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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.