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Investment (Held-to-Maturity) Securities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities $ 355,187 $ 461,793
Investment Securities, Fair Value 367,298 480,035
Investment Securities, Gross Unrealized Gain 14,408 20,508
Investment Securities, Gross Unrealized Loss (2,297) (2,266)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]    
Investment Securities, Debt Maturities, Amortized Cost 355,187 461,793
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Fair Value $ 367,298 $ 480,035
Investment Securities, Debt Maturities, Nominal Yield [Abstract]    
Investment Securities, Debt Maturities, Nominal Yield 4.65%  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 146 150
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 31,627 $ 166,051
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 94,802 12,265
Investment Securities, Continuous Unrealized Loss Position, Fair Value 126,429 178,316
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses 133 1,881
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses 2,164 385
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 2,297 2,266
Fixed maturity securities [Member]    
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 57,757  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 108,193  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 150,683  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 25,942  
Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value 342,575  
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Fair Value 57,698  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 110,046  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 161,521  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 25,263  
Investment Securities, Debt Maturities, Single Maturity Date, Fair value $ 354,528  
Investment Securities, Debt Maturities, Nominal Yield [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield 2.71%  
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield 4.37%  
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield 5.82%  
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield 4.32%  
Investment Securities, Debt Maturities, Nominal Yield 4.73%  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 5.19  
Municipal and other tax-exempt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities $ 137,296 228,186
Investment Securities, Fair Value 138,562 230,349
Investment Securities, Gross Unrealized Gain 1,858 2,967
Investment Securities, Gross Unrealized Loss (592) (804)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 41,475  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 46,363  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 35,077  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 14,381  
Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value 137,296  
Investment Securities, Debt Maturities, Amortized Cost 137,296 228,186
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Fair Value 41,371  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 46,123  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 36,471  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 14,597  
Investment Securities, Debt Maturities, Single Maturity Date, Fair value 138,562  
Investment Securities, Fair Value $ 138,562 $ 230,349
Investment Securities, Debt Maturities, Nominal Yield [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield [2] 2.25%  
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield [2] 3.94%  
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield [2] 6.00%  
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield [2] 4.32%  
Investment Securities, Debt Maturities, Nominal Yield [2] 4.00%  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 4.73  
Investment Securities, Debt Maturities, Effective tax rate for nominal yield calculation 25.00%  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 72 100
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 18,255 $ 145,960
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 66,141 5,833
Investment Securities, Continuous Unrealized Loss Position, Fair Value 84,396 151,793
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses 69 643
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses 523 161
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 592 804
Other debt securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities 205,279 217,716
Investment Securities, Fair Value 215,966 233,444
Investment Securities, Gross Unrealized Gain 12,257 17,095
Investment Securities, Gross Unrealized Loss (1,570) (1,367)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Net Carrying Value 16,282  
Investment Securities, Debt Maturities, One to Five Years, Net Carrying Value 61,830  
Investment Securities, Debt Maturities, Six to Ten Years, Net Carrying Value 115,606  
Investment Securities, Debt Maturities, Over Ten Years, Net Carrying Value 11,561  
Investment Securities, Debt Maturities, Single Maturity Date, Carrying Value 205,279  
Investment Securities, Debt Maturities, Amortized Cost 205,279 217,716
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, Less than One Year, Fair Value 16,327  
Investment Securities, Debt Maturities, One to Five Years, Fair Value 63,923  
Investment Securities, Debt Maturities, Six to Ten Years, Fair Value 125,050  
Investment Securities, Debt Maturities, Over Ten Years, Fair Value 10,666  
Investment Securities, Debt Maturities, Single Maturity Date, Fair value 215,966  
Investment Securities, Fair Value $ 215,966 $ 233,444
Investment Securities, Debt Maturities, Nominal Yield [Abstract]    
Investment Securities, Debt Maturities, Less Than One Year, Nominal Yield 3.88%  
Investment Securities, Debt Maturities, One to Five Years, Nominal Yield 4.69%  
Investment Securities, Debt Maturities, Six to Ten Years, Nominal Yield 5.76%  
Investment Securities, Debt Maturities, Over Ten Years, Nominal Yield 4.33%  
Investment Securities, Debt Maturities, Nominal Yield 5.21%  
Investment Securities, Debt Maturities, Weighted Average Maturity [1] 5.50  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 72 49
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 13,372 $ 20,091
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 23,028 3,076
Investment Securities, Continuous Unrealized Loss Position, Fair Value 36,400 23,167
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses 64 1,238
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses 1,506 129
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,570 1,367
U.S. government agency residential mortgage-backed securities [Member]    
Schedule of Investment (Held-to-Maturity) Securities [Line Items]    
Investment securities 12,612 15,891
Investment Securities, Fair Value 12,770 16,242
Investment Securities, Gross Unrealized Gain 293 446
Investment Securities, Gross Unrealized Loss (135) (95)
Investment Securities, Debt Maturities, Net, Amortized Cost [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Net Carrying value 12,612  
Investment Securities, Debt Maturities, Amortized Cost 12,612 15,891
Investment Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]    
Investment Securities, Debt Maturities, without Single Maturity Date, Fair value 12,770  
Investment Securities, Fair Value $ 12,770 $ 16,242
Investment Securities, Debt Maturities, Nominal Yield [Abstract]    
Investment Securities, Debt Maturities, Nominal Yield 2.77%  
Investment Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 8 months 12 days  
Investment Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]    
Investment Securities, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2 1
Investment Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0 $ 0
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 5,633 3,356
Investment Securities, Continuous Unrealized Loss Position, Fair Value 5,633 3,356
Investment Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]    
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Losses 0 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Losses 135 95
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 135 $ 95
[1] Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalty.
[2] Calculated on a taxable equivalent basis using a 25 percent effective tax rate.