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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 394,905 $ 538,072
Deposits 14,922,839 14,048,764
Federal funds purchased and securities sold under repurchase agreements 146,417 164,519
Other borrowings 94,889 168,252
Subordinated notes 122,987 122,921
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 2,175,058 1,952,554
Securities held to maturity 394,905 538,072
Deposits 14,922,839 14,048,764
Federal funds purchased and securities sold under repurchase agreements 146,417 164,519
Other borrowings 94,889 168,252
Subordinated notes 122,987 122,921
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 2,175,058 1,952,554
Securities held to maturity 411,132 563,115
Deposits 14,923,369 14,052,863
Federal funds purchased and securities sold under repurchase agreements 146,417 164,519
Other borrowings 94,888 168,252
Subordinated notes 129,375 127,500
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 10,117,312 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 $ 10,072,186 $ 10,312,395