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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 274,078 $ 293,418
Investment securities, Allowance for Credit Loss (1,502) 0
Investments securities, Amortized Cost, Net of Allowance 272,576 293,418
Investment Securities, Fair Value 296,402 314,402
Investment Securities, Gross Unrealized Gain 22,425 21,285
Investment Securities, Gross Unrealized Loss $ (101) $ (301)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 10 17
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 232 $ 1,276
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5,515 9,747
Investment Securities, Continuous Unrealized Loss Position, Fair Value 5,747 11,023
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 100 299
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 101 301
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 38,058  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 91,847  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 122,431  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 11,489  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 263,825  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 38,380  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 97,946  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 137,365  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 11,612  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 285,303  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 5.12  
Municipal and other tax-exempt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 86,212 93,653
Investment Securities, Fair Value 89,359 96,897
Investment Securities, Gross Unrealized Gain 3,149 3,250
Investment Securities, Gross Unrealized Loss $ (2) $ (6)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2 4
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 232 $ 1,001
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 347 1,706
Investment Securities, Continuous Unrealized Loss Position, Fair Value 579 2,707
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 1 5
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 2 6
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 177,613 189,089
Investment Securities, Fair Value 195,944 206,341
Investment Securities, Gross Unrealized Gain 18,430 17,547
Investment Securities, Gross Unrealized Loss $ (99) $ (295)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 8 13
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 275
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5,168 8,041
Investment Securities, Continuous Unrealized Loss Position, Fair Value 5,168 8,316
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 99 294
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 99 295
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 10,253 10,676
Investment Securities, Fair Value 11,099 11,164
Investment Securities, Gross Unrealized Gain 846 488
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] 10,253  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 11,099  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 8 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 4.7 years based upon current prepayment assumptions.