Disclosures About Fair Value of Financial Instruments - Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Available-for-sale securities	$ 276,021	$ 187,565
Level 1 [Member]
Financial assets:
Available-for-sale securities	74,974	27,035
Level 2 [Member]
Financial assets:
Available-for-sale securities	201,047	160,530
Recurring [Member]
Financial assets:
Available-for-sale securities	276,021	187,565
Recurring [Member] | Interest Rate Swap
Financial assets:
Derivative asset	1,528	274
Financial Liabilities:
Derivative liability	1,612	287
Recurring [Member] | Interest Rate Cap
Financial assets:
Derivative asset	25
Financial Liabilities:
Derivative liability	25
Recurring [Member] | Level 1 [Member]
Financial assets:
Available-for-sale securities	74,974	27,035
Recurring [Member] | Level 2 [Member]
Financial assets:
Available-for-sale securities	201,047	160,530
Recurring [Member] | Level 2 [Member] | Interest Rate Swap
Financial assets:
Derivative asset	1,528	274
Financial Liabilities:
Derivative liability	1,612	$ 287
Recurring [Member] | Level 2 [Member] | Interest Rate Cap
Financial assets:
Derivative asset	25
Financial Liabilities:
Derivative liability	$ 25