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Securities (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale securities transferred to Held-to-Maturity $ 0 $ 179,763,000 $ 0
Unrealized after tax loss on available-for-sale securities transferred to the held-to-maturity portfolio   2,200,000  
Securities pledged as collateral to secure public funds and other deposits or securities sold under agreements to repurchase 1,100,000,000    
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement 126,400,000    
Available-for-sale securities sold 737,700,000    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (4,388,000) $ (1,665,000) $ (5,022,000)
Securities pledged as collateral      
Debt Securities, Available-for-sale [Line Items]      
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement $ 126,400,000