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Investment Securities - Investment Securities in Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
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 106 134
Held-to-maturity, less than 12 continuous months, Fair value $ 109,630 $ 9,130
Held-to-maturity, less than 12 continuous months, Unrealized loss (677) (161)
Held-to-maturity, greater than 12 continuous months, Fair value 545 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss (2) 0
Held-to-maturity, Total Securities in a loss position, Fair value 110,175 9,130
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (679) (161)
Held-to-maturity, Gross Unrealized Losses (679) (161)
Available-for-sale, less than 12 continuous months, Fair value 123,229 284,314
Available-for-sale, less than 12 continuous months, Unrealized loss (1,743) (6,197)
Available-for-sale, greater than 12 continuous months, Fair value 9,945 9,946
Available-for-sale, greater than 12 continuous months, Unrealized loss (54) (52)
Available-for-sale, Total Securities in a loss position, Fair Value 133,174 294,260
Available-for-sale, Total Securities in a loss position, Unrealized loss (1,797) (6,249)
Marketable securities, less than 12 continuous months, Fair value 232,859 293,444
Marketable securities, less than 12 continuous months, Unrealized loss (2,420) (6,358)
Marketable securities, greater than 12 continuous months, Fair value 10,490 9,946
Marketable securities, greater than 12 continuous months, Unrealized loss (56) (52)
Marketable securities, Total Securities in a loss position, Fair value 243,349 303,390
Marketable securities, Total Securities in a loss position, Unrealized loss $ (2,476) (6,410)
Number of investment securities in unrealized loss position less than 12 months | security 104  
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 $ 45,048 162,016
Available-for-sale, less than 12 continuous months, Unrealized loss (285) (3,577)
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 45,048 162,016
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (285) (3,577)
Number of investment securities in unrealized loss position less than 12 months | security 28  
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 $ 8,866 9,498
Available-for-sale, less than 12 continuous months, Unrealized loss (107) (109)
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 8,866 9,498
Available-for-sale, Total Securities in a loss position, Unrealized loss (107) (109)
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 6,553 31,545
Available-for-sale, less than 12 continuous months, Unrealized loss (2) (731)
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 6,553 31,545
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (2) (731)
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   1,583
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   1,583
Available-for-sale, Total Securities in a loss position, Unrealized loss   (1)
Debentures of government- sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Marketable Securities In Unrealized Loss Positions, Qualitative Disclosure, Number Of Positions, Longer Than 12 Months | security 1  
Available-for-sale, less than 12 continuous months, Fair value $ 19,940 19,951
Available-for-sale, less than 12 continuous months, Unrealized loss (50) (38)
Available-for-sale, greater than 12 continuous months, Fair value 9,945 9,946
Available-for-sale, greater than 12 continuous months, Unrealized loss (54) (52)
Available-for-sale, Total Securities in a loss position, Fair Value 29,885 29,897
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (104) (90)
Number of investment securities in unrealized loss position less than 12 months | security 1  
Privately issued CMOs    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Number of investment securities in unrealized loss position less than 12 months | security 8  
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Marketable Securities In Unrealized Loss Positions, Qualitative Disclosure, Number Of Positions, Longer Than 12 Months | security 1  
Available-for-sale, less than 12 continuous months, Fair value $ 41,822 59,567
Available-for-sale, less than 12 continuous months, Unrealized loss (1,299) (1,740)
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 41,822 59,567
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (1,299) (1,740)
Number of investment securities in unrealized loss position less than 12 months | security 65  
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 $ 1,000 154
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (1)
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 1,000 154
Available-for-sale, Total Securities in a loss position, Unrealized loss $ 0 (1)
Number of investment securities in unrealized loss position less than 12 months | security 2  
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 $ 1,493 2,250
Held-to-maturity, less than 12 continuous months, Unrealized loss (1) (154)
Held-to-maturity, greater than 12 continuous months, Fair value 545 0
Held-to-maturity, greater than 12 continuous months, Unrealized loss (2) 0
Held-to-maturity, Total Securities in a loss position, Fair value 2,038 2,250
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (3) (6)
Held-to-maturity, Gross Unrealized Losses (3) (154)
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 3,512 3,362
Held-to-maturity, less than 12 continuous months, Unrealized loss (3) (6)
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 3,512 3,362
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (3) (1)
Held-to-maturity, Gross Unrealized Losses (3) (6)
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 93,021 3,518
Held-to-maturity, less than 12 continuous months, Unrealized loss (623) (1)
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 93,021 3,518
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (623) (154)
Held-to-maturity, Gross Unrealized Losses   (1)
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held-to-maturity, less than 12 continuous months, Fair value 11,604  
Held-to-maturity, less than 12 continuous months, Unrealized loss (50)  
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 11,604  
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss $ (50) $ 0