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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Available for sale investment securities $ 2,508,068 $ 2,484,773
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 86,497 101,120
Interest-bearing deposits with other banks 368,031 230,300
Federal Reserve Bank and Federal Home Loan Bank stock 60,935 62,216
Loans held for sale 27,836 16,886
Available for sale investment securities 2,508,068 2,484,773
Net Loans 14,228,712 13,669,548
Accrued interest receivable 43,600 42,767
Other financial assets 227,310 166,920
Demand and savings deposits 12,148,162 11,267,367
Time deposits 2,804,317 2,864,950
Short-term borrowings 264,042 497,663
Accrued interest payable 13,645 10,724
Other financial liabilities 263,489 190,927
Federal Home Loan Bank advances and long-term debt 965,286 949,542
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 86,497 101,120
Interest-bearing deposits with other banks 368,031 230,300
Federal Reserve Bank and Federal Home Loan Bank stock 60,935 62,216
Loans held for sale 27,836 16,886
Available for sale investment securities 2,508,068 2,484,773
Net Loans 14,155,453 13,540,903
Accrued interest receivable 43,600 42,767
Other financial assets 227,310 166,920
Demand and savings deposits 12,148,162 11,267,367
Time deposits 2,824,653 2,862,868
Short-term borrowings 264,042 497,663
Accrued interest payable 13,645 10,724
Other financial liabilities 263,489 190,927
Federal Home Loan Bank advances and long-term debt $ 986,323 $ 959,315