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Transactions with Executive Officers, Directors and Principal Stockholders (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Leases [Abstract] |  |
Proceeds from Other Deposits | $ 42,400 | $ 47,700

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash inflow for receipts of deposits classified as other. + References No definition available. + Details
Name: | us-gaap_ProceedsFromOtherDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration