Fair Value Measurement and Fair Value of Financial Instruments (Details 4) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-sale		$ 22,703
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-sale		0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-sale		22,703
Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-sale		0
Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	$ 47,937	70,154
Non-PCI impaired loans | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	47,937	70,154
Non-PCI impaired loans | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	9,172	14,908
Non-PCI impaired loans | CRE | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | CRE | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | CRE | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	9,172	14,908
Non-PCI impaired loans | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	32,053	52,172
Non-PCI impaired loans | C&I | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | C&I | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | C&I | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	32,053	52,172
Non-PCI impaired loans | Residential
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	6,079	2,464
Non-PCI impaired loans | Residential | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | Residential | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | Residential | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	6,079	2,464
Non-PCI impaired loans | Consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	633	610
Non-PCI impaired loans | Consumer | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | Consumer | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	0	0
Non-PCI impaired loans | Consumer | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	633	610
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
OREO	1,789	345
OREO | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
OREO	0	0
OREO | Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
OREO	0	0
OREO | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
OREO	$ 1,789	$ 345