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Fair Value, Measurement on Recurring and Nonrecurring Basis (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Financial assets:
Allowance for impaired loan losses	$ 71,069	$ 71,069
Number of impaired loans | item	5
Impairment loss on real estate owned	$ 1,000	2,000	$ 3,200
Non-financial assets:
Real Estate Investment Property, Net	13,220	14,446
Real Estate Owned
Financial assets:
Impairment loss on real estate owned	1,000	2,000	$ 3,200
Non-financial assets:
Real Estate Investment Property, Net	13,220	14,446
Carrying Value
Financial assets:
Derivative financial instruments	1,435	6,113
Financial liabilities:
Derivative financial instruments	3,097	732
Fair Value
Financial assets:
Derivative financial instruments	1,435	6,113
Financial liabilities:
Derivative financial instruments	3,097	$ 732
Recurring basis | Carrying Value
Financial assets:
Derivative financial instruments	1,435
Financial liabilities:
Derivative financial instruments	3,097
Recurring basis | Fair Value
Financial assets:
Derivative financial instruments	1,435
Financial liabilities:
Derivative financial instruments	3,097
Nonrecurring basis | Carrying Value
Financial assets:
Impaired loans, net	59,657
Non-financial assets:
Real Estate Investment Property, Net	13,220
Nonrecurring basis | Fair Value
Financial assets:
Impaired loans, net	59,657
Non-financial assets:
Real Estate Investment Property, Net	13,220
Level 2 | Recurring basis
Financial assets:
Derivative financial instruments	369
Financial liabilities:
Derivative financial instruments	3,097
Level 3 | Recurring basis
Financial assets:
Derivative financial instruments	1,066
Level 3 | Nonrecurring basis
Financial assets:
Impaired loans, net	59,657
Non-financial assets:
Real Estate Investment Property, Net	$ 13,220

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