Fair Value of Assets and Liabilities (Summary of Assets Measured at Fair Value on a Nonrecurring Basis) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 90,516	$ 101,255
Impaired loans, fair value losses (gains) recognized	14,813
Real estate acquired through oreclosure fair value losses recognized	5,774
Fair value losses (gains) recognized	20,587
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	64,184
Other real estate owned	45,584
Fair value of assets measured on nonrecurring basis	109,768
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0
Other real estate owned	0
Fair value of assets measured on nonrecurring basis	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0
Other real estate owned	0
Fair value of assets measured on nonrecurring basis	0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	64,184
Other real estate owned	45,584
Fair value of assets measured on nonrecurring basis	$ 109,768