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Investment (Held-to-Maturity) Securities (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Gross Amortized Cost |  | $ 216,062 | $ 245,531
Investment securities, Allowance for Credit Loss |  | (470) | (688)
Investments securities, Amortized Cost, Net of Allowance |  | 215,592 | 244,843
Investment Securities, Fair Value |  | 238,489 | 272,431
Investment Securities, Gross Unrealized Gain |  | 22,450 | 27,046
Investment Securities, Gross Unrealized Loss |  | $ (23) | $ (146)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 4 | 8
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 1,217 | $ 2,701
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 582 | 2,068
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 1,799 | 4,769
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 3 | 41
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 20 | 105
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 23 | 146
Fixed Maturity Securities [Member] |  |  |
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value |  | 23,860 |
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value |  | 106,035 |
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value |  | 72,476 |
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value |  | 6,279 |
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value |  | 208,650 |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, Less Than One Year, Fair Value |  | 24,270 |
Investment Securities, Debt Maturities, One to Five Years, Fair Value |  | 121,113 |
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 78,661 |
Investment Securities, Debt Maturities, Over Ten Years, Fair Value |  | 6,361 |
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value |  | $ 230,405 |
Investment Securities, Debt Maturities, Weighted Average Maturity | [1] | 4.61 |
Municipal securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Gross Amortized Cost |  | $ 207,393 | 229,245
Investment Securities, Fair Value |  | 229,149 | 255,270
Investment Securities, Gross Unrealized Gain |  | 21,778 | 26,169
Investment Securities, Gross Unrealized Loss |  | $ (22) | $ (144)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract] |  |  |
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 2 | 6
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | $ 942 | $ 2,451
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 582 | 2,043
Investment Securities, Continuous Unrealized Loss Position, Fair Value |  | 1,524 | 4,494
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |  |
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 2 | 40
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 20 | 104
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 22 | 144
Other debt securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Gross Amortized Cost |  | 1,257 | 7,373
Investment Securities, Fair Value |  | 1,256 | 7,371
Investment Securities, Gross Unrealized Gain |  | 0 | 0
Investment Securities, Gross Unrealized Loss |  | $ (1) | $ (2)
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 |  | $ 275 | $ 250
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0 | 25
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 Loss |  | 1 | 1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 | 1
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 1 | 2
Residential agency mortgage-backed securities [Member] |  |  |
Schedule of Investment (Held-to-Maturity) Securities [Line Items] |  |  |
Investment Securities, Gross Amortized Cost |  | 7,412 | 8,913
Investment Securities, Fair Value |  | 8,084 | 9,790
Investment Securities, Gross Unrealized Gain |  | 672 | 877
Investment Securities, Gross Unrealized Loss |  | 0 | $ 0
Investment Securities, Debt Maturities, Net Carrying Value [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value | [2] | 7,412 |
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] |  |  |
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | $ 8,084 |
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4 years 2 months 12 days |
[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 4.2 years based upon current prepayment assumptions.

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing after rolling tenth fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, 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 current statement of financial position date. For interim and annual periods when interim period is reported on rolling approach. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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