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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 226,738 $ 245,531
Investment securities, Allowance for Credit Loss (617) (688)
Investments securities, Amortized Cost, Net of Allowance 226,121 244,843
Investment Securities, Fair Value 252,707 272,431
Investment Securities, Gross Unrealized Gain 26,134 27,046
Investment Securities, Gross Unrealized Loss $ (165) $ (146)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 7 8
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,465 $ 2,701
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,035 2,068
Investment Securities, Continuous Unrealized Loss Position, Fair Value 4,500 4,769
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 52 41
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 113 105
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 165 146
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 27,143  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 76,456  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 106,311  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 8,351  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 218,261  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 27,866  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 85,490  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 121,763  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 8,372  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 243,491  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 4.95  
Municipal securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 216,047 229,245
Investment Securities, Fair Value 241,278 255,270
Investment Securities, Gross Unrealized Gain 25,395 26,169
Investment Securities, Gross Unrealized Loss $ (164) $ (144)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 6 6
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,440 $ 2,451
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,035 2,043
Investment Securities, Continuous Unrealized Loss Position, Fair Value 4,475 4,494
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 51 40
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 113 104
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 164 144
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 2,214 7,373
Investment Securities, Fair Value 2,213 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 1 2
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 25 $ 250
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 25
Investment Securities, Continuous Unrealized Loss Position, Fair Value 25 275
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 8,477 8,913
Investment Securities, Fair Value 9,216 9,790
Investment Securities, Gross Unrealized Gain 739 877
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] 8,477  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 9,216  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4.4 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 4.4 years based upon current prepayment assumptions.