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Borrowings - Additional Information (Details)
Mar. 31, 2019
USD ($)
lease
Dec. 31, 2018
USD ($)
Long Term And Short Term Debt [Line Items]    
Number of capital leases | lease 2  
Total long-term debt outstanding at a fixed rate $ 6,100,000  
Total long-term debt outstanding at a variable rate 63,100,000  
Federal Home Loan Bank Advance    
Long Term And Short Term Debt [Line Items]    
Total borrowings 304,200,000 $ 540,300,000
Short-term borrowings 235,000,000  
Long-term borrowings 69,200,000  
Maximum borrowing capacity 2,600,000,000.0  
Borrowing capacity utilized 466,000,000  
Letter of credit to collateralize public funds 161,800,000  
Remaining borrowing capacity 2,100,000,000  
Mortgage Backed Securities    
Long Term And Short Term Debt [Line Items]    
Amortized cost of securities pledged as collateral 28,400,000 24,200,000
Carrying value of securities pledged as collateral $ 28,200,000 $ 23,900,000