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Fair Value Measurements Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Equity securities, value test coverage 80.00%  
Fair value price difference threshold 5.00%  
Estimated Fair Value $ 2,547,038  
Other real estate owned (OREO) $ 9,823 $ 12,815
Assumed market return to liquidity 5 years  
Corporate debt securities    
Estimated Fair Value $ 97,309 109,409
Single-issuer trust preferred securities    
Estimated Fair Value 30,703 39,829
Pooled trust preferred securities    
Estimated Fair Value 707 422
Level 3 | Other Assets    
Other real estate owned (OREO) 9,800 12,800
Net MSRs at end of year 37,700 37,500
Fair Value, Measurements, Recurring    
Other financial assets 63,990 61,592
Other financial liabilities 58,371 58,766
Fair Value, Measurements, Recurring | Single-issuer trust preferred securities    
Estimated Fair Value 30,700 39,800
Fair Value, Measurements, Recurring | Level 1    
Other financial assets 19,451 17,111
Other financial liabilities 19,357 17,032
Fair Value, Measurements, Recurring | Level 1 | Equity Securities Financial Institution    
Available-for-sale securities, equity securities 0 23,500
Fair Value, Measurements, Recurring | Level 1 | Equity Securities, Miscellaneous    
Available-for-sale securities, equity securities 911 1,000
Fair Value, Measurements, Recurring | Level 2    
Other financial assets 44,539 44,481
Other financial liabilities 39,014 41,734
Fair Value, Measurements, Recurring | Level 2 | Financial Institutions Subordinated Debt    
Estimated Fair Value 61,900 65,200
Fair Value, Measurements, Recurring | Level 2 | Single-issuer trust preferred securities    
Estimated Fair Value 27,700 37,300
Fair Value, Measurements, Recurring | Level 2 | Other Corporate Debt    
Estimated Fair Value 4,000 4,000
Fair Value, Measurements, Recurring | Level 3    
Other financial assets 0 0
Other financial liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Single-issuer trust preferred securities    
Estimated Fair Value 3,100 2,500
Fair Value, Measurements, Recurring | Level 3 | Pooled trust preferred securities    
Estimated Fair Value $ 707 400
Minimum    
Assumptions used to estimate fair value, prepayment speed 11.70%  
Assumptions used to estimate fair value, discount rate 9.50%  
Trust for Benefit of Employees | Fair Value, Measurements, Recurring | Level 1    
Other financial assets $ 19,000 16,400
Foreign Exchange Contract | Fair Value, Measurements, Recurring | Level 1    
Other financial assets 460 700
Forward Commitments | Fair Value, Measurements, Recurring | Level 2    
Other financial assets 1,100 3,100
Other financial liabilities 272 300
Interest Rate Swap | Fair Value, Measurements, Recurring | Level 2    
Other financial assets 43,400 41,400
Other financial liabilities 38,700 41,400
Foreign Exchange Contract | Fair Value, Measurements, Recurring | Level 1    
Other financial liabilities 374 700
Trust for Benefit of Employees | Fair Value, Measurements, Recurring | Level 1    
Other financial liabilities $ 19,000 $ 16,400