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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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Amount of investment in debt security measured at amortized cost (held-to-maturity) before allowance for credit losses

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The calculated weighted-average expected life of mortgage-backed securities held to maturity based on prepayment assumptions as of the balance sheet date.

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Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next 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.

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Fair value 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 latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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