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Investment Securities - Unrealized Loss Positions (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 66,222 $ 31,051
Greater than or equal to 12 continuous months 86,230 60,669
Total Securities in a loss position 152,452 91,720
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (1,681) (205)
Greater than or equal to 12 continuous months (3,079) (414)
Held-to-maturity, Gross Unrealized Losses (4,760) (619)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 326,092 212,675
Available-for-sale, greater than 12 continuous months, Fair value 41,790 40,478
Available-for-sale, Total Securities in a loss position, Fair Value 367,882 253,153
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (7,301) (1,465)
Available-for-sale, greater than 12 continuous months, Unrealized loss (1,962) (927)
Available-for-sale, Total Securities in a loss position, Unrealized loss (9,263) (2,392)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, Fair value 392,314 243,726
Marketable securities, greater than 12 continuous months, Fair value 128,020 101,147
Marketable securities, Total Securities in a loss position, Fair value 520,334 344,873
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, Unrealized loss (8,982) (1,670)
Marketable securities, greater than 12 continuous months, Unrealized loss (5,041) (1,341)
Marketable securities, Total Securities in a loss position, Unrealized loss (14,023) (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 22,100 16,337
Greater than or equal to 12 continuous months 68,724 46,845
Total Securities in a loss position 90,824 63,182
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (830) (143)
Greater than or equal to 12 continuous months (2,549) (371)
Held-to-maturity, Gross Unrealized Losses (3,379) (514)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 68,906 32,189
Available-for-sale, greater than 12 continuous months, Fair value 17,713 15,325
Available-for-sale, Total Securities in a loss position, Fair Value 86,619 47,514
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (1,843) (121)
Available-for-sale, greater than 12 continuous months, Unrealized loss (666) (302)
Available-for-sale, Total Securities in a loss position, Unrealized loss (2,509) (423)
SBA-backed securities    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 8,742  
Greater than or equal to 12 continuous months 0  
Total Securities in a loss position 8,742  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (139)  
Greater than or equal to 12 continuous months 0  
Held-to-maturity, Gross Unrealized Losses (139)  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 23,954 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 23,954 11,193
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (666) (53)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 (2)
Available-for-sale, Total Securities in a loss position, Unrealized loss (666) (55)
CMOs issued by FNMA    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 11,766  
Greater than or equal to 12 continuous months 0  
Total Securities in a loss position 11,766  
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (115)  
Greater than or equal to 12 continuous months 0  
Held-to-maturity, Gross Unrealized Losses (115)  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 15,687 26,401
Available-for-sale, greater than 12 continuous months, Fair value 4,642 5,440
Available-for-sale, Total Securities in a loss position, Fair Value 20,329 31,841
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (321) (171)
Available-for-sale, greater than 12 continuous months, Unrealized loss (141) (77)
Available-for-sale, Total Securities in a loss position, Unrealized loss (462) (248)
CMOs issued by FHLMC    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 19,798 11,066
Greater than or equal to 12 continuous months 13,793 13,824
Total Securities in a loss position 33,591 24,890
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (564) (31)
Greater than or equal to 12 continuous months (513) (43)
Held-to-maturity, Gross Unrealized Losses (1,077) (74)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 115,370 69,276
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 115,370 69,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (2,949) (628)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (2,949) (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 3,713  
Total Securities in a loss position 3,713  
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 (17)  
Held-to-maturity, Gross Unrealized Losses (17)  
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 11,297 14,230
Available-for-sale, greater than 12 continuous months, Fair value 603 0
Available-for-sale, Total Securities in a loss position, Fair Value 11,900 14,230
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (419) (194)
Available-for-sale, greater than 12 continuous months, Unrealized loss (2) 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (421) (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 32,139 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 32,139 2,984
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (256) (5)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (256) (5)
Privately issued CMOs    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 0 1,310
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 0 1,310
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss 0 (2)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss 0 (2)
Obligations of state and political subdivisions    
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 3,816 3,648
Greater than or equal to 12 continuous months 0 0
Total Securities in a loss position 3,816 3,648
Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (33) (31)
Greater than or equal to 12 continuous months 0 0
Held-to-maturity, Gross Unrealized Losses (33) (31)
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 57,217 52,197
Available-for-sale, greater than 12 continuous months, Fair value 18,832 19,548
Available-for-sale, Total Securities in a loss position, Fair Value 76,049 71,745
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (835) (288)
Available-for-sale, greater than 12 continuous months, Unrealized loss (1,153) (546)
Available-for-sale, Total Securities in a loss position, Unrealized loss (1,988) (834)
Corporate bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 1,522 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 1,522 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)