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Investment Securities - Held-To-Maturity Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Held-to-maturity Securities    
Amortized Cost $ 622,519 $ 624,099
Unrealized Gains 7,392 2,548
Unrealized Losses 2,296 7,975
Held-to-maturity, fair value 627,615 618,672
State and political subdivisions    
Held-to-maturity Securities    
Amortized Cost 622,019 623,599
Unrealized Gains 7,392 2,548
Unrealized Losses 2,246 7,915
Held-to-maturity, fair value 627,165 618,232
Trust preferred securities    
Held-to-maturity Securities    
Amortized Cost 500 500
Unrealized Gains 0 0
Unrealized Losses 50 60
Held-to-maturity, fair value $ 450 $ 440