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Investment (Held-to-Maturity) Securities (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, fair value |  | $ 272,431 | $ 314,402
Investment Securities, Gross Unrealized Gain |  | 27,046 | 21,285
Investment Securities, Gross Unrealized Loss |  | (146) | (301)
Debt Securities, Held-to-maturity, gross |  | 245,531 |
Debt Securities, Held-to-maturity, Allowance for Credit Loss |  | 688 |
Investment securities |  | 244,843 | 293,418
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, fair value |  | $ 272,431 | $ 314,402
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 8 | 17
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 2,701 | $ 1,276
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 2,068 | 9,747
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 4,769 | 11,023
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses |  | 41 | 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses |  | 105 | 299
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 146 | 301
Fixed maturity securities [Member] |  |  |
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract] |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 31,029 |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 76,646 |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 119,966 |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 8,977 |
Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value |  | 236,618 |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, Less than One Year, Fair Value |  | 31,459 |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 83,944 |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 138,101 |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 9,137 |
Investment Securities, Debt Maturities, Single Maturity Date, Fair value |  | $ 262,641 |
Investment Securities, Debt Maturities, Weighted Average Maturity | [1] | 4.90 |
Municipal securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, fair value |  | $ 255,270 | 295,032
Investment Securities, Gross Unrealized Gain |  | 26,169 | 20,797
Investment Securities, Gross Unrealized Loss |  | (144) | (300)
Debt Securities, Held-to-maturity, gross |  | 229,245 | 274,535
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, fair value |  | $ 255,270 | $ 295,032
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 6 | 15
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 2,451 | $ 1,001
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 2,043 | 9,747
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 4,494 | 10,748
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses |  | 40 | 1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses |  | 104 | 299
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 144 | 300
Residential agency mortgage-backed securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, fair value |  | 9,790 | 11,164
Investment Securities, Gross Unrealized Gain |  | 877 | 488
Investment Securities, Gross Unrealized Loss |  | 0 | 0
Debt Securities, Held-to-maturity, gross |  | 8,913 | 10,676
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying value | [2] | 8,913 |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Fair value |  | 9,790 |
Investment Securities, fair value |  | $ 9,790 | 11,164
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4.0 years |
Other debt securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, fair value |  | $ 7,371 | 8,206
Investment Securities, Gross Unrealized Gain |  | 0 | 0
Investment Securities, Gross Unrealized Loss |  | (2) | (1)
Debt Securities, Held-to-maturity, gross |  | 7,373 | 8,207
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, fair value |  | $ 7,371 | $ 8,206
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 2 | 2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 250 | $ 275
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 25 | 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 275 | 275
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses |  | 1 | 1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses |  | 1 | 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ 2 | $ 1
[1] | Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[2] | The average expected lives of residential mortgage-backed securities were 4.0 years based upon current prepayment assumptions.

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in second through fifth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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