Commitments and Contingent Liabilities - Contingencies (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) item
Overdraft fee litigation
Contingencies
Loss contingency liability | $	$ 0
First Hawaiian Bank
Contingencies
Number of times a continuous negative balance overdraft fee charges on accounts remaining in negative balance for a seven-day period | item	1
Period for one-time continuous negative balance overdraft fee	7 days