Fair Value Measurement and Fair Value of Financial Instruments (Fair Value Adjustments of Assets Measured on a Nonrecurring Basis) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans held-for-sale lower of cost or fair value adjustments
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	$ 0	$ 61,000	$ 5,600,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	(9,056,000)	(22,624,000)	(26,212,000)
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	(9,341,000)	(19,703,000)	(27,106,000)
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	270,000	(272,000)	1,084,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Commercial Lending | Construction and land
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	0	(147,000)	0
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	15,000	(11,000)	(224,000)
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	0	0	34,000
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans | Consumer Lending | Other consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	0	(2,491,000)	0
Fair Value, Measurements, Nonrecurring | OREO nonrecurring fair value losses
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	0	(1,000)	(23,000)
Fair Value, Measurements, Nonrecurring | Loans held-for-sale lower of cost or fair value adjustments
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustment of assets	$ 0	$ 0	$ (5,565,000)