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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 256,740 $ 293,418
Investment securities, Allowance for Credit Loss (739) [1] 0
Investments securities, Amortized Cost, Net of Allowance 256,001 293,418
Investment Securities, Fair Value 284,929 314,402
Investment Securities, Gross Unrealized Gain 28,388 21,285
Investment Securities, Gross Unrealized Loss $ (199) $ (301)
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 $ 3,026 $ 1,276
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,043 9,747
Investment Securities, Continuous Unrealized Loss Position, Fair Value 5,069 11,023
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 68 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 131 299
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 199 301
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 30,455  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 87,606  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 120,073  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 9,289  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 247,423  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 30,761  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 95,912  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 138,580  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 9,457  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 274,710  
Investment Securities, Debt Maturities, Weighted Average Maturity [2] 4.94  
Municipal and other tax-exempt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 76,109 93,653
Investment Securities, Fair Value 80,368 96,897
Investment Securities, Gross Unrealized Gain 4,259 3,250
Investment Securities, Gross Unrealized Loss 0 $ (6)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions   4
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   $ 1,001
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   1,706
Investment Securities, Continuous Unrealized Loss Position, Fair Value   2,707
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss   1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss   5
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss   6
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 171,314 189,089
Investment Securities, Fair Value 194,342 206,341
Investment Securities, Gross Unrealized Gain 23,227 17,547
Investment Securities, Gross Unrealized Loss $ (199) $ (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 $ 3,026 $ 275
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,043 8,041
Investment Securities, Continuous Unrealized Loss Position, Fair Value 5,069 8,316
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 68 1
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 131 294
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 199 295
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 9,317 10,676
Investment Securities, Fair Value 10,219 11,164
Investment Securities, Gross Unrealized Gain 902 488
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 [3] 9,317  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 10,219  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4.58  
[1] Effective with the adoption of FASB ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326) on January 1, 2020.
[2] Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
[3] The average expected lives of residential mortgage-backed securities were 4.58 years based upon current prepayment assumptions.