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Fair Value Measurements - Assets on a Recurring Basis (Details) - USD ($)
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0          
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 2,736,880,000   $ 1,963,546,000      
Loan servicing rights 72,707,000 $ 70,364,000 63,841,000 $ 62,195,000 $ 64,522,000 $ 48,085,000
Measured on a Recurring Basis            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 2,736,880,000   1,963,546,000      
Loans held-for-sale 93,736,000   52,133,000      
Loan servicing rights 72,707,000   63,841,000      
Total derivatives 45,561,000   18,681,000      
Total assets measured at fair value on a recurring basis 2,948,884,000   2,098,201,000      
Total derivatives 22,966,000   12,357,000      
Total liabilities at fair value 22,966,000   12,357,000      
Measured on a Recurring Basis | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Loans held-for-sale 0   0      
Loan servicing rights 0   0      
Total derivatives 0   0      
Total assets measured at fair value on a recurring basis 0   0      
Total derivatives 0   0      
Total liabilities at fair value 0   0      
Measured on a Recurring Basis | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 2,736,880,000   1,963,546,000      
Loans held-for-sale 93,736,000   52,133,000      
Loan servicing rights 0   0      
Total derivatives 45,561,000   18,681,000      
Total assets measured at fair value on a recurring basis 2,876,177,000   2,034,360,000      
Total derivatives 22,966,000   12,357,000      
Total liabilities at fair value 22,966,000   12,357,000      
Measured on a Recurring Basis | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Loans held-for-sale 0   0      
Loan servicing rights 72,707,000   63,841,000      
Total derivatives 0   0      
Total assets measured at fair value on a recurring basis 72,707,000   63,841,000      
Total derivatives 0   0      
Total liabilities at fair value 0   0      
Measured on a Recurring Basis | Customer-initiated derivatives            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 21,390,000   9,376,000      
Total derivatives 21,703,000   10,139,000      
Measured on a Recurring Basis | Customer-initiated derivatives | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0   0      
Total derivatives 0   0      
Measured on a Recurring Basis | Customer-initiated derivatives | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 21,390,000   9,376,000      
Total derivatives 21,703,000   10,139,000      
Measured on a Recurring Basis | Customer-initiated derivatives | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0   0      
Total derivatives 0   0      
Measured on a Recurring Basis | Foreign exchange forwards            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 3,000          
Total derivatives 3,000          
Measured on a Recurring Basis | Foreign exchange forwards | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0          
Total derivatives 0          
Measured on a Recurring Basis | Foreign exchange forwards | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 3,000          
Total derivatives 3,000          
Measured on a Recurring Basis | Foreign exchange forwards | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0          
Total derivatives 0          
Measured on a Recurring Basis | Forward contracts related to mortgage loans to be delivered for sale            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 760,000          
Total derivatives     34,000      
Measured on a Recurring Basis | Forward contracts related to mortgage loans to be delivered for sale | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0          
Total derivatives     0      
Measured on a Recurring Basis | Forward contracts related to mortgage loans to be delivered for sale | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 760,000          
Total derivatives     34,000      
Measured on a Recurring Basis | Forward contracts related to mortgage loans to be delivered for sale | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0          
Total derivatives     0      
Measured on a Recurring Basis | Interest rate lock commitments            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 1,081,000   1,222,000      
Measured on a Recurring Basis | Interest rate lock commitments | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0   0      
Measured on a Recurring Basis | Interest rate lock commitments | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 1,081,000   1,222,000      
Measured on a Recurring Basis | Interest rate lock commitments | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0   0      
Measured on a Recurring Basis | Power Equity CD            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 1,260,000   2,184,000      
Total derivatives 1,260,000   2,184,000      
Measured on a Recurring Basis | Power Equity CD | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0   0      
Total derivatives 0   0      
Measured on a Recurring Basis | Power Equity CD | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 1,260,000   2,184,000      
Total derivatives 1,260,000   2,184,000      
Measured on a Recurring Basis | Power Equity CD | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0   0      
Total derivatives 0   0      
Measured on a Recurring Basis | Risk management derivatives            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 21,067,000   5,899,000      
Measured on a Recurring Basis | Risk management derivatives | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0   0      
Measured on a Recurring Basis | Risk management derivatives | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 21,067,000   5,899,000      
Measured on a Recurring Basis | Risk management derivatives | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 0   0      
Measured on a Recurring Basis | Government and government-sponsored agencies            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 254,453,000   202,916,000      
Measured on a Recurring Basis | Government and government-sponsored agencies | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Government and government-sponsored agencies | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 254,453,000   202,916,000      
Measured on a Recurring Basis | Government and government-sponsored agencies | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | State and political subdivisions            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 491,909,000   345,970,000      
Measured on a Recurring Basis | State and political subdivisions | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | State and political subdivisions | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 491,909,000   345,970,000      
Measured on a Recurring Basis | State and political subdivisions | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Residential mortgage-backed securities            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 177,021,000   150,131,000      
Measured on a Recurring Basis | Residential mortgage-backed securities | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Residential mortgage-backed securities | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 177,021,000   150,131,000      
Measured on a Recurring Basis | Residential mortgage-backed securities | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Collateralized mortgage obligations            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 1,477,818,000   1,033,845,000      
Measured on a Recurring Basis | Collateralized mortgage obligations | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Collateralized mortgage obligations | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 1,477,818,000   1,033,845,000      
Measured on a Recurring Basis | Collateralized mortgage obligations | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Corporate bonds            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 287,405,000   192,794,000      
Measured on a Recurring Basis | Corporate bonds | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Corporate bonds | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 287,405,000   192,794,000      
Measured on a Recurring Basis | Corporate bonds | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Trust preferred securities            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 48,274,000   36,066,000      
Measured on a Recurring Basis | Trust preferred securities | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 0   0      
Measured on a Recurring Basis | Trust preferred securities | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 48,274,000   36,066,000      
Measured on a Recurring Basis | Trust preferred securities | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value $ 0   0      
Measured on a Recurring Basis | Preferred stock            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value     1,824,000      
Measured on a Recurring Basis | Preferred stock | Quoted Prices In Active Markets for Identical Assets (Level 1)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value     0      
Measured on a Recurring Basis | Preferred stock | Significant Other Observable Inputs (Level 2)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value     1,824,000      
Measured on a Recurring Basis | Preferred stock | Significant Unobservable Inputs (Level 3)            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value     $ 0