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, 2020	Dec. 31, 2019
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	$ 189,862	$ 49,679
Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	186,225	48,307
Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	143,331	47,554
Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	42,894	753
Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	3,637	1,372
Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	1,146	1,372
Consumer Lending | Other consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	2,491
Investments in tax credit and other investments, net
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	3,140	3,076
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	15,824	125
Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		1,167
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Consumer Lending | Other consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	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	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	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	0	0
Significant Other Observable Inputs (Level 2) | Consumer Lending | Other consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	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	0
Significant Other Observable Inputs (Level 2) | OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	0	0
Significant Other Observable Inputs (Level 2) | Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	189,862	49,679
Significant Unobservable Inputs (Level 3) | Commercial Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	186,225	48,307
Significant Unobservable Inputs (Level 3) | Commercial Lending | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	143,331	47,554
Significant Unobservable Inputs (Level 3) | Commercial Lending | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	42,894	753
Significant Unobservable Inputs (Level 3) | Consumer Lending
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	3,637	1,372
Significant Unobservable Inputs (Level 3) | Consumer Lending | HELOCs
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	1,146	1,372
Significant Unobservable Inputs (Level 3) | Consumer Lending | Other consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-investment, Fair Value	2,491
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	3,140	3,076
Significant Unobservable Inputs (Level 3) | OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure	$ 15,824	125
Significant Unobservable Inputs (Level 3) | Other nonperforming assets
Fair Value, Assets Measured on a Nonrecurring Basis
Assets, fair value disclosure		$ 1,167