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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 Available-for-sale (Details) $ in Thousands | Dec. 31, 2019 USD ($) Security | Dec. 31, 2018 USD ($) Security
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Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 99 | 179
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 343,722 | $ 191,761
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (2,377) | (2,441)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 257,869 | 427,243
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (2,328) | (17,287)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 601,591 | 619,004
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (4,705) | $ (19,728)
U.S. Government Agencies |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 8 | 25
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 49,318 | $ 43,487
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (662) | (80)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 20,283 | 50,101
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (92) | (1,216)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 69,601 | 93,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (754) | $ (1,296)
Obligations of States, Municipalities, and Political Subdivisions |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 7 | 56
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 13,309 | $ 13,926
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (45) | (97)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 1,419 | 18,563
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (4) | (489)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 14,728 | 32,489
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (49) | $ (586)
Agency, Residential Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 50 | 42
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 132,703 | $ 4,288
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (666) | (45)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 193,363 | 254,121
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (1,688) | (11,131)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 326,066 | 258,409
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (2,354) | $ (11,176)
Non-Agency, Residential Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 9 | 8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 36,902 | $ 59,107
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (206) | (1,378)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 10,126 | 4,009
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (66) | (198)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 47,028 | 63,116
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (272) | $ (1,576)
Agency, Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 13 | 9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 67,649 | $ 21,356
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (563) | (447)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 32,678 | 52,640
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses | (478) | (2,717)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 100,327 | 73,996
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (1,041) | $ (3,164)
Asset-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 8 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 37,738 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (198) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 37,738 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (198) |
Corporate Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security | 4 | 15
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 6,103 | $ 25,762
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses | (37) | (342)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 4,642
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses |  | (268)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value | 6,103 | 30,404
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses | $ (37) | $ (610)
U.S. Treasury Notes |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security |  | 18
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |  | $ 23,835
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses |  | (52)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | 9,865
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses |  | (137)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value |  | 33,700
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses |  | $ (189)
Non-Agency, Commercial Mortgage-Backed Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security |  | 5
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | $ 30,458
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses |  | (1,000)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value |  | 30,458
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses |  | $ (1,000)
Other Securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Number of Securities | Security |  | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |  | $ 2,844
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses |  | (131)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value |  | 2,844
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Unrealized Losses |  | $ (131)

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