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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 433,012 $ 538,072
Deposits 14,632,084 14,048,764
Federal funds purchased and securities sold under repurchase agreements 157,176 164,519
Other borrowings 117,223 168,252
Subordinated notes 122,932 122,921
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 2,267,224 1,952,554
Securities held to maturity 433,012 538,072
Deposits 14,632,084 14,048,764
Federal funds purchased and securities sold under repurchase agreements 157,176 164,519
Other borrowings 117,223 168,252
Subordinated notes 122,932 122,921
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 2,267,224 1,952,554
Securities held to maturity 452,288 563,115
Deposits 14,633,322 14,052,863
Federal funds purchased and securities sold under repurchase agreements 157,176 164,519
Other borrowings 117,221 168,252
Subordinated notes 128,750 127,500
Junior subordinated debt securities 48,866 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 10,214,956 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 $ 10,183,509 $ 10,312,395