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Investment Securities - Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, Amortized Cost $ 151,032 $ 44,438
Held-to-maturity, Fair Value 151,032 45,097
Held-to-maturity, Gross Unrealized Gains 619 820
Held-to-maturity, Gross Unrealized (Losses) (619) (161)
Available for sale, Amortized Cost 334,285 378,254
Available-for-sale, at fair value 332,467 372,580
Available-for-sale, Gross Unrealized Gains 574 575
Available-for-sale, Gross Unrealized (Losses) (2,392) (6,249)
Total investment securities, Amortized Cost 485,317 422,692
Total investment securities, Fair Value 483,499 417,677
Total investment securities, Gross Unrealized Gains 1,193 1,395
Total investment securities, Gross Unrealized (Losses) (3,011) (6,410)
MBS pass-through securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available for sale, Amortized Cost 65,559 193,384
Available-for-sale, at fair value 65,262 189,959
Available-for-sale, Gross Unrealized Gains 126 145
Available-for-sale, Gross Unrealized (Losses) (423) (3,570)
SBA-backed securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available for sale, Amortized Cost 25,979 614
Available-for-sale, at fair value 25,982 607
Available-for-sale, Gross Unrealized Gains 58 0
Available-for-sale, Gross Unrealized (Losses) (55) (7)
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available for sale, Amortized Cost 35,340 13,790
Available-for-sale, at fair value 35,125 13,772
Available-for-sale, Gross Unrealized Gains 33 91
Available-for-sale, Gross Unrealized (Losses) (248) (109)
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available for sale, Amortized Cost 70,514 43,452
Available-for-sale, at fair value 69,889 42,758
Available-for-sale, Gross Unrealized Gains 3 37
Available-for-sale, Gross Unrealized (Losses) (628) (731)
CMOs issued by GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available for sale, Amortized Cost 17,953 6,844
Available-for-sale, at fair value 17,785 6,945
Available-for-sale, Gross Unrealized Gains 26 102
Available-for-sale, Gross Unrealized (Losses) (194) (1)
Debentures of government- sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available for sale, Amortized Cost 12,940 35,486
Available-for-sale, at fair value 12,938 35,403
Available-for-sale, Gross Unrealized Gains 3 7
Available-for-sale, Gross Unrealized (Losses) (5) (90)
Privately issued CMOs    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Available for sale, Amortized Cost 1,432 419
Available-for-sale, at fair value 1,431 419
Available-for-sale, Gross Unrealized Gains 1 1
Available-for-sale, Gross Unrealized (Losses) (2) (1)
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, Amortized Cost 19,646 30,856
Held-to-maturity, Fair Value 19,998 31,544
Held-to-maturity, Gross Unrealized Gains 383 694
Held-to-maturity, Gross Unrealized (Losses) (31) (6)
Available for sale, Amortized Cost 98,027 79,306
Available-for-sale, at fair value 97,491 77,701
Available-for-sale, Gross Unrealized Gains 298 135
Available-for-sale, Gross Unrealized (Losses) (834) (1,740)
Corporate bonds    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, Amortized Cost 0 3,519
Held-to-maturity, Fair Value 0 3,518
Held-to-maturity, Gross Unrealized Gains 0 0
Held-to-maturity, Gross Unrealized (Losses) 0 (1)
Available for sale, Amortized Cost 6,541 4,959
Available-for-sale, at fair value 6,564 5,016
Available-for-sale, Gross Unrealized Gains 26 57
Available-for-sale, Gross Unrealized (Losses) (3) 0
MBS pass-through securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, Amortized Cost 100,376 10,063
Held-to-maturity, Fair Value 100,096 10,035
Held-to-maturity, Gross Unrealized Gains 234 126
Held-to-maturity, Gross Unrealized (Losses) (514) (154)
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, Amortized Cost 31,010 0
Held-to-maturity, Fair Value 30,938 0
Held-to-maturity, Gross Unrealized Gains 2 0
Held-to-maturity, Gross Unrealized (Losses) $ (74) $ 0