Fair Value of Financial Instruments (Narrative) (Details)
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3 Months Ended |
9 Months Ended |
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Sep. 30, 2020
USD ($)
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Sep. 30, 2019
USD ($)
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Sep. 30, 2020
USD ($)
security
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Sep. 30, 2019
USD ($)
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Jun. 30, 2020
USD ($)
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Mar. 31, 2020
USD ($)
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Jun. 30, 2019
USD ($)
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Mar. 31, 2019
USD ($)
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Gains or losses included in earnings attributable to the change in realized/unrealized gains or losses related to the assets |
$ 0
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$ 0
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$ 0
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$ 0
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| Fair value, assets, level 1 to level 2 transfers, amount |
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$ 0
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$ 0
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| Fair value, assets, level 2 to level 1 transfer, amount |
0
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$ 0
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$ 0
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$ 0
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$ 0
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$ 0
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| Collateralized debt obligations [Member] |
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Acquired trust preferred securities, number of securities | security |
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9
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| Collateralized debt obligations [Member] | Fair Value, Inputs, Level 3 [Member] |
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Trust preferred securities, amortized cost |
18,500,000
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$ 18,500,000
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| Trust preferred securities, fair value |
$ 12,800,000
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$ 12,800,000
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