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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 884,319 $ 909,643
Net LHFI 8,916,009 8,756,578
Acquired loans 91,904 105,701
Deposits 11,534,815 11,364,411
Federal funds purchased and securities sold under repurchase agreements 46,867 50,471
Other borrowings 83,265 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 454,047 350,391
Securities held to maturity 884,319 909,643
Deposits 11,534,815 11,364,411
Federal funds purchased and securities sold under repurchase agreements 46,867 50,471
Other borrowings 83,265 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 454,047 350,391
Securities held to maturity 874,858 889,733
Deposits 11,535,520 11,365,203
Federal funds purchased and securities sold under repurchase agreements 46,867 50,471
Other borrowings 83,223 79,827
Junior subordinated debt securities 51,959 53,196
Level 3 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 8,916,009 8,756,578
Acquired loans 91,904 105,701
Level 3 [Member] | Estimate Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 8,934,375 8,757,817
Acquired loans $ 91,904 $ 105,701