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Restricted Cash Balances	12 Months Ended
Restricted Cash Balances	Dec. 31, 2017
Restricted Cash Balances [Abstract]
Restricted Cash Balances	NOTE 2. RESTRICTED CASH BALANCES The Company is required to maintain reserve balances with the FRBSF. Such reserve requirements are based on a percentage of deposit liabilities and may be satisfied by cash on hand. The average reserves required to be held at the FRBSF for the years ended December 31, 2017 and 2016 were $77.6 million and $67.7 million, respectively.