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Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
security
Sep. 30, 2017
USD ($)
security
Held to Maturity:    
Number of positions, less than 12 months (securities) | security 106  
Number of positions, 12 months or more (securities) | security 0  
Number of positions (securities) | security 106  
Fair Value, Less than 12 Months $ 95,277  
Fair Value, 12 Months or More 0  
Fair Value 95,277  
Unrealized Losses, Less than 12 Months (1,965)  
Unrealized Losses, 12 Months or More 0  
Unrealized Losses $ (1,965)  
Available for Sale:    
Number of positions, less than 12 months (securities) | security 184 160
Number of positions, 12 months or more (securities) | security 26 40
Number of positions (securities) | security 210 200
Fair Value, Less than 12 Months $ 427,364 $ 418,207
Fair Value, 12 Months or More 67,255 94,362
Fair Value 494,619 512,569
Unrealized Losses, Less than 12 Months (8,564) (3,138)
Unrealized Losses, 12 Months or More (7,501) (5,811)
Unrealized Losses $ (16,065) $ (8,949)
Trust preferred securities    
Available for Sale:    
Number of positions, less than 12 months (securities) | security 0 0
Number of positions, 12 months or more (securities) | security 3 2
Number of positions (securities) | security 3 2
Fair Value, Less than 12 Months $ 0 $ 0
Fair Value, 12 Months or More 18,389 8,960
Fair Value 18,389 8,960
Unrealized Losses, Less than 12 Months 0 0
Unrealized Losses, 12 Months or More (5,360) (3,494)
Unrealized Losses $ (5,360) $ (3,494)
Other debt securities    
Available for Sale:    
Number of positions, less than 12 months (securities) | security 3 5
Number of positions, 12 months or more (securities) | security 2 1
Number of positions (securities) | security 5 6
Fair Value, Less than 12 Months $ 7,946 $ 9,105
Fair Value, 12 Months or More 2,475 1,205
Fair Value 10,421 10,310
Unrealized Losses, Less than 12 Months (208) (48)
Unrealized Losses, 12 Months or More (10) (8)
Unrealized Losses $ (218) $ (56)
Obligations of other U.S. Government agencies and corporations    
Held to Maturity:    
Number of positions, less than 12 months (securities) | security 4  
Number of positions, 12 months or more (securities) | security 0  
Number of positions (securities) | security 4  
Fair Value, Less than 12 Months $ 11,915  
Fair Value, 12 Months or More 0  
Fair Value 11,915  
Unrealized Losses, Less than 12 Months (187)  
Unrealized Losses, 12 Months or More 0  
Unrealized Losses $ (187)  
Available for Sale:    
Number of positions, less than 12 months (securities) | security 0 4
Number of positions, 12 months or more (securities) | security 0 0
Number of positions (securities) | security 0 4
Fair Value, Less than 12 Months $ 0 $ 12,018
Fair Value, 12 Months or More 0 0
Fair Value 0 12,018
Unrealized Losses, Less than 12 Months 0 (84)
Unrealized Losses, 12 Months or More 0 0
Unrealized Losses $ 0 $ (84)
Obligations of states and political subdivisions    
Held to Maturity:    
Number of positions, less than 12 months (securities) | security 102  
Number of positions, 12 months or more (securities) | security 0  
Number of positions (securities) | security 102  
Fair Value, Less than 12 Months $ 83,362  
Fair Value, 12 Months or More 0  
Fair Value 83,362  
Unrealized Losses, Less than 12 Months (1,778)  
Unrealized Losses, 12 Months or More 0  
Unrealized Losses $ (1,778)  
Available for Sale:    
Number of positions, less than 12 months (securities) | security   16
Number of positions, 12 months or more (securities) | security   3
Number of positions (securities) | security   19
Fair Value, Less than 12 Months   $ 11,248
Fair Value, 12 Months or More   2,037
Fair Value   13,285
Unrealized Losses, Less than 12 Months   (105)
Unrealized Losses, 12 Months or More   (53)
Unrealized Losses   $ (158)
Government agency mortgage backed securities | Residential mortgage-backed securities    
Available for Sale:    
Number of positions, less than 12 months (securities) | security 131 97
Number of positions, 12 months or more (securities) | security 5 12
Number of positions (securities) | security 136 109
Fair Value, Less than 12 Months $ 298,400 $ 249,318
Fair Value, 12 Months or More 11,504 31,392
Fair Value 309,904 280,710
Unrealized Losses, Less than 12 Months (6,042) (1,902)
Unrealized Losses, 12 Months or More (601) (752)
Unrealized Losses $ (6,643) $ (2,654)
Government agency mortgage backed securities | Commercial mortgage-backed securities    
Available for Sale:    
Number of positions, less than 12 months (securities) | security 9 4
Number of positions, 12 months or more (securities) | security 2 3
Number of positions (securities) | security 11 7
Fair Value, Less than 12 Months $ 21,933 $ 9,906
Fair Value, 12 Months or More 1,101 5,978
Fair Value 23,034 15,884
Unrealized Losses, Less than 12 Months (453) (25)
Unrealized Losses, 12 Months or More (8) (148)
Unrealized Losses $ (461) $ (173)
Government agency collateralized mortgage obligations | Residential mortgage-backed securities    
Available for Sale:    
Number of positions, less than 12 months (securities) | security 40 34
Number of positions, 12 months or more (securities) | security 14 19
Number of positions (securities) | security 54 53
Fair Value, Less than 12 Months $ 97,356 $ 126,612
Fair Value, 12 Months or More 33,786 44,790
Fair Value 131,142 171,402
Unrealized Losses, Less than 12 Months (1,845) (974)
Unrealized Losses, 12 Months or More (1,522) (1,356)
Unrealized Losses $ (3,367) $ (2,330)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities    
Available for Sale:    
Number of positions, less than 12 months (securities) | security 1 0
Number of positions, 12 months or more (securities) | security 0 0
Number of positions (securities) | security 1 0
Fair Value, Less than 12 Months $ 1,729 $ 0
Fair Value, 12 Months or More 0 0
Fair Value 1,729 0
Unrealized Losses, Less than 12 Months (16) 0
Unrealized Losses, 12 Months or More 0 0
Unrealized Losses $ (16) $ 0