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Investment Securities - Other Than Temporarily Impaired Debt Securities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
security
Dec. 31, 2013
USD ($)
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]      
Number of securities considered other than temporarily impaired | security 0    
Other-than-temporary impairment on securities available-for-sale $ 0 $ 13 $ 0
Number of investment securities in unrealized loss positions | security 54 28  
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]      
Held-to-maturity, Less than 12 continuous months, Fair value $ 14,152 $ 8,839  
Held-to-maturity, Less than 12 continuous months, Unrealized loss (41) (28)  
Held-to-maturity, Greater than 12 continuous months, Fair value 1,999 3,892  
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (1) (37)  
Held-to-maturity, Total securities in a loss position, Fair value 16,151 12,731  
Held-to-maturity, Total securities in a loss position, Unrealized loss (42) (65)  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value 221,857 27,387  
Available-for-sale, Less than 12 continuous months, Unrealized loss (1,273) (91)  
Available-for-sale, Greater than 12 continuous months, Fair value 17,987 18,277  
Available-for-sale, Greater than 12 continuous months, Unrealized loss (233) (340)  
Available-for-sale, Total securities in a loss position, Fair value 239,844 45,664  
Available-for-sale, Total securities in a loss position, Unrealized loss (1,506) (431)  
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]      
Total temporarily impaired securities, Less than 12 continuous months, Fair value 236,009 36,226  
Total temporarily impaired securities, Less than 12 continuous months, Unrealized loss (1,314) (119)  
Total temporarily impaired securities, Greater than 12 continuous months, Fair value 19,986 22,169  
Total temporarily impaired securities, Greater than 12 continuous months, Unrealized loss (234) (377)  
Total temporarily impaired securities, Total securities in a loss position, Fair value 255,995 58,395  
Total temporarily impaired securities, Total securities in a loss position, Unrealized loss $ (1,548) (496)  
Number of securities in continuous loss position for more than 12 months | security 6    
Number of securities in continuous loss position for less than 12 months | security 48    
Net loss on sale of available for sale securities sold $ 1 28 $ 104
Collateralized Mortgage Obligations      
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]      
Number of securities in continuous loss position for more than 12 months | security 3    
CMOs issued by FNMA      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value $ 9,277 0  
Available-for-sale, Less than 12 continuous months, Unrealized loss (80) 0  
Available-for-sale, Greater than 12 continuous months, Fair value 3,158 4,115  
Available-for-sale, Greater than 12 continuous months, Unrealized loss (64) (58)  
Available-for-sale, Total securities in a loss position, Fair value 12,435 4,115  
Available-for-sale, Total securities in a loss position, Unrealized loss (144) (58)  
CMOs issued by FHLMC      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value 0 17,157  
Available-for-sale, Less than 12 continuous months, Unrealized loss 0 (44)  
Available-for-sale, Greater than 12 continuous months, Fair value 1,989 2,291  
Available-for-sale, Greater than 12 continuous months, Unrealized loss (39) (43)  
Available-for-sale, Total securities in a loss position, Fair value 1,989 19,448  
Available-for-sale, Total securities in a loss position, Unrealized loss (39) (87)  
Privately-issued CMOs      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value   817  
Available-for-sale, Less than 12 continuous months, Unrealized loss   (15)  
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   817  
Available-for-sale, Total securities in a loss position, Unrealized loss   (15)  
CMOs issued by GNMA      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value 164 3,262  
Available-for-sale, Less than 12 continuous months, Unrealized loss 0 (16)  
Available-for-sale, Greater than 12 continuous months, Fair value 2,374 0  
Available-for-sale, Greater than 12 continuous months, Unrealized loss (15) 0  
Available-for-sale, Total securities in a loss position, Fair value 2,538 3,262  
Available-for-sale, Total securities in a loss position, Unrealized loss (15) (16)  
Debentures of government-sponsored agencies      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value 136,064 494  
Available-for-sale, Less than 12 continuous months, Unrealized loss (713) (1)  
Available-for-sale, Greater than 12 continuous months, Fair value 9,887 9,769  
Available-for-sale, Greater than 12 continuous months, Unrealized loss (113) (231)  
Available-for-sale, Total securities in a loss position, Fair value 145,951 10,263  
Available-for-sale, Total securities in a loss position, Unrealized loss (826) (232)  
MBS pass-through securities      
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value 68,809 1,960  
Available-for-sale, Less than 12 continuous months, Unrealized loss (454) (11)  
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 68,809 1,960  
Available-for-sale, Total securities in a loss position, Unrealized loss (454) (11)  
MBS pass-through securities      
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]      
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, Total securities in a loss position, Unrealized loss (7) 0  
Obligations of state and political subdivisions      
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]      
Held-to-maturity, Less than 12 continuous months, Fair value 8,297 5,830  
Held-to-maturity, Less than 12 continuous months, Unrealized loss (19) (27)  
Held-to-maturity, Greater than 12 continuous months, Fair value 0 359  
Held-to-maturity, Greater than 12 continuous months, Unrealized loss 0 (13)  
Held-to-maturity, Total securities in a loss position, Fair value 8,297 6,189  
Held-to-maturity, Total securities in a loss position, Unrealized loss (19) (40)  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value 4,557 2,695  
Available-for-sale, Less than 12 continuous months, Unrealized loss (15) (3)  
Available-for-sale, Greater than 12 continuous months, Fair value 579 1,112  
Available-for-sale, Greater than 12 continuous months, Unrealized loss (2) (5)  
Available-for-sale, Total securities in a loss position, Fair value 5,136 3,807  
Available-for-sale, Total securities in a loss position, Unrealized loss (17) (8)  
Corporate bonds      
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract]      
Held-to-maturity, Less than 12 continuous months, Fair value 3,523 3,009  
Held-to-maturity, Less than 12 continuous months, Unrealized loss (15) (1)  
Held-to-maturity, Greater than 12 continuous months, Fair value 1,999 3,533  
Held-to-maturity, Greater than 12 continuous months, Unrealized loss (1) (24)  
Held-to-maturity, Total securities in a loss position, Fair value 5,522 6,542  
Held-to-maturity, Total securities in a loss position, Unrealized loss (16) (25)  
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]      
Available-for-sale, Less than 12 continuous months, Fair value 2,986 1,002  
Available-for-sale, Less than 12 continuous months, Unrealized loss (11) (1)  
Available-for-sale, Greater than 12 continuous months, Fair value 0 990  
Available-for-sale, Greater than 12 continuous months, Unrealized loss 0 (3)  
Available-for-sale, Total securities in a loss position, Fair value 2,986 1,992  
Available-for-sale, Total securities in a loss position, Unrealized loss $ (11) $ (4)  
Available-for-sale and Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] [Abstract]      
Number of securities in continuous loss position for more than 12 months | security 1