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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 221,325 $ 245,531
Investment securities, Allowance for Credit Loss (493) (688)
Investments securities, Amortized Cost, Net of Allowance 220,832 244,843
Investment Securities, Fair Value 246,034 272,431
Investment Securities, Gross Unrealized Gain 24,724 27,046
Investment Securities, Gross Unrealized Loss $ (15) $ (146)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 3 8
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 275 $ 2,701
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 587 2,068
Investment Securities, Continuous Unrealized Loss Position, Fair Value 862 4,769
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 41
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 14 105
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 15 146
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 24,344  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 106,071  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 76,287  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 6,760  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 213,462  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 24,881  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 122,166  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 83,482  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 6,904  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 237,433  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 4.81  
Municipal securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 211,725 229,245
Investment Securities, Fair Value 235,697 255,270
Investment Securities, Gross Unrealized Gain 23,986 26,169
Investment Securities, Gross Unrealized Loss $ (14) $ (144)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1 6
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 2,451
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 587 2,043
Investment Securities, Continuous Unrealized Loss Position, Fair Value 587 4,494
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 40
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 14 104
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 14 144
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 1,737 7,373
Investment Securities, Fair Value 1,736 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 7,863 8,913
Investment Securities, Fair Value 8,601 9,790
Investment Securities, Gross Unrealized Gain 738 877
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] 7,863  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 8,601  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4.3 years  
[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 4.3 years based upon current prepayment assumptions.