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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 184,457 $ 210,999
Investment securities, Allowance for Credit Loss (633) (555)
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss 183,824 210,444
Investment Securities, Fair Value 191,235 231,395
Investment Securities, Gross Unrealized Gain 7,438 20,412
Investment Securities, Gross Unrealized Loss $ (660) $ (16)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 38 3
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 24,171 $ 273
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 568 587
Investment Securities, Continuous Unrealized Loss Position, Fair Value 24,739 860
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 601 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 59 14
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 660 16
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 14,901  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 104,681  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 52,359  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 6,030  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 177,971  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 15,080  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 110,636  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 52,834  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 5,944  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 184,494  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 4.55  
Municipal securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 177,683 203,772
Investment Securities, Fair Value 184,214 223,609
Investment Securities, Gross Unrealized Gain 7,155 19,851
Investment Securities, Gross Unrealized Loss $ (624) $ (14)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 35 1
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 22,394 $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 544 587
Investment Securities, Continuous Unrealized Loss Position, Fair Value 22,938 587
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 566 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 58 14
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 624 14
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 6,486 6,939
Investment Securities, Fair Value 6,741 7,500
Investment Securities, Gross Unrealized Gain 283 561
Investment Securities, Gross Unrealized Loss (28) 0
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying Value [2] 6,486  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 6,741  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 4 months 24 days  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1  
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,534  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Investment Securities, Continuous Unrealized Loss Position, Fair Value 1,534  
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 28  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 28  
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 288 288
Investment Securities, Fair Value 280 286
Investment Securities, Gross Unrealized Gain 0 0
Investment Securities, Gross Unrealized Loss $ (8) $ (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 $ 243 $ 273
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 24 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value 267 273
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1 0
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 8 $ 2
[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.