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Investment Securities - Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 41,567 $ 31,051
Greater than or equal to 12 continuous months 105,492 60,669
Total Securities in a loss position 147,059 91,720
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (1,285) (205)
Greater than or equal to 12 continuous months (4,991) (414)
Held-to-maturity, Gross Unrealized Losses (6,276) (619)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 270,513 212,675
Available-for-sale, greater than 12 continuous months, Fair value 78,041 40,478
Available-for-sale, Total Securities in a loss position, Fair Value 348,554 253,153
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (7,848) (1,465)
Available-for-sale, greater than 12 continuous months, Unrealized loss (3,401) (927)
Available-for-sale, Total Securities in a loss position, Unrealized loss (11,249) (2,392)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, Fair value 312,080 243,726
Marketable securities, greater than 12 continuous months, Fair value 183,533 101,147
Marketable securities, Total Securities in a loss position, Fair value 495,613 344,873
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, Unrealized loss (9,133) (1,670)
Marketable securities, greater than 12 continuous months, Unrealized loss (8,392) (1,341)
Marketable securities, Total Securities in a loss position, Unrealized loss (17,525) (3,011)
MBS pass-through securities issued by FHLMC and FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 6,602 16,337
Greater than or equal to 12 continuous months 80,360 46,845
Total Securities in a loss position 86,962 63,182
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (225) (143)
Greater than or equal to 12 continuous months (4,050) (371)
Held-to-maturity, Gross Unrealized Losses (4,275) (514)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 52,821 32,189
Available-for-sale, greater than 12 continuous months, Fair value 20,406 15,325
Available-for-sale, Total Securities in a loss position, Fair Value 73,227 47,514
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (1,804) (121)
Available-for-sale, greater than 12 continuous months, Unrealized loss (828) (302)
Available-for-sale, Total Securities in a loss position, Unrealized loss (2,632) (423)
SBA-backed securities    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 8,489  
Greater than or equal to 12 continuous months 0  
Total Securities in a loss position 8,489  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (234)  
Greater than or equal to 12 continuous months 0  
Held-to-maturity, Gross Unrealized Losses (234)  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 23,162 11,028
Available-for-sale, greater than 12 continuous months, Fair value 0 165
Available-for-sale, Total Securities in a loss position, Fair Value 23,162 11,193
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (893) (53)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 (2)
Available-for-sale, Total Securities in a loss position, Unrealized loss (893) (55)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 11,254  
Greater than or equal to 12 continuous months 0  
Total Securities in a loss position 11,254  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (392)  
Greater than or equal to 12 continuous months 0  
Held-to-maturity, Gross Unrealized Losses (392)  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 13,230 26,401
Available-for-sale, greater than 12 continuous months, Fair value 5,905 5,440
Available-for-sale, Total Securities in a loss position, Fair Value 19,135 31,841
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (383) (171)
Available-for-sale, greater than 12 continuous months, Unrealized loss (179) (77)
Available-for-sale, Total Securities in a loss position, Unrealized loss (562) (248)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 11,430 11,066
Greater than or equal to 12 continuous months 21,438 13,824
Total Securities in a loss position 32,868 24,890
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (400) (31)
Greater than or equal to 12 continuous months (901) (43)
Held-to-maturity, Gross Unrealized Losses (1,301) (74)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 87,017 69,276
Available-for-sale, greater than 12 continuous months, Fair value 29,702 0
Available-for-sale, Total Securities in a loss position, Fair Value 116,719 69,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (2,930) (628)
Available-for-sale, greater than 12 continuous months, Unrealized loss (989) 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (3,919) (628)
CMOs issued by GNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 0  
Greater than or equal to 12 continuous months 3,694  
Total Securities in a loss position 3,694  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months 0  
Greater than or equal to 12 continuous months (40)  
Held-to-maturity, Gross Unrealized Losses (40)  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 10,728 14,230
Available-for-sale, greater than 12 continuous months, Fair value 485 0
Available-for-sale, Total Securities in a loss position, Fair Value 11,213 14,230
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (485) (194)
Available-for-sale, greater than 12 continuous months, Unrealized loss (3) 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (488) (194)
Debentures of government- sponsored agencies    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 37,831 2,984
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 37,831 2,984
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (556) (5)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (556) (5)
Privately issued CMOs    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value   1,310
Available-for-sale, greater than 12 continuous months, Fair value   0
Available-for-sale, Total Securities in a loss position, Fair Value   1,310
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss   (2)
Available-for-sale, greater than 12 continuous months, Unrealized loss   0
Available-for-sale, Total Securities in a loss position, Unrealized loss   (2)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 3,792 3,648
Greater than or equal to 12 continuous months 0 0
Total Securities in a loss position 3,792 3,648
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (34) (31)
Greater than or equal to 12 continuous months 0 0
Held-to-maturity, Gross Unrealized Losses (34) (31)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 44,714 52,197
Available-for-sale, greater than 12 continuous months, Fair value 21,543 19,548
Available-for-sale, Total Securities in a loss position, Fair Value 66,257 71,745
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (785) (288)
Available-for-sale, greater than 12 continuous months, Unrealized loss (1,402) (546)
Available-for-sale, Total Securities in a loss position, Unrealized loss (2,187) (834)
Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 1,010 3,060
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 1,010 3,060
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (12) (3)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (12) $ (3)