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Investment Securities - Investment Securities in Unrealized Loss Positions (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Number of investment securities other-than-temporarily impaired | security 0  
Number of investment securities in unrealized loss position | security 37 54
Held-to-maturity, less than 12 continuous months, Fair value $ 4,070 $ 14,152
Held-to-maturity, less than 12 continuous months, Unrealized loss (4) (41)
Held-to-maturity, greater than 12 continuous months, Fair value 0 1,999
Held-to-maturity, greater than 12 continuous months, Unrealized loss 0 (1)
Held-to-maturity, Total Securities in a loss position, Fair value 4,070 16,151
Held-to-maturity, Gross Unrealized Losses (4) (42)
Available-for-sale, less than 12 continuous months, Fair value 98,619 221,857
Available-for-sale, less than 12 continuous months, Unrealized loss (329) (1,273)
Available-for-sale, greater than 12 continuous months, Fair value 0 17,987
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 (233)
Available-for-sale, Total Securities in a loss position, Fair Value 98,619 239,844
Available-for-sale, Total Securities in a loss position, Unrealized loss (329) (1,506)
Marketable securities, less than 12 continuous months, Fair value 102,689 236,009
Marketable securities, less than 12 continuous months, Unrealized loss (333) (1,314)
Marketable securities, greater than 12 continuous months, Fair value 0 19,986
Marketable securities, greater than 12 continuous months, Unrealized loss 0 (234)
Marketable securities, Total Securities in a loss position, Fair value 102,689 255,995
Marketable securities, Total Securities in a loss position, Unrealized loss $ (333) (1,548)
Number of investment securities in unrealized loss position less than 12 months | security 37  
MBS pass-through securities issued by FHLMC and FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value $ 69,229 68,809
Available-for-sale, less than 12 continuous months, Unrealized loss (227) (454)
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 69,229 68,809
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (227) (454)
Number of investment securities in unrealized loss position less than 12 months | security 10  
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value   9,277
Available-for-sale, less than 12 continuous months, Unrealized loss   (80)
Available-for-sale, greater than 12 continuous months, Fair value   3,158
Available-for-sale, greater than 12 continuous months, Unrealized loss   (64)
Available-for-sale, Total Securities in a loss position, Fair Value   12,435
Available-for-sale, Total Securities in a loss position, Unrealized loss   (144)
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value   0
Available-for-sale, less than 12 continuous months, Unrealized loss   0
Available-for-sale, greater than 12 continuous months, Fair value   1,989
Available-for-sale, greater than 12 continuous months, Unrealized loss   (39)
Available-for-sale, Total Securities in a loss position, Fair Value   1,989
Available-for-sale, Total Securities in a loss position, Unrealized loss   (39)
CMOs issued by GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value   164
Available-for-sale, less than 12 continuous months, Unrealized loss   0
Available-for-sale, greater than 12 continuous months, Fair value   2,374
Available-for-sale, greater than 12 continuous months, Unrealized loss   (15)
Available-for-sale, Total Securities in a loss position, Fair Value   2,538
Available-for-sale, Total Securities in a loss position, Unrealized loss   (15)
Debentures of government- sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value $ 14,992 136,064
Available-for-sale, less than 12 continuous months, Unrealized loss (8) (713)
Available-for-sale, greater than 12 continuous months, Fair value 0 9,887
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 (113)
Available-for-sale, Total Securities in a loss position, Fair Value 14,992 145,951
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (8) (826)
Number of investment securities in unrealized loss position less than 12 months | security 2  
Privately issued CMOs    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value $ 162  
Available-for-sale, less than 12 continuous months, Unrealized loss (1)  
Available-for-sale, greater than 12 continuous months, Fair value 0  
Available-for-sale, greater than 12 continuous months, Unrealized loss 0  
Available-for-sale, Total Securities in a loss position, Fair Value 162  
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (1)  
Number of investment securities in unrealized loss position less than 12 months | security 1  
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value $ 14,236 4,557
Available-for-sale, less than 12 continuous months, Unrealized loss (93) (15)
Available-for-sale, greater than 12 continuous months, Fair value 0 579
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 (2)
Available-for-sale, Total Securities in a loss position, Fair Value 14,236 5,136
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (93) (17)
Number of investment securities in unrealized loss position less than 12 months | security 23  
Corporate bonds    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available-for-sale, less than 12 continuous months, Fair value   2,986
Available-for-sale, less than 12 continuous months, Unrealized loss   (11)
Available-for-sale, greater than 12 continuous months, Fair value   0
Available-for-sale, greater than 12 continuous months, Unrealized loss   0
Available-for-sale, Total Securities in a loss position, Fair Value   2,986
Available-for-sale, Total Securities in a loss position, Unrealized loss   (11)
Number of investment securities in unrealized loss position less than 12 months | security 1  
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held-to-maturity, less than 12 continuous months, Fair value $ 547 8,297
Held-to-maturity, less than 12 continuous months, Unrealized loss (3) (19)
Held-to-maturity, greater than 12 continuous months, Fair value 0 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss 0 0
Held-to-maturity, Total Securities in a loss position, Fair value 547 8,297
Held-to-maturity, Gross Unrealized Losses (3) (19)
Corporate bonds    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held-to-maturity, less than 12 continuous months, Fair value 3,523 3,523
Held-to-maturity, less than 12 continuous months, Unrealized loss (1) (15)
Held-to-maturity, greater than 12 continuous months, Fair value 0 1,999
Held-to-maturity, greater than 12 continuous months, Unrealized loss 0 (1)
Held-to-maturity, Total Securities in a loss position, Fair value 3,523 5,522
Held-to-maturity, Gross Unrealized Losses $ (1) (16)
MBS pass-through securities issued by FHLMC and FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held-to-maturity, less than 12 continuous months, Fair value   2,332
Held-to-maturity, less than 12 continuous months, Unrealized loss   (7)
Held-to-maturity, greater than 12 continuous months, Fair value   0
Held-to-maturity, greater than 12 continuous months, Unrealized loss   0
Held-to-maturity, Total Securities in a loss position, Fair value   2,332
Held-to-maturity, Gross Unrealized Losses   $ (7)