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Securities - Unrealized Loss Positions (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
security
Dec. 31, 2013
security
Number of Securities    
Less than 12 months in an unrealized loss position 33 27
Greater than 12 months in an unrealized loss position 11 5
Total 44 32
Unrealized Losses    
Less than 12 months in an unrealized loss position $ 2,932 $ 6,633
Greater than 12 months in an unrealized loss position 2,739 532
Total 5,671 7,165
Fair Value    
Less than 12 months in an unrealized loss position 241,940 170,149
Greater than 12 months in an unrealized loss position 71,657 10,836
Total 313,597 180,985
Number of Securities    
Less than 12 months in an unrealized loss position 14 25
Greater than 12 months in an unrealized loss position 2  
Total 16 25
Unrealized Losses    
Less than 12 months in an unrealized loss position 1,175 2,931
Greater than 12 months in an unrealized loss position 885  
Total 2,060 2,931
Fair Value    
Less than 12 months in an unrealized loss position 85,517 175,766
Greater than 12 months in an unrealized loss position 37,828  
Total 123,345 175,766
U.S. Treasury
    
Number of Securities    
Less than 12 months in an unrealized loss position 1 1
Total 1 1
Unrealized Losses    
Less than 12 months in an unrealized loss position 1 5
Total 1 5
Fair Value    
Less than 12 months in an unrealized loss position 1,532 1,544
Total 1,532 1,544
U.S. government agencies
    
Number of Securities    
Greater than 12 months in an unrealized loss position 1 1
Total 1 1
Unrealized Losses    
Greater than 12 months in an unrealized loss position 80 66
Total 80 66
Fair Value    
Greater than 12 months in an unrealized loss position 1,638 1,672
Total 1,638 1,672
U.S. government agency mortgage-backed
    
Number of Securities    
Less than 12 months in an unrealized loss position 1  
Total 1  
Unrealized Losses    
Less than 12 months in an unrealized loss position 11  
Total 11  
Fair Value    
Less than 12 months in an unrealized loss position 1,972  
Total 1,972  
Number of Securities    
Less than 12 months in an unrealized loss position   6
Total   6
Unrealized Losses    
Less than 12 months in an unrealized loss position   73
Total   73
Fair Value    
Less than 12 months in an unrealized loss position   19,134
Total   19,134
States and political subdivisions
    
Number of Securities    
Less than 12 months in an unrealized loss position 3 6
Greater than 12 months in an unrealized loss position 2  
Total 5 6
Unrealized Losses    
Less than 12 months in an unrealized loss position 215 217
Greater than 12 months in an unrealized loss position 13  
Total 228 217
Fair Value    
Less than 12 months in an unrealized loss position 4,450 4,625
Greater than 12 months in an unrealized loss position 1,862  
Total 6,312 4,625
Corporate bonds
    
Number of Securities    
Less than 12 months in an unrealized loss position 5 4
Greater than 12 months in an unrealized loss position 2 2
Total 7 6
Unrealized Losses    
Less than 12 months in an unrealized loss position 463 429
Greater than 12 months in an unrealized loss position 93 219
Total 556 648
Fair Value    
Less than 12 months in an unrealized loss position 20,581 10,493
Greater than 12 months in an unrealized loss position 2,411 2,796
Total 22,992 13,289
Collateralized mortgage obligations
    
Number of Securities    
Less than 12 months in an unrealized loss position 1 5
Greater than 12 months in an unrealized loss position 3  
Total 4 5
Unrealized Losses    
Less than 12 months in an unrealized loss position 18 3,146
Greater than 12 months in an unrealized loss position 1,557  
Total 1,575 3,146
Fair Value    
Less than 12 months in an unrealized loss position 4,739 54,021
Greater than 12 months in an unrealized loss position 21,704  
Total 26,443 54,021
Number of Securities    
Less than 12 months in an unrealized loss position 13 19
Greater than 12 months in an unrealized loss position 2  
Total 15 19
Unrealized Losses    
Less than 12 months in an unrealized loss position 1,164 2,858
Greater than 12 months in an unrealized loss position 885  
Total 2,049 2,858
Fair Value    
Less than 12 months in an unrealized loss position 83,545 156,632
Greater than 12 months in an unrealized loss position 37,828  
Total 121,373 156,632
Asset-backed securities
    
Number of Securities    
Less than 12 months in an unrealized loss position 10 11
Greater than 12 months in an unrealized loss position 3 2
Total 13 13
Unrealized Losses    
Less than 12 months in an unrealized loss position 1,231 2,836
Greater than 12 months in an unrealized loss position 996 247
Total 2,227 3,083
Fair Value    
Less than 12 months in an unrealized loss position 117,440 99,466
Greater than 12 months in an unrealized loss position 44,042 6,368
Total 161,482 105,834
Collateralized loan obligations
    
Number of Securities    
Less than 12 months in an unrealized loss position 13  
Total 13  
Unrealized Losses    
Less than 12 months in an unrealized loss position 1,004  
Total 1,004  
Fair Value    
Less than 12 months in an unrealized loss position 93,198  
Total $ 93,198