Deposits - Maturities on Outstanding Time Deposits of $100 thousand or More (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Maturities of time deposits of $ 100 thousand or more [Abstract]
3 months or less	$ 203,679	$ 150,991
Over 3 months through 6 months	183,679	147,089
Over 6 months through 12 months	276,944	204,944
Over 12 months	179,237	179,469
Total	$ 843,539	$ 682,493

No definition available.

Name:	us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations of $100,000 or more, maturing after twelve months from the balance sheet date.

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