Fair Value of Financial Instruments (Financial Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	$ 169,888	$ 93,602
Other real estate owned	13,968	17,206
Total nonrecurring fair value measurements	183,856	110,808
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	169,888	93,602
Total nonrecurring fair value measurements	169,888	93,602
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	13,968	17,206
Total nonrecurring fair value measurements	$ 13,968	$ 17,206