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Other Borrowings - Narrative (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]    
Maximum borrowing capacity, lines of credit $ 25,000,000  
Long-term line of credit 0 $ 0
Unused borrowing capacity on established lines with FHLB 1,000,000,000 1,000,000,000
Unencumbered residential and commercial real estate loan 554,300,000  
Overnight FHLB advances 647,075,000 587,742,000
Term advances from FHLB $ 425,000,000 $ 475,000,000
Weighted average interest rate (percent) 2.07% 1.53%
Term advances mature within one year $ 275,000,000  
Term advances maturing after one year 150,000,000  
Term advances mature in 2019 130,000,000  
Term advances mature in 2020 20,000,000  
Callable FHLB borrowings 0  
Term borrowing with a bank 4,000,000 $ 9,000,000
Subsidiaries    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity, lines of credit $ 98,000,000 $ 58,000,000