Deposits - Time deposit maturities of $100,000 and $250,000 or more (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amount $250,000 or more
Three months or less	$ 571,535
Over three months through six months	332,352
Over six months through twelve months	774,224
Over twelve months	95,319
Time deposits	$ 1,773,430	$ 1,280,000

Contractual Maturities, Time Deposits, $250,000 or More [Abstract]

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Contractual Maturities, Time Deposits, $250,000 or More, Six Months Through 12 Months

No definition available.

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Contractual Maturities, Time Deposits, $250,000 or More, Three Months Through Six Months

No definition available.

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Contractual Maturities, Time Deposits, $250,000 or More, Three Months or Less

No definition available.

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Contractual Maturities, Time Deposits, $250,000 or More, after 12 Months

No definition available.

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Time Deposits, $250,000 or More

No definition available.