SECURITIES (Schedule of Securities Pledged to Secure Public Deposits, Repurchase Agreements, and for Other Purposes) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Available-for-sale Securities
Schedule of Investments [Line Items]
Total pledged AFS securities, fair value		$ 342,104	$ 337,301
Available-for-sale Securities | Public deposits
Schedule of Investments [Line Items]
Total pledged AFS securities, fair value		210,546	184,635
Available-for-sale Securities | Repurchase agreements
Schedule of Investments [Line Items]
Total pledged AFS securities, fair value		108,208	126,120
Available-for-sale Securities | Other purposes
Schedule of Investments [Line Items]
Total pledged AFS securities, fair value	[1]	23,350	26,546
Held-to-maturity Securities
Schedule of Investments [Line Items]
Total pledged HTM securities, fair value		197,889	207,140
Held-to-maturity Securities | Public deposits
Schedule of Investments [Line Items]
Total pledged HTM securities, fair value		$ 197,889	$ 207,140

[1] (1) The "Other purposes" category consists of borrowings, derivatives, and accounts held at the Bank.