Fair Value of Financial Instruments (Financial Assets Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	$ 170,918	$ 184,205
Other real estate owned and foreclosed assets, net	14,594	19,608
Total nonrecurring fair value measurements	185,512	203,813
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	170,918	184,205
Total nonrecurring fair value measurements	170,918	184,205
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned and foreclosed assets, net	14,594	19,608
Total nonrecurring fair value measurements	$ 14,594	$ 19,608