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Fair Value Measurements - Assets on a Recurring Basis (Details) - USD ($)
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 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 2,529,910,000   $ 1,963,546,000      
Loan servicing rights 70,364,000 $ 68,837,000 63,841,000 $ 64,522,000 $ 64,604,000 $ 48,085,000
Measured on a Recurring Basis            
Summary of assets measured at fair value on a recurring basis            
Carried at fair value 2,529,910,000   1,963,546,000      
Loans held-for-sale 46,849,000   52,133,000      
Loan servicing rights 70,364,000   63,841,000      
Total derivatives 39,188,000   18,681,000      
Total assets measured at fair value on a recurring basis 2,686,311,000   2,098,201,000      
Total derivatives 20,407,000   12,357,000      
Total liabilities at fair value 20,407,000   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 2,529,910,000   1,963,546,000      
Loans held-for-sale 46,849,000   52,133,000      
Loan servicing rights 0   0      
Total derivatives 39,188,000   18,681,000      
Total assets measured at fair value on a recurring basis 2,615,947,000   2,034,360,000      
Total derivatives 20,407,000   12,357,000      
Total liabilities at fair value 20,407,000   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 70,364,000   63,841,000      
Total derivatives 0   0      
Total assets measured at fair value on a recurring basis 70,364,000   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 18,275,000   9,376,000      
Total derivatives 18,672,000   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 18,275,000   9,376,000      
Total derivatives 18,672,000   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 | Forward contracts related to mortgage loans to be delivered for sale            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 425,000   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   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 425,000   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   0      
Measured on a Recurring Basis | Interest rate lock commitments            
Summary of assets measured at fair value on a recurring basis            
Total derivatives 1,985,000   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 1,985,000   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 1,310,000   2,184,000      
Total derivatives 1,310,000   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 1,310,000   2,184,000      
Total derivatives 1,310,000   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 17,618,000   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 17,618,000   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 235,083,000   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 235,083,000   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 445,080,000   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 445,080,000   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 179,794,000   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 179,794,000   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 1,384,232,000   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 1,384,232,000   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 249,536,000   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 249,536,000   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 36,185,000   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 36,185,000   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