Disclosures About Fair Value of Financial Instruments - Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financial assets:
Available-for-sale securities	$ 262,816	$ 276,021
Level 1 [Member]
Financial assets:
Available-for-sale securities	75,047	74,974
Level 2 [Member]
Financial assets:
Available-for-sale securities	187,769	201,047
Recurring [Member]
Financial assets:
Available-for-sale securities	262,816	276,021
Recurring [Member] | Interest Rate Swap
Financial assets:
Derivative asset	3,152	1,528
Financial Liabilities:
Derivative liability	3,321	1,612
Recurring [Member] | Interest Rate Cap
Financial assets:
Derivative asset	7	25
Financial Liabilities:
Derivative liability	7	25
Recurring [Member] | Level 1 [Member]
Financial assets:
Available-for-sale securities	75,047	74,974
Recurring [Member] | Level 2 [Member]
Financial assets:
Available-for-sale securities	187,769	201,047
Recurring [Member] | Level 2 [Member] | Interest Rate Swap
Financial assets:
Derivative asset	3,152	1,528
Financial Liabilities:
Derivative liability	3,321	1,612
Recurring [Member] | Level 2 [Member] | Interest Rate Cap
Financial assets:
Derivative asset	7	25
Financial Liabilities:
Derivative liability	$ 7	$ 25