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Derivative Instruments (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |
Net gains or losses recognized in earnings related to yield maintenance provisions and interest-rate swaps | $ 0 | $ 0
Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional amount | 46,474,000 | 12,039,000
Interest-rate swaps | 2,392,000 |
Posted cash collateral | 2,392,000 |
Interest Rate Lock Commitments [Member] |  |
Derivative [Line Items] |  |
Notional amount | 1,048,613,000 | 297,454,000
Fair value, Derivative assets | $ 18,100,000 | 3,104,000
Interest Rate Lock Commitments [Member] | Minimum [Member] |  |
Derivative [Line Items] |  |
Commitments period | 30 days |
Interest Rate Lock Commitments [Member] | Maximum [Member] |  |
Derivative [Line Items] |  |
Commitments period | 60 days |
TBA Mortgage-Back Securities [Member] |  |
Derivative [Line Items] |  |
Posted cash collateral | $ 4,847,000 |
Notional amount | 506,750,000 | 225,500,000
Fair value | $ (2,690,000) | $ (350,000)

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