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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities held to maturity $ 909,643 $ 1,056,486
Net LHFI 8,756,578 8,493,234
Acquired loans 105,701 257,438
Deposits 11,364,411 10,577,512
Long-term FHLB advances 879 946
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 350,391 336,383
Securities held to maturity 909,643 1,056,486
Deposits 11,364,411 10,577,512
Short-term liabilities 129,477 1,440,876
Long-term FHLB advances 879 946
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 350,391 336,383
Securities held to maturity 889,733 1,046,247
Deposits 11,365,203 10,577,858
Short-term liabilities 129,477 1,440,876
Long-term FHLB advances 821 946
Junior subordinated debt securities 53,196 45,773
Level 3 [Member] | Carrying Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 8,756,578 8,493,234
Acquired loans 105,701 257,438
Level 3 [Member] | Estimate Fair Value [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net LHFI 8,757,817 8,507,469
Acquired loans $ 105,701 $ 257,438