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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Held to maturity investment securities $ 611,419  
Available for sale investment securities 2,080,294 $ 2,547,956
FHLB advances and long-term debt (5) 992,279 1,038,346
Book Value    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 103,436 108,291
Interest-bearing deposits with other banks 342,251 293,805
FRB and FHLB stock 79,283 60,761
Loans held for sale 27,099 31,530
Held to maturity investment securities 606,679 0
Available for sale investment securities 2,115,265 2,547,956
Net Loans 16,005,263 15,598,337
Other financial assets 58,879 52,910
Derivative assets 235,782 215,464
Demand and Savings Deposit Liabilities, Fair Value Disclosure 13,478,016 13,042,147
Brokered Deposit Liabilities, Fair Value Disclosure 176,239 90,473
Time Deposit Liabilities, Fair Value Disclosure 2,721,904 2,664,912
Accrued interest payable 754,777 617,524
Other financial liabilities 10,529 9,317
Other financial liabilities 218,061 227,569
FHLB advances and long-term debt (5) 992,279 1,038,346
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 103,436 108,291
Interest-bearing deposits with other banks 342,251 293,805
FRB and FHLB stock 79,283 60,761
Loans held for sale 27,099 31,530
Held to maturity investment securities 611,419 0
Available for sale investment securities 2,080,294 2,547,956
Net Loans 15,446,895 15,380,974
Other financial assets 58,879 52,910
Derivative assets 235,782 215,464
Demand and Savings Deposit Liabilities, Fair Value Disclosure 13,478,016 13,042,147
Brokered Deposit Liabilities, Fair Value Disclosure 176,239 90,473
Time Deposit Liabilities, Fair Value Disclosure 2,712,296 2,673,359
Accrued interest payable 754,777 617,524
Other financial liabilities 10,529 9,317
Other financial liabilities 218,061 227,569
FHLB advances and long-term debt (5) 970,985 1,025,640
Level 1 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 103,436 108,291
Interest-bearing deposits with other banks 342,251 293,805
FRB and FHLB stock 0 0
Loans held for sale 0 0
Held to maturity investment securities 611,419 0
Available for sale investment securities 0 918
Net Loans 0 0
Other financial assets 58,879 52,910
Derivative assets 124,138 123,439
Demand and Savings Deposit Liabilities, Fair Value Disclosure 13,478,016 13,042,147
Brokered Deposit Liabilities, Fair Value Disclosure 176,239 90,473
Time Deposit Liabilities, Fair Value Disclosure 0 0
Accrued interest payable 754,777 617,524
Other financial liabilities 10,529 9,317
Other financial liabilities 161,003 182,381
FHLB advances and long-term debt (5) 0 0
Level 2 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 0 0
Interest-bearing deposits with other banks 0 0
FRB and FHLB stock 79,283 60,761
Loans held for sale 27,099 31,530
Held to maturity investment securities 0 0
Available for sale investment securities 1,974,025 2,444,613
Net Loans 0 0
Other financial assets 0 0
Derivative assets 62,552 44,539
Demand and Savings Deposit Liabilities, Fair Value Disclosure 0 0
Brokered Deposit Liabilities, Fair Value Disclosure 0 0
Time Deposit Liabilities, Fair Value Disclosure 2,712,296 2,673,359
Accrued interest payable 0 0
Other financial liabilities 0 0
Other financial liabilities 48,185 39,014
FHLB advances and long-term debt (5) 970,985 1,025,640
Level 3 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 0 0
Interest-bearing deposits with other banks 0 0
FRB and FHLB stock 0 0
Loans held for sale 0 0
Held to maturity investment securities 0 0
Available for sale investment securities 106,269 102,425
Net Loans 15,446,895 15,380,974
Other financial assets 0 0
Derivative assets 49,092 47,486
Demand and Savings Deposit Liabilities, Fair Value Disclosure 0 0
Brokered Deposit Liabilities, Fair Value Disclosure 0 0
Time Deposit Liabilities, Fair Value Disclosure 0 0
Accrued interest payable 0 0
Other financial liabilities 0 0
Other financial liabilities 8,873 6,174
FHLB advances and long-term debt (5) $ 0 $ 0