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Investment Securities - Proceeds from Calls and Sales, Realized Gains and Losses and Interest Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Proceeds from calls and sales of investment securities    
Proceeds from calls of available for sale securities $ 0 $ 0
Proceeds from sales of available for sale securities 863,100 0
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]    
Gross realized gains on sales of investment securities 0 0
Gross realized losses on sales of investment securities 2,600 0
Income tax benefit related to net realized loss on sale of investment securities 700 0
Interest income from taxable and nontaxable investment securities    
Taxable interest income 24,500 28,900
Non-taxable interest income $ 0 $ 100