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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 1 21
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 2,367 $ 167,839
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (5) $ (1,757)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 53 44
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 380,443 $ 307,481
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (3,673) $ (6,871)
Temporarily Impaired Debt Securities, Number of Securities | security 54 65
Temporarily Impaired Debt Securities, Fair Value, Total $ 382,810 $ 475,320
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (3,678) $ (8,628)
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 0 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 0 $ 0
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ 0 $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 1 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 9,837 $ 9,736
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (124) $ (222)
Temporarily Impaired Debt Securities, Number of Securities | security 1 1
Temporarily Impaired Debt Securities, Fair Value, Total $ 9,837 $ 9,736
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (124) $ (222)
Obligations of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 0 7
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 0 $ 67,649
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ 0 $ (613)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 8 6
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 65,828 $ 35,760
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (267) $ (461)
Temporarily Impaired Debt Securities, Number of Securities | security 8 13
Temporarily Impaired Debt Securities, Fair Value, Total $ 65,828 $ 103,409
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (267) $ (1,074)
Collateralized mortgage obligations of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 1 2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 2,367 $ 12,495
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (5) $ (44)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 14 14
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 72,936 $ 76,179
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (1,161) $ (1,941)
Temporarily Impaired Debt Securities, Number of Securities | security 15 16
Temporarily Impaired Debt Securities, Fair Value, Total $ 75,303 $ 88,674
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (1,166) $ (1,985)
Residential mortgage-backed securities of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 0 2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 0 $ 2,327
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ 0 $ (45)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 5 3
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 11,297 $ 9,241
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (196) $ (372)
Temporarily Impaired Debt Securities, Number of Securities | security 5 5
Temporarily Impaired Debt Securities, Fair Value, Total $ 11,297 $ 11,568
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (196) $ (417)
Commercial mortgage-backed securities of U.S. government corporations and agencies    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 0 8
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 0 $ 75,466
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ 0 $ (1,032)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 24 19
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 215,320 $ 171,318
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (1,914) $ (3,844)
Temporarily Impaired Debt Securities, Number of Securities | security 24 27
Temporarily Impaired Debt Securities, Fair Value, Total $ 215,320 $ 246,784
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (1,914) $ (4,876)
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 0 2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 0 $ 9,902
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ 0 $ (23)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 1 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 5,225 $ 5,247
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (11) $ (31)
Temporarily Impaired Debt Securities, Number of Securities | security 1 3
Temporarily Impaired Debt Securities, Fair Value, Total $ 5,225 $ 15,149
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (11) $ (54)