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Loans - Loan Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 10,676,774 $ 10,437,812
Deferred loan fees included in total loans 5,349 4,986
Overdrawn demand deposits included in total loans 6,302 8,587
Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 4,094,800 3,960,800
Commercial and industrial | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 3,659,066 3,529,914
Total loans 3,659,066 3,529,914
Commercial and industrial | Agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 435,734 430,886
Total loans 435,734 430,886
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,576,036 4,553,618
Total loans 4,576,036 4,553,618
Commercial real estate | Office, retail, and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,931,202 1,979,820
Total loans 1,931,202 1,979,820
Commercial real estate | Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 695,830 675,463
Total loans 695,830 675,463
Commercial real estate | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 585,766 539,820
Total loans 585,766 539,820
Commercial real estate | Other commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,363,238 1,358,515
Total loans 1,363,238 1,358,515
Total corporate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 8,670,836 8,514,418
Total loans 8,670,836 8,514,418
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 2,005,938 1,923,394
Total loans 2,005,938 1,923,394
Consumer loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 881,534 827,055
Total loans 881,534 827,055
Consumer loans | 1-4 family mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 798,902 774,357
Total loans 798,902 774,357
Consumer loans | Installment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 325,502 321,982
Total loans $ 325,502 $ 321,982