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Loans (Details) - Loan Portfolio - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans $ 10,232,159 $ 8,254,145
Deferred loan fees included in total loans 4,375 3,838
Overdrawn demand deposits included in total loans 7,946 7,836
Commercial, industrial, and agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans 3,844,172 3,217,154
Commercial, industrial, and agricultural | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,410,748 2,827,658
Total Loans 3,410,748 2,827,658
Commercial, industrial, and agricultural | Agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 433,424 389,496
Total Loans 433,424 389,496
Commercial real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,592,663 3,627,087
Total Loans 4,592,663 3,627,087
Commercial real estate loans | Office, retail, and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,983,802 1,581,967
Total Loans 1,983,802 1,581,967
Commercial real estate loans | Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 681,032 614,052
Total Loans 681,032 614,052
Commercial real estate loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 543,892 451,540
Total Loans 543,892 451,540
Commercial real estate loans | Other commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,383,937 979,528
Total Loans 1,383,937 979,528
Total corporate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 8,436,835 6,844,241
Total Loans 8,436,835 6,844,241
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,795,324 1,409,904
Total Loans 1,795,324 1,409,904
Consumer loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 865,656 747,983
Total Loans 865,656 747,983
Consumer loans | 1-4 family mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 614,818 423,922
Total Loans 614,818 423,922
Consumer loans | Installment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 314,850 237,999
Total Loans $ 314,850 $ 237,999