INVESTMENT SECURITIES - Contractual Final Maturity Distribution of Debt Securities Classified as Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available for Sale, Fair Value
Within One Year	$ 15,109
After One But Within Five Years	164,432
After Five But Within Ten Years	6,001
Securities not due at a Single Maturity	148,456
Total	333,998	$ 283,454
Available for Sale, Amortized Cost
Within One Year	15,091
After One But Within Five Years	165,310
After Five But Within Ten Years	5,923
Securities not due at a Single Maturity	148,522
Total	334,846	283,185
Held to Maturity, Fair Value
After Ten Years	17,935
Securities not due at a Single Maturity	67,814
Total	85,749	120,093
Held to Maturity, Amortized Cost
After Ten Years	17,849
Securities not due at a Single Maturity	67,845
Total	85,694	119,674
U.S. Treasury Obligations
Available for Sale, Fair Value
Within One Year	15,109
After One But Within Five Years	10,074
Total	25,183	25,113
Available for Sale, Amortized Cost
Within One Year	15,091
After One But Within Five Years	9,988
Total	25,079	25,064
U.S. Agency Obligations
Held to Maturity, Fair Value
After Ten Years	17,935
Total	17,935	20,570
Held to Maturity, Amortized Cost
After Ten Years	17,849
Total	17,849	20,084
U.S. GSEs
Available for Sale, Fair Value
After One But Within Five Years	93,353
Total	93,353	20,794
Available for Sale, Amortized Cost
After One But Within Five Years	93,883
Total	93,883	20,895
Held to Maturity, Fair Value
Total		9,722
Held to Maturity, Amortized Cost
Total		9,556
FHLB Obligations
Available for Sale, Fair Value
After One But Within Five Years	61,005
After Five But Within Ten Years	6,001
Total	67,006	51,111
Available for Sale, Amortized Cost
After One But Within Five Years	61,439
After Five But Within Ten Years	5,923
Total	67,362	51,230
Held to Maturity, Fair Value
Total		4,834
Held to Maturity, Amortized Cost
Total		4,758
Agency MBSs
Available for Sale, Fair Value
Securities not due at a Single Maturity	75,209
Total	75,209	97,249
Available for Sale, Amortized Cost
Securities not due at a Single Maturity	74,573
Total	74,573	96,073
Held to Maturity, Fair Value
Securities not due at a Single Maturity	5,879
Total	5,879	7,181
Held to Maturity, Amortized Cost
Securities not due at a Single Maturity	5,787
Total	5,787	7,027
Agency CMBSs
Available for Sale, Fair Value
Securities not due at a Single Maturity	23,608
Total	23,608	24,553
Available for Sale, Amortized Cost
Securities not due at a Single Maturity	23,972
Total	23,972	24,950
Agency CMOs
Available for Sale, Fair Value
Securities not due at a Single Maturity	49,333
Total	49,333	64,279
Available for Sale, Amortized Cost
Securities not due at a Single Maturity	49,694
Total	49,694	64,648
Held to Maturity, Fair Value
Securities not due at a Single Maturity	61,935
Total	61,935	77,786
Held to Maturity, Amortized Cost
Securities not due at a Single Maturity	62,058
Total	62,058	78,249
ABSs
Available for Sale, Fair Value
Securities not due at a Single Maturity	306
Total	306	355
Available for Sale, Amortized Cost
Securities not due at a Single Maturity	283
Total	$ 283	$ 325