Fair Value Measurements (Financial Assets Measured at Fair Value on Nonrecurring Basis) (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	$ 163,781	$ 170,918
Other real estate owned and foreclosed assets, net	7,688	14,594
Total nonrecurring fair value measurements	171,469	185,512
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent impaired loans	163,781	170,918
Total nonrecurring fair value measurements	163,781	170,918
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned and foreclosed assets, net	7,688	14,594
Total nonrecurring fair value measurements	$ 7,688	$ 14,594