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
Sep. 30, 2018
Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash $ 13,436 $ 23,870
Loans 3,250,648 2,390,509
Total pledged assets 3,781,338 2,951,852
AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 509,887 339,991
HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 7,367 197,482
Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 422,107 439,954
Public deposits | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 414,740 242,472
Public deposits | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 7,367 197,482
Repurchase agreements    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Cash 0 0
Loans 0 0
Total pledged assets 68,229 77,942
Repurchase agreements | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 68,229 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 3,250,648 2,390,509
Total pledged assets 3,251,194 2,391,387
FHLB advances | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 546 878
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 13,436 23,870
Loans 0 0
Total pledged assets 15,611 27,526
Derivatives | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 2,175 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 24,197 15,043
Other purposes | AFS Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged 24,197 15,043
Other purposes | HTM Securities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged $ 0 $ 0