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Loans - Loan Portfolio (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 11,446,783 $ 10,437,812
Deferred loan fees included in total loans 6,715 4,986
Overdrawn demand deposits included in total loans 8,583 8,587
Commercial, industrial, and agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 4,551,221 3,960,800
Commercial, industrial, and agricultural | Commercial and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,120,293 3,529,914
Total loans 4,120,293 3,529,914
Commercial, industrial, and agricultural | Agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 430,928 430,886
Total loans 430,928 430,886
Commercial real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 4,596,249 4,553,618
Total loans 4,596,249 4,553,618
Commercial real estate loans | Office, retail, and industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,820,917 1,979,820
Total loans 1,820,917 1,979,820
Commercial real estate loans | Multi-family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 764,185 675,463
Total loans 764,185 675,463
Commercial real estate loans | Construction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 649,337 539,820
Total loans 649,337 539,820
Commercial real estate loans | Other commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,361,810 1,358,515
Total loans 1,361,810 1,358,515
Total corporate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 9,147,470 8,514,418
Total loans 9,147,470 8,514,418
Consumer loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 2,299,313 1,923,394
Total loans 2,299,313 1,923,394
Consumer loans | Home equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 851,607 827,055
Total loans 851,607 827,055
Consumer loans | 1-4 family mortgages    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 1,017,181 774,357
Total loans 1,017,181 774,357
Consumer loans | Installment    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans 430,525 321,982
Total loans $ 430,525 $ 321,982