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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 738,099 $ 909,643
Net LHFI 9,251,351 8,756,578
Acquired loans 71,786 105,701
Deposits 11,245,557 11,364,411
Federal funds purchased and securities sold under repurchase agreements 256,020 50,471
Other borrowings 85,396 79,885
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 358,916 350,391
Securities held to maturity 738,099 909,643
Deposits 11,245,557 11,364,411
Federal funds purchased and securities sold under repurchase agreements 256,020 50,471
Other borrowings 85,396 79,885
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 358,916 350,391
Securities held to maturity 746,202 889,733
Deposits 11,250,071 11,365,203
Federal funds purchased and securities sold under repurchase agreements 256,020 50,471
Other borrowings 85,374 79,827
Junior subordinated debt securities 50,722 53,196
Level 3 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 9,251,351 8,756,578
Acquired loans 71,786 105,701
Level 3 [Member] | Estimate Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 9,235,674 8,757,817
Acquired loans $ 71,786 $ 105,701