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GOODWILL AND OTHER INTANGIBLES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Feb. 15, 2016	Jun. 30, 2012
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 28,100		$ 28,100		$ 28,100
Amortization expense			1,551	$ 1,868
Net carrying amount	3,900		3,900		4,300
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	51,664		51,664		51,664
Amortization expense	200	$ 200	400	600
Net carrying amount	3,903		$ 3,903		$ 4,335
Remaining amortization period			5 years 7 months 6 days		6 years
Customer Relationships [Member] | Credit Card [Member]
Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	24,465		$ 24,465		$ 24,465		$ 24,500
Amortization expense	500	600	1,000	1,100
Net carrying amount	4,659		$ 4,659		$ 5,702
Remaining amortization period			2 years 4 months 24 days		2 years 10 months 24 days
Customer Relationships [Member] | Insurance Customer Intangible [Member]
Finite Lived Intangible Assets [Line Items]
Finite Lived Intangible Assets Gross	1,067		$ 1,067		$ 1,067
Amortization expense	38	$ 38	76	$ 76
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles						$ 1,100
Net carrying amount	$ 546		$ 546		$ 622
Remaining amortization period			3 years 6 months		4 years

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