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Investment Securities - Investment Securities in Unrealized Loss Positions (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
security
Investments, Debt and Equity Securities [Abstract]    
Number of investment securities other-than-temporarily impaired | security 0  
Number of investment securities in unrealized loss position | security 67 134
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 17,764 $ 9,130
Greater than or equal to 12 continuous months 33,006 0
Total Securities in a loss position 50,770 9,130
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (115) (161)
Greater than or equal to 12 continuous months (33) 0
Held-to-maturity, Gross Unrealized Losses (148) (161)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 75,503 284,314
Available-for-sale, greater than 12 continuous months, Fair value 30,284 9,946
Available-for-sale, Total Securities in a loss position, Fair Value 105,787 294,260
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (438) (6,197)
Available-for-sale, greater than 12 continuous months, Unrealized loss (415) (52)
Available-for-sale, Total Securities in a loss position, Unrealized loss (853) (6,249)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, Fair value 93,267 293,444
Marketable securities, greater than 12 continuous months, Fair value 63,290 9,946
Marketable securities, Total Securities in a loss position, Fair value 156,557 303,390
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, Unrealized loss (553) (6,358)
Marketable securities, greater than 12 continuous months, Unrealized loss (448) (52)
Marketable securities, Total Securities in a loss position, Unrealized loss $ (1,001) (6,410)
Number of investment securities in unrealized loss position less than 12 months | security 30  
MBS pass-through securities issued by FHLMC and FNMA    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value $ 21,619 162,016
Available-for-sale, greater than 12 continuous months, Fair value 2,321 0
Available-for-sale, Total Securities in a loss position, Fair Value 23,940 162,016
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (229) (3,577)
Available-for-sale, greater than 12 continuous months, Unrealized loss (10) 0
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (239) (3,577)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position longer than 12 months | security 5  
Number of investment securities in unrealized loss position less than 12 months | security 12  
CMOs issued by FNMA    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value $ 8,005 9,498
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 8,005 9,498
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (43) (109)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (43) (109)
CMOs issued by FHLMC    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 15,014 31,545
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 15,014 31,545
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (13) (731)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (13) (731)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position longer than 12 months | security 1  
CMOs issued by GNMA    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value $ 4,807 1,583
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 4,807 1,583
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (51) (1)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (51) (1)
Debentures of government- sponsored agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 19,929 19,951
Available-for-sale, greater than 12 continuous months, Fair value 9,953 9,946
Available-for-sale, Total Securities in a loss position, Fair Value 29,882 29,897
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (64) (38)
Available-for-sale, greater than 12 continuous months, Unrealized loss (46) (52)
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (110) (90)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position longer than 12 months | security 1  
Number of investment securities in unrealized loss position less than 12 months | security 1  
Obligations of state and political subdivisions    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value $ 6,129 59,567
Available-for-sale, greater than 12 continuous months, Fair value 18,010 0
Available-for-sale, Total Securities in a loss position, Fair Value 24,139 59,567
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (38) (1,740)
Available-for-sale, greater than 12 continuous months, Unrealized loss (359) 0
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (397) (1,740)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position longer than 12 months | security 30  
Number of investment securities in unrealized loss position less than 12 months | security 8  
Corporate bonds    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value   154
Available-for-sale, greater than 12 continuous months, Fair value   0
Available-for-sale, Total Securities in a loss position, Fair Value   154
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss   (1)
Available-for-sale, greater than 12 continuous months, Unrealized loss   0
Available-for-sale, Total Securities in a loss position, Unrealized loss   (1)
Privately-issued collateralized mortgage obligations    
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position less than 12 months | security 9  
Obligations of state and political subdivisions    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months   2,250
Greater than or equal to 12 continuous months   0
Total Securities in a loss position   2,250
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months   (154)
Greater than or equal to 12 continuous months   0
Held-to-maturity, Gross Unrealized Losses   (154)
Corporate bonds    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months   3,362
Greater than or equal to 12 continuous months   0
Total Securities in a loss position   3,362
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months   (6)
Greater than or equal to 12 continuous months   0
Held-to-maturity, Gross Unrealized Losses   (6)
MBS pass-through securities issued by FHLMC and FNMA    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 17,764 3,518
Greater than or equal to 12 continuous months 31,501 0
Total Securities in a loss position 49,265 3,518
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (115) (1)
Greater than or equal to 12 continuous months (30) 0
Held-to-maturity, Gross Unrealized Losses (145) $ (1)
CMOs issued by FHLMC    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 0  
Greater than or equal to 12 continuous months 1,505  
Total Securities in a loss position 1,505  
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months 0  
Greater than or equal to 12 continuous months $ (3)