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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 943,883 $ 1,056,486
Net LHFI 8,658,156 8,493,234
Acquired loans 130,901 257,438
Deposits 10,956,910 10,577,512
Long-term FHLB advances 896 946
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 433,471 336,383
Securities held to maturity 943,883 1,056,486
Deposits 10,956,910 10,577,512
Short-term liabilities 676,888 1,440,876
Long-term FHLB advances 896 946
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 433,471 336,383
Securities held to maturity 907,317 1,046,247
Deposits 10,953,348 10,577,858
Short-term liabilities 676,888 1,440,876
Long-term FHLB advances 831 946
Junior subordinated debt securities 53,815 45,773
Level 3 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 8,658,156 8,493,234
Acquired loans 130,901 257,438
Level 3 [Member] | Estimate Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 8,560,091 8,507,469
Acquired loans $ 130,901 $ 257,438