Fair Value Measurement and Fair Value of Financial Instruments (Carrying Amounts of Assets That Were Still Held and Had Fair Value Changes Measured on a Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	$ 49,679	$ 32,858
Non-PCI impaired loans | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	48,307	30,307
Non-PCI impaired loans | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	47,554	26,873
Non-PCI impaired loans | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	753	3,434
Non-PCI impaired loans | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	1,372	2,551
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans		2,551
Non-PCI impaired loans | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	1,372
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	125
Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	3,076
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	0
Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0	0
Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans		0
Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	0
Significant Other Observable Inputs (Level 2) | OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	0
Significant Other Observable Inputs (Level 2) | Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	0
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	49,679	32,858
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	48,307	30,307
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	47,554	26,873
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	753	3,434
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	1,372	2,551
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans		$ 2,551
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI Impaired loans	1,372
Significant Unobservable Inputs (Level 3) | OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	125
Significant Unobservable Inputs (Level 3) | Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	$ 3,076