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Disclosures about Fair Value of Assets and Liabilities - Quantitative Information about Unobservable Inputs (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Quantitative information about unobservable inputs        
Mortgage servicing rights $ 74,387 $ 77,844 $ 66,079 $ 53,670
Available for sale securities 290,243 331,071    
Mortgage servicing rights | Level 3        
Quantitative information about unobservable inputs        
Mortgage servicing rights 74,387 77,844    
Collateral-dependent impaired loans | Level 3        
Quantitative information about unobservable inputs        
Collateral-dependent impaired loans $ 1,570 $ 2,639    
Collateral-dependent impaired loans | Level 3 | Minimum        
Quantitative information about unobservable inputs        
Marketability discount (as a percent) 0.37 0.05    
Collateral-dependent impaired loans | Level 3 | Maximum        
Quantitative information about unobservable inputs        
Marketability discount (as a percent) 55 0.47    
Municipals        
Quantitative information about unobservable inputs        
Available for sale securities $ 5,937 $ 21,332    
Municipals | Level 3        
Quantitative information about unobservable inputs        
Available for sale securities     $ 6,700  
Discount Rate | Mortgage servicing rights | Level 3 | Minimum        
Quantitative information about unobservable inputs        
Servicing asset, measurement input 0.08 0.08    
Discount Rate | Mortgage servicing rights | Level 3 | Maximum        
Quantitative information about unobservable inputs        
Servicing asset, measurement input 0.13 0.13    
Constant Prepayment Rate | Mortgage servicing rights | Level 3 | Minimum        
Quantitative information about unobservable inputs        
Servicing asset, measurement input 0.01 0.01    
Constant Prepayment Rate | Mortgage servicing rights | Level 3 | Maximum        
Quantitative information about unobservable inputs        
Servicing asset, measurement input 0.39 0.36    
Interest Rate Lock Commitments | Level 3        
Quantitative information about unobservable inputs        
Derivative assets $ 186 $ 70    
Interest Rate Lock Commitments | Measurement Input, Maturity | Level 3 | Minimum        
Quantitative information about unobservable inputs        
Loan closing rates (as a percent) 0.73 0.95    
Interest Rate Lock Commitments | Measurement Input, Maturity | Level 3 | Maximum        
Quantitative information about unobservable inputs        
Loan closing rates (as a percent) 99 100