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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 269,616 $ 293,418
Investment securities, Allowance for Credit Loss (1,628) [1] 0
Investments securities, Amortized Cost, Net of Allowance 267,988 293,418
Investment Securities, Fair Value 299,126 314,402
Investment Securities, Gross Unrealized Gain 29,541 21,285
Investment Securities, Gross Unrealized Loss $ (31) $ (301)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 4 17
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 1,276
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,142 9,747
Investment Securities, Continuous Unrealized Loss Position, Fair Value 2,142 11,023
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 2
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 31 299
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 31 301
Fixed Maturity Securities [Member]    
Investment Securities, Debt Maturities, Net Carrying Value [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 39,734  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 87,863  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 122,309  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 9,898  
Investment Securities, Debt Maturities, Single Maturity Date, Net Carrying Value 259,804  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Fair Value 40,151  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 96,615  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 141,378  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 10,248  
Investment Securities, Debt Maturities, Single Maturity Date, Fair Value $ 288,392  
Investment Securities, Debt Maturities, Weighted Average Maturity [2] 4.95  
Municipal and other tax-exempt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost $ 84,239 93,653
Investment Securities, Fair Value 88,623 96,897
Investment Securities, Gross Unrealized Gain 4,384 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 175,565 189,089
Investment Securities, Fair Value 199,769 206,341
Investment Securities, Gross Unrealized Gain 24,235 17,547
Investment Securities, Gross Unrealized Loss $ (31) $ (295)
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 4 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 2,142 8,041
Investment Securities, Continuous Unrealized Loss Position, Fair Value 2,142 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 31 294
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 31 295
Residential agency mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment Securities, Gross Amortized Cost 9,812 10,676
Investment Securities, Fair Value 10,734 11,164
Investment Securities, Gross Unrealized Gain 922 488
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] 9,812  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 10,734  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4.6 years  
[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 4.6 years based upon current prepayment assumptions.