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Investment Securities - Proceeds from Calls and Sales, Realized Gains and Losses and Interest Income (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Proceeds from calls and sales of investment securities      
Proceeds from calls of available for sale securities $ 63,000,000.0
Proceeds from sales of available for sale securities 1,000,000,000.0
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Gross realized gains on sales of investment securities 500,000 0 0
Gross realized losses on sales of investment securities 3,200,000 0 0
Income tax benefit related to net realized loss on sale of investment securities (700,000)
Interest income from taxable and nontaxable investment securities      
Taxable interest income 92,500,000 106,600,000 102,300,000
Non-taxable interest income $ 500,000 $ 100,000