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Investment Securities - Unrealized Loss Positions (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
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 258 198
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 42,777 $ 31,051
Greater than or equal to 12 continuous months 82,475 60,669
Total Securities in a loss position 125,252 91,720
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (1,076) (205)
Greater than or equal to 12 continuous months (2,410) (414)
Held-to-maturity, Gross Unrealized Losses (3,486) (619)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value 329,365 212,675
Available-for-sale, greater than 12 continuous months, Fair value 43,001 40,478
Available-for-sale, Total Securities in a loss position, Fair Value 372,366 253,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (6,339) (1,465)
Available-for-sale, greater than 12 continuous months, Unrealized loss (1,889) (927)
Available-for-sale, Total Securities in a loss position, Unrealized loss (8,228) (2,392)
Marketable Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Marketable securities, less than 12 continuous months, Fair value 372,142 243,726
Marketable securities, greater than 12 continuous months, Fair value 125,476 101,147
Marketable securities, Total Securities in a loss position, Fair value 497,618 344,873
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Marketable securities, less than 12 continuous months, Unrealized loss (7,415) (1,670)
Marketable securities, greater than 12 continuous months, Unrealized loss (4,299) (1,341)
Marketable securities, Total Securities in a loss position, Unrealized loss $ (11,714) (3,011)
Number of investment securities in unrealized loss position longer than 12 months | security 61  
Number of investment securities in unrealized loss position less than 12 months | security 197  
Collateralized Mortgage Obligations [Member]    
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position less than 12 months | security 43  
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 $ 71,449 32,189
Available-for-sale, greater than 12 continuous months, Fair value 18,895 15,325
Available-for-sale, Total Securities in a loss position, Fair Value 90,344 47,514
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (1,314) (121)
Available-for-sale, greater than 12 continuous months, Unrealized loss (594) (302)
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (1,908) (423)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position longer than 12 months | security 21  
Number of investment securities in unrealized loss position less than 12 months | security 34  
SBA-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value $ 24,816 11,028
Available-for-sale, greater than 12 continuous months, Fair value 165 165
Available-for-sale, Total Securities in a loss position, Fair Value 24,981 11,193
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (277) (53)
Available-for-sale, greater than 12 continuous months, Unrealized loss (2) (2)
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (279) (55)
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 7  
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 $ 28,289 26,401
Available-for-sale, greater than 12 continuous months, Fair value 5,061 5,440
Available-for-sale, Total Securities in a loss position, Fair Value 33,350 31,841
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (473) (171)
Available-for-sale, greater than 12 continuous months, Unrealized loss (133) (77)
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (606) (248)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position longer than 12 months | security 3  
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 $ 107,801 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 107,801 69,276
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (2,693) (628)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (2,693) (628)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position longer than 12 months | security 4  
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 $ 15,955 14,230
Available-for-sale, greater than 12 continuous months, Fair value 0 0
Available-for-sale, Total Securities in a loss position, Fair Value 15,955 14,230
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (528) (194)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss (528) (194)
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 12,330 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 12,330 2,984
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (116) (5)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (116) (5)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position less than 12 months | security 5  
Privately issued CMOs    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value $ 862 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 862 1,310
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (2) (2)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (2) (2)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
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 $ 63,831 52,197
Available-for-sale, greater than 12 continuous months, Fair value 18,880 19,548
Available-for-sale, Total Securities in a loss position, Fair Value 82,711 71,745
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (920) (288)
Available-for-sale, greater than 12 continuous months, Unrealized loss (1,160) (546)
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (2,080) (834)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position longer than 12 months | security 32  
Number of investment securities in unrealized loss position less than 12 months | security 101  
Corporate bonds    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Available-for-sale, less than 12 continuous months, Fair value $ 4,032 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 4,032 3,060
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Available-for-sale, less than 12 continuous months, Unrealized loss (16) (3)
Available-for-sale, greater than 12 continuous months, Unrealized loss 0 0
Available-for-sale, Total Securities in a loss position, Unrealized loss $ (16) (3)
Marketable Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Number of investment securities in unrealized loss position less than 12 months | security 6  
Obligations of state and political subdivisions    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months $ 3,636 3,648
Greater than or equal to 12 continuous months 0 0
Total Securities in a loss position 3,636 3,648
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (20) (31)
Greater than or equal to 12 continuous months 0 0
Held-to-maturity, Gross Unrealized Losses (20) (31)
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 22,570 16,337
Greater than or equal to 12 continuous months 69,808 46,845
Total Securities in a loss position 92,378 63,182
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (611) (143)
Greater than or equal to 12 continuous months (1,888) (371)
Held-to-maturity, Gross Unrealized Losses (2,499) (514)
CMOs issued by FHLMC    
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 continuous months 16,571 11,066
Greater than or equal to 12 continuous months 12,667 13,824
Total Securities in a loss position 29,238 24,890
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 continuous months (445) (31)
Greater than or equal to 12 continuous months (522) (43)
Held-to-maturity, Gross Unrealized Losses $ (967) $ (74)