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Fair Value Measurements - Assets and Liabilities on a Recurring Basis (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Summary of assets measured at fair value on a recurring basis        
Carried at fair value $ 3,301,054,000 $ 3,021,832,000    
Loan servicing rights 64,701,000 71,013,000 $ 68,837,000 $ 63,841,000
Transfers between levels 0      
Measured on a Recurring Basis        
Summary of assets measured at fair value on a recurring basis        
Carried at fair value 3,301,054,000 3,021,832,000    
Loans held-for-sale 23,535,000 85,030,000    
Loan servicing rights 64,701,000 71,013,000    
Total derivatives 47,359,000 38,595,000    
Total assets measured at fair value on a recurring basis 3,436,649,000 3,216,470,000    
Total derivatives 49,498,000 32,379,000    
Total liabilities at fair value 49,498,000 32,379,000    
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 3,301,054,000 3,021,832,000    
Loans held-for-sale 23,535,000 85,030,000    
Loan servicing rights 0 0    
Total derivatives 47,359,000 38,595,000    
Total assets measured at fair value on a recurring basis 3,371,948,000 3,145,457,000    
Total derivatives 49,498,000 32,379,000    
Total liabilities at fair value 49,498,000 32,379,000    
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 64,701,000 71,013,000    
Total derivatives 0 0    
Total assets measured at fair value on a recurring basis 64,701,000 71,013,000    
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 39,398,000 26,680,000    
Total derivatives 40,672,000 27,664,000    
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 39,398,000 26,680,000    
Total derivatives 40,672,000 27,664,000    
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 653,000 719,000    
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 653,000 719,000    
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 1,758,000 1,049,000    
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 1,758,000 1,049,000    
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 881,000 718,000    
Total derivatives 881,000 718,000    
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 881,000 718,000    
Total derivatives 881,000 718,000    
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 5,322,000 10,148,000    
Total derivatives 7,292,000 3,278,000    
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    
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 5,322,000 10,148,000    
Total derivatives 7,292,000 3,278,000    
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    
Total derivatives 0 0    
Measured on a Recurring Basis | Government and government-sponsored enterprises        
Summary of assets measured at fair value on a recurring basis        
Carried at fair value 387,390,000 351,700,000    
Measured on a Recurring Basis | Government and government-sponsored enterprises | 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 enterprises | Significant Other Observable Inputs (Level 2)        
Summary of assets measured at fair value on a recurring basis        
Carried at fair value 387,390,000 351,700,000    
Measured on a Recurring Basis | Government and government-sponsored enterprises | 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 554,743,000 516,286,000    
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 554,743,000 516,286,000    
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 202,240,000 213,428,000    
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 202,240,000 213,428,000    
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 1,802,924,000 1,601,298,000    
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 1,802,924,000 1,601,298,000    
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 306,147,000 293,063,000    
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 306,147,000 293,063,000    
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 47,610,000 46,057,000    
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 47,610,000 46,057,000    
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