Fair Value Measurement and Fair Value of Financial Instruments (Details 3) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Loans held-for-sale
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	$ (8,000)	$ 0	$ 61,000	$ 2,400,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	(13,873,000)	(4,960,000)	(11,371,000)	(7,200,000)
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	193,000	(261,000)	(29,000)	1,908,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	(14,060,000)	(4,693,000)	(11,418,000)	(9,149,000)
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Residential
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	(30,000)	(4,000)	51,000	27,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	24,000	(2,000)	25,000	14,000
Fair Value, Measurements, Nonrecurring | OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	0	(1,073,000)	(285,000)	(1,529,000)
Fair Value, Measurements, Nonrecurring | Loans held-for-sale
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	$ 0	$ 0	$ 0	$ (2,351,000)