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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 493,738 $ 538,072
Deposits 14,383,440 14,048,764
Federal funds purchased and securities sold under repurchase agreements 160,991 164,519
Other borrowings 145,994 168,252
Subordinated notes 122,877 122,921
Junior subordinated debt securities 61,856 61,856
Level 2 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 1,774,541 1,952,554
Securities held to maturity 493,738 538,072
Deposits 14,383,440 14,048,764
Federal funds purchased and securities sold under repurchase agreements 160,991 164,519
Other borrowings 145,994 168,252
Subordinated notes 122,877 122,921
Junior subordinated debt securities 61,856 61,856
Level 2 [Member] | Estimate Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments 1,774,541 1,952,554
Securities held to maturity 515,296 563,115
Deposits 14,385,049 14,052,863
Federal funds purchased and securities sold under repurchase agreements 160,991 164,519
Other borrowings 145,993 168,252
Subordinated notes 128,438 127,500
Junior subordinated debt securities 46,392 46,083
Level 3 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI and PPP loans 10,554,238 10,317,352
Level 3 [Member] | Estimate Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI and PPP loans $ 10,534,228 $ 10,312,395