Fair Value, Measurement on Recurring and Nonrecurring Basis (Details) $ in Thousands	Mar. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Financial assets:
Allowance for impaired loan losses	$ 63,108	$ 62,783
Number of impaired loans | item	5
Hotel
Financial assets:
Allowance for impaired loan losses	$ 5,700	5,700
Carrying Value
Financial assets:
Derivative financial instruments	2,763	684
Aggregate carrying value of impaired loans before loan loss reserves	163,900
Financial liabilities:
Derivative financial instruments	300	1,306
Fair Value
Financial assets:
Derivative financial instruments	2,763	684
Financial liabilities:
Derivative financial instruments	300	$ 1,306
Recurring basis | Carrying Value
Financial assets:
Derivative financial instruments	2,763
Financial liabilities:
Derivative financial instruments	300
Recurring basis | Fair Value
Financial assets:
Derivative financial instruments	2,763
Financial liabilities:
Derivative financial instruments	300
Nonrecurring basis | Carrying Value
Financial assets:
Impaired loans, net	100,798
Nonrecurring basis | Fair Value
Financial assets:
Impaired loans, net	100,798
Level 2 | Recurring basis
Financial assets:
Derivative financial instruments	2,046
Financial liabilities:
Derivative financial instruments	300
Level 3 | Recurring basis
Financial assets:
Derivative financial instruments	717
Level 3 | Nonrecurring basis
Financial assets:
Impaired loans, net	$ 100,798