INVESTMENT SECURITIES - INVESTMENT CATEGORY (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available for sale
Less than 12 months Fair Value	$ 2,458	$ 190,631
Less than 12 months Unrealized Losses	(42)	(2,213)
12 months or more Fair Value	250,459	19,879
12 months or more Unrealized Losses	(2,214)	(647)
Total Fair Value	252,917	210,510
Total Unrealized Losses	$ (2,256)	$ (2,860)
Number of securities held	182	179
Number of securities held in an unrealized loss position	47	45
Held to maturity
Less than 12 months Fair Value	$ 503	$ 13,821
Less than 12 months Unrealized Losses	(1)	(126)
12 months or more Fair Value	12,006	4,937
12 months or more Unrealized Losses	(97)	(63)
Total Fair Value	12,509	18,758
Total Unrealized Losses	(98)	(189)
U.S. Treasury securities and U.S. Government agencies
Available for sale
Less than 12 months Fair Value		138,002
Less than 12 months Unrealized Losses		(1,107)
12 months or more Fair Value	183,282
12 months or more Unrealized Losses	(948)
Total Fair Value	183,282	138,002
Total Unrealized Losses	(948)	(1,107)
Held to maturity
Less than 12 months Fair Value	503	506
Less than 12 months Unrealized Losses	(1)	(2)
Total Fair Value	503	506
Total Unrealized Losses	(1)	(2)
Mortgage backed securities - residential
Available for sale
Less than 12 months Fair Value		9,427
Less than 12 months Unrealized Losses		(122)
12 months or more Fair Value	17,537	4,211
12 months or more Unrealized Losses	(226)	(98)
Total Fair Value	17,537	13,638
Total Unrealized Losses	(226)	(220)
Collateralized mortgage obligations
Available for sale
Less than 12 months Fair Value		37,547
Less than 12 months Unrealized Losses		(690)
12 months or more Fair Value	46,440	15,668
12 months or more Unrealized Losses	(780)	(549)
Total Fair Value	46,440	53,215
Total Unrealized Losses	(780)	(1,239)
Held to maturity
Less than 12 months Fair Value		13,315
Less than 12 months Unrealized Losses		(124)
12 months or more Fair Value	7,066
12 months or more Unrealized Losses	(36)
Total Fair Value	7,066	13,315
Total Unrealized Losses	(36)	(124)
Community Reinvestment Act mutual fund
Available for sale
Less than 12 months Fair Value	2,458	2,455
Less than 12 months Unrealized Losses	(42)	(45)
Total Fair Value	2,458	2,455
Total Unrealized Losses	(42)	(45)
Corporate bonds
Available for sale
Less than 12 months Fair Value		3,200
Less than 12 months Unrealized Losses		(249)
Total Fair Value		3,200
Total Unrealized Losses		(249)
Held to maturity
12 months or more Fair Value	4,940	4,937
12 months or more Unrealized Losses	(61)	(63)
Total Fair Value	4,940	4,937
Total Unrealized Losses	(61)	$ (63)
Trust preferred security
Available for sale
12 months or more Fair Value	3,200
12 months or more Unrealized Losses	(260)
Total Fair Value	3,200
Total Unrealized Losses	$ (260)
Private label mortgage backed security
Available for sale
Number of securities held	1