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Securities - (Details 4)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
security
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
security
Held to Maturity:      
Number of positions, less than 12 months (securities) | security 57   106
Number of positions, 12 months or more (securities) | security 0   0
Number of positions (securities) | security 57   106
Fair value, less than 12 months $ 56,158   $ 95,277
Fair value, 12 months or more 0   0
Fair value 56,158   $ 95,277
Unrealized losses, less than 12 months (1,064) $ (1,965)  
Unrealized losses, 12 months or more 0 0  
Unrealized losses $ (1,064) (1,965)  
Available for Sale:      
Number of positions, less than 12 months (securities) | security 149   184
Number of positions, 12 months or more (securities) | security 30   26
Number of positions (securities) | security 179   210
Fair value, less than 12 months $ 387,021   $ 427,364
Fair value, 12 months or more 73,580   67,255
Fair value 460,601   494,619
Unrealized losses, less than 12 months (5,498)   (8,564)
Unrealized losses, 12 months or more (6,732)   (7,501)
Unrealized losses $ (12,230)   $ (16,065)
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   3
Number of positions (securities) | security 3   3
Fair value, less than 12 months $ 0   $ 0
Fair value, 12 months or more 17,823   18,389
Fair value 17,823   18,389
Unrealized losses, less than 12 months 0   0
Unrealized losses, 12 months or more (4,823)   (5,360)
Unrealized losses $ (4,823)   $ (5,360)
Other debt securities      
Available for Sale:      
Number of positions, less than 12 months (securities) | security 2   3
Number of positions, 12 months or more (securities) | security 2   2
Number of positions (securities) | security 4   5
Fair value, less than 12 months $ 6,971   $ 7,946
Fair value, 12 months or more 2,410   2,475
Fair value 9,381   10,421
Unrealized losses, less than 12 months (131)   (208)
Unrealized losses, 12 months or more (9)   (10)
Unrealized losses $ (140)   $ (218)
Obligations of other U.S. Government agencies and corporations      
Held to Maturity:      
Number of positions, less than 12 months (securities) | security 4   4
Number of positions, 12 months or more (securities) | security 0   0
Number of positions (securities) | security 4   4
Fair value, less than 12 months $ 11,965   $ 11,915
Fair value, 12 months or more 0   0
Fair value 11,965   $ 11,915
Unrealized losses, less than 12 months (137) (187)  
Unrealized losses, 12 months or more 0 0  
Unrealized losses $ (137) (187)  
Available for Sale:      
Number of positions, less than 12 months (securities) | security 0   0
Number of positions, 12 months or more (securities) | security 0   0
Number of positions (securities) | security 0   0
Fair value, less than 12 months $ 0   $ 0
Fair value, 12 months or more 0   0
Fair value 0   0
Unrealized losses, less than 12 months 0   0
Unrealized losses, 12 months or more 0   0
Unrealized losses $ 0   $ 0
Obligations of states and political subdivisions      
Held to Maturity:      
Number of positions, less than 12 months (securities) | security 53   102
Number of positions, 12 months or more (securities) | security 0   0
Number of positions (securities) | security 53   102
Fair value, less than 12 months $ 44,193   $ 83,362
Fair value, 12 months or more 0   0
Fair value 44,193   $ 83,362
Unrealized losses, less than 12 months (927) (1,778)  
Unrealized losses, 12 months or more 0 0  
Unrealized losses $ (927) $ (1,778)  
Government agency mortgage backed securities | Residential mortgage-backed securities      
Available for Sale:      
Number of positions, less than 12 months (securities) | security 104   131
Number of positions, 12 months or more (securities) | security 8   5
Number of positions (securities) | security 112   136
Fair value, less than 12 months $ 256,655   $ 298,400
Fair value, 12 months or more 17,487   11,504
Fair value 274,142   309,904
Unrealized losses, less than 12 months (3,585)   (6,042)
Unrealized losses, 12 months or more (580)   (601)
Unrealized losses $ (4,165)   $ (6,643)
Government agency mortgage backed securities | Commercial mortgage-backed securities      
Available for Sale:      
Number of positions, less than 12 months (securities) | security 6   9
Number of positions, 12 months or more (securities) | security 2   2
Number of positions (securities) | security 8   11
Fair value, less than 12 months $ 15,666   $ 21,933
Fair value, 12 months or more 1,091   1,101
Fair value 16,757   23,034
Unrealized losses, less than 12 months (294)   (453)
Unrealized losses, 12 months or more (8)   (8)
Unrealized losses $ (302)   $ (461)
Government agency collateralized mortgage obligations | Residential mortgage-backed securities      
Available for Sale:      
Number of positions, less than 12 months (securities) | security 36   40
Number of positions, 12 months or more (securities) | security 15   14
Number of positions (securities) | security 51   54
Fair value, less than 12 months $ 106,006   $ 97,356
Fair value, 12 months or more 34,769   33,786
Fair value 140,775   131,142
Unrealized losses, less than 12 months (1,475)   (1,845)
Unrealized losses, 12 months or more (1,312)   (1,522)
Unrealized losses $ (2,787)   $ (3,367)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities      
Available for Sale:      
Number of positions, less than 12 months (securities) | security 1   1
Number of positions, 12 months or more (securities) | security 0   0
Number of positions (securities) | security 1   1
Fair value, less than 12 months $ 1,723   $ 1,729
Fair value, 12 months or more 0   0
Fair value 1,723   1,729
Unrealized losses, less than 12 months (13)   (16)
Unrealized losses, 12 months or more 0   0
Unrealized losses $ (13)   $ (16)