SECURITIES - Securities Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	$ 257,751	$ 297,947
Unrealized Gains	84	514
Unrealized Losses	11,362	5,370
Estimated Fair Value	246,473	293,091
Amortized Cost [Abstract]
Within one year	16,284
After one, but within five years	15,932
After five, but within ten years	24,580
After ten years	484
Total	57,280
Amortized Cost	257,751	297,947
Fair Value [Abstract]
Within one year	16,241
After one, but within five years	15,728
After five, but within ten years	23,831
After ten years	448
Total	56,248
Estimated Fair Value	246,473	293,091
Obligations of U.S. Government and U.S. Government sponsored enterprises
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	10,487	15,492
Unrealized Gains	8	20
Unrealized Losses	42	21
Estimated Fair Value	10,453	15,491
Amortized Cost [Abstract]
Amortized Cost	10,487	15,492
Fair Value [Abstract]
Estimated Fair Value	10,453	15,491
Mortgage-backed securities, residential
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	196,977	224,939
Unrealized Gains	58	136
Unrealized Losses	10,258	5,166
Estimated Fair Value	186,777	219,909
Amortized Cost [Abstract]
Without single maturity date	196,977
Amortized Cost	196,977	224,939
Fair Value [Abstract]
Without single maturity date	186,777
Estimated Fair Value	186,777	219,909
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	46,544	52,928
Unrealized Gains	17	355
Unrealized Losses	1,016	151
Estimated Fair Value	45,545	53,132
Amortized Cost [Abstract]
Amortized Cost	46,544	52,928
Fair Value [Abstract]
Estimated Fair Value	45,545	53,132
Corporate bonds and notes
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	249	249
Unrealized Gains	1	2
Unrealized Losses	0	0
Estimated Fair Value	250	251
Amortized Cost [Abstract]
Amortized Cost	249	249
Fair Value [Abstract]
Estimated Fair Value	250	251
SBA loan pools
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	3,494	4,339
Unrealized Gains	0	1
Unrealized Losses	46	32
Estimated Fair Value	3,448	4,308
Amortized Cost [Abstract]
Without single maturity date	3,494
Amortized Cost	3,494	4,339
Fair Value [Abstract]
Without single maturity date	3,448
Estimated Fair Value	$ 3,448	$ 4,308

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.