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Fair Value, Measurement on Recurring and Nonrecurring Basis (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) item	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Financial assets:
Allowance for impaired loan losses	$ 60,951	$ 60,951		$ 62,783
Number of impaired loans | item	5	5
Non-financial assets:
Long-lived assets	$ 14,563	$ 14,563		16,787
Impairment loss on real estate owned		2,000	$ 2,700
Real Estate Owned
Non-financial assets:
Long-lived assets	14,563	14,563		16,787
Office
Financial assets:
Allowance for impaired loan losses	1,500	1,500		1,500
Office | Real Estate Owned
Non-financial assets:
Long-lived assets	3,210	3,210		5,329
Impairment loss on real estate owned	2,000	2,000
Carrying Value
Financial assets:
Derivative financial instruments	926	926		684
Aggregate carrying value of impaired loans before loan loss reserves	131,900	131,900
Financial liabilities:
Derivative financial instruments	3,406	3,406		1,306
Fair Value
Financial assets:
Derivative financial instruments	926	926		684
Financial liabilities:
Derivative financial instruments	3,406	3,406		$ 1,306
Recurring basis | Carrying Value
Financial assets:
Derivative financial instruments	926	926
Financial liabilities:
Derivative financial instruments	3,406	3,406
Recurring basis | Fair Value
Financial assets:
Derivative financial instruments	926	926
Financial liabilities:
Derivative financial instruments	3,406	3,406
Nonrecurring basis | Carrying Value
Financial assets:
Impaired loans, net	70,909	70,909
Non-financial assets:
Long-lived assets	14,563	14,563
Nonrecurring basis | Fair Value
Financial assets:
Impaired loans, net	70,909	70,909
Non-financial assets:
Long-lived assets	14,563	14,563
Level 2 | Recurring basis
Financial assets:
Derivative financial instruments	177	177
Financial liabilities:
Derivative financial instruments	3,406	3,406
Level 3 | Recurring basis
Financial assets:
Derivative financial instruments	749	749
Level 3 | Nonrecurring basis
Financial assets:
Impaired loans, net	70,909	70,909
Non-financial assets:
Long-lived assets	$ 14,563	$ 14,563

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