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Securities - Fair Value and Age of Gross Unrealized Losses of Debt Securities (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 56 36
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 430,791 $ 271,852
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (6,712) $ (1,373)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 15 15
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 108,907 $ 113,210
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (4,155) $ (2,594)
Temporarily Impaired Debt Securities, Number of Securities | security 71 51
Temporarily Impaired Debt Securities, Fair Value, Total $ 539,698 $ 385,062
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (10,867) $ (3,967)
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 2 3
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 14,661 $ 19,789
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (290) $ (154)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 0 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 0 $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ 0 $ 0
Temporarily Impaired Debt Securities, Number of Securities | security 2 3
Temporarily Impaired Debt Securities, Fair Value, Total $ 14,661 $ 19,789
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (290) $ (154)
Obligations of U.S. government corporations and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 16 9
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 130,823 $ 63,635
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (1,274) $ (144)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 1 1
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 10,000 $ 10,017
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (43) $ (49)
Temporarily Impaired Debt Securities, Number of Securities | security 17 10
Temporarily Impaired Debt Securities, Fair Value, Total $ 140,823 $ 73,652
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (1,317) $ (193)
Collateralized mortgage obligations of U.S. government corporations and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 8 7
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 55,695 $ 47,465
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (800) $ (248)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 7 7
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 43,184 $ 45,809
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (1,683) $ (1,073)
Temporarily Impaired Debt Securities, Number of Securities | security 15 14
Temporarily Impaired Debt Securities, Fair Value, Total $ 98,879 $ 93,274
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (2,483) $ (1,321)
Residential mortgage-backed securities of U.S. government corporations and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 3 1
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 4,861 $ 2,333
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (106) $ (10)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 2 2
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 7,976 $ 8,638
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (354) $ (203)
Temporarily Impaired Debt Securities, Number of Securities | security 5 3
Temporarily Impaired Debt Securities, Fair Value, Total $ 12,837 $ 10,971
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (460) $ (213)
Commercial mortgage-backed securities of U.S. government corporations and agencies    
Schedule of Available-for-sale Securities [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 22 14
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 201,051 $ 128,300
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (4,170) $ (775)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 5 5
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 47,747 $ 48,746
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ (2,075) $ (1,269)
Temporarily Impaired Debt Securities, Number of Securities | security 27 19
Temporarily Impaired Debt Securities, Fair Value, Total $ 248,798 $ 177,046
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (6,245) $ (2,044)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Temporarily Impaired Debt Securities, Less Than 12 Months, Number of Securities | security 5 2
Temporarily Impaired Debt Securities, Less Than 12 Months, Fair Value $ 23,700 $ 10,330
Temporarily Impaired Debt Securities, Less Than 12 Months, Unrealized Losses $ (72) $ (42)
Temporarily Impaired Debt Securities, 12 Months or More, Number of Securities | security 0 0
Temporarily Impaired Debt Securities, 12 Months or More, Fair Value $ 0 $ 0
Temporarily Impaired Debt Securities, 12 Months or More, Unrealized Losses $ 0 $ 0
Temporarily Impaired Debt Securities, Number of Securities | security 5 2
Temporarily Impaired Debt Securities, Fair Value, Total $ 23,700 $ 10,330
Temporarily Impaired Debt Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (72) $ (42)