
Investment securities 6,238,738   4,287,857
Loans held for sale 242,813   290,467
Accrued interest receivable 16,984   12,952
Interest rate swap - non-designated hedge 480,600   802,763
Other derivative financial instruments (mortgage banking related) 8,485   11,136
Financial liabilities:      
Deposits 33,561,012   30,719,416
Federal funds purchased and securities sold under agreements to repurchase 859,736   779,666
Other borrowings 331,707   386,126
Accrued interest payable 6,529   7,103
Interest rate swap - non-designated hedge 482,104   804,832
Other derivative financial instruments (mortgage banking related) 2,903    
Significant Other Observable Inputs (Level 2) | Commitments to extend credit      
Financial liabilities:      
Commitments to extend credit 79,998   136,726
Significant Unobservable Inputs (Level 3)      
Financial assets:      
Loans, net of allowance for loan losses 23,741,241   24,757,859
Accrued interest receivable 76,540   94,649
Mortgage servicing rights $ 60,922   $ 43,820