Estimated Fair Values (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers from level 2 to level 3	$ 0	$ 0		$ 1,800,000
Gains (Losses) from fair value changes on originated loans held for sale	400,000	$ 2,400,000	$ (2,300,000)	$ 3,600,000
Originated loans held for sale, 90 days or more past due	0		0		$ 0
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability measured at fair value on nonrecurring basis	$ 0		$ 0		$ 0
Discount Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent Loans, Measurement Input	0.05		0.05
OREO, measurement input	0.06		0.06
Discount Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent Loans, Measurement Input	0.10		0.10
OREO, measurement input	0.15		0.15
Discount Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent Loans, Measurement Input	0.0788		0.0788
OREO, measurement input	0.06		0.06