Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES (Schedule of Securities Pledged as Collateral) (Details)

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COMMITMENTS AND CONTINGENCIES (Schedule of Securities Pledged as Collateral) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 13,372 $ 23,870
Loans 2,696,674 2,390,509
Total pledged assets 3,254,901 2,951,852
AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 537,398 339,991
HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 7,457 197,482
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 445,102 439,954
Public deposits | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 437,645 242,472
Public deposits | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 7,457 197,482
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 71,142 77,942
Repurchase agreements | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 71,142 77,942
Repurchase agreements | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
FHLB advances    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 2,696,674 2,390,509
Total pledged assets 2,697,280 2,391,387
FHLB advances | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 606 878
FHLB advances | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Derivatives    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 13,372 23,870
Loans 0 0
Total pledged assets 15,955 27,526
Derivatives | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 2,583 3,656
Derivatives | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 0 0
Other purposes    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 25,422 15,043
Other purposes | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 25,422 15,043
Other purposes | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 0 $ 0