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Securities - Summary of Gross Unrealized Losses and Fair Values, Aggregated by Investment Category and Length of Individual Securities Continuous Unrealized Loss Position Held-to-maturity (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Security
Dec. 31, 2016
USD ($)
Security
Schedule Of Held To Maturity Securities [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Number of Securities | Security 28 42
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 42,211 $ 97,636
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses (155) (954)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 13,865  
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses (181)  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Total Fair Value 56,076 97,636
Held-to-maturity Securities, Continuous Unrealized Loss Position, Total Unrealized Losses $ (336) $ (954)
Obligations of States, Municipalities, and Political Subdivisions    
Schedule Of Held To Maturity Securities [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Number of Securities | Security 12 22
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 7,409 $ 16,235
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses (38) (229)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,548  
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses (44)  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Total Fair Value 8,957 16,235
Held-to-maturity Securities, Continuous Unrealized Loss Position, Total Unrealized Losses $ (82) $ (229)
Agency, Residential Mortgage-Backed Securities    
Schedule Of Held To Maturity Securities [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Number of Securities | Security 13 15
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 24,344 $ 52,156
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses (107) (283)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 7,935  
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses (96)  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Total Fair Value 32,279 52,156
Held-to-maturity Securities, Continuous Unrealized Loss Position, Total Unrealized Losses $ (203) $ (283)
Non-Agency, Residential Mortgage-Backed Securities    
Schedule Of Held To Maturity Securities [Line Items]    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Number of Securities | Security 3 5
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value $ 10,458 $ 29,245
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses (10) (442)
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 4,382  
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses (41)  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Total Fair Value 14,840 29,245
Held-to-maturity Securities, Continuous Unrealized Loss Position, Total Unrealized Losses $ (51) $ (442)