Investment Securities (Non-Cash OTTI Credit Losses Recognized in Earnings) (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Investment Securities [Abstract] | ||
| Balance of credit-related OTTI, Beginning | $ 2,646 | $ 2,958 |
| Reduction for increases in cash flows expected to be collected | (200) | (312) |
| Balance of credit-related OTTI, Ending | $ 2,446 | $ 2,646 |